Re: [sympy] Addition of 'BigInteger' to Numbers
On Wednesday, March 5, 2014 5:08:47 AM UTC+4, Ondřej Čertík wrote: Can you post your code where you need large integers in Python that runs out of memory? A good example is this one: http://code.google.com/p/sympy/issues/detail?id=3736 :) But I think it's a very different (and very difficult!) problem (mostly related with rules of evaluation for sympy's objects. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/26bc3365-0553-4653-a432-6dc3a7c6f887%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
That one appears to be an mpmath problem, rather than a Sympy problem (specifically). Even if Sympy had a BigInteger support, that wouldn't fix this problem as it fails in mpmath code (which doesn't use any Sympy classes). I'd like to know of any examples of large integers that Sympy doesn't support. Cheers, Tim. On 2014-03-05, at 8:30 AM, Sergey Kirpichev skirpic...@gmail.com wrote: On Wednesday, March 5, 2014 5:08:47 AM UTC+4, Ondřej Čertík wrote: Can you post your code where you need large integers in Python that runs out of memory? A good example is this one: http://code.google.com/p/sympy/issues/detail?id=3736 :) But I think it's a very different (and very difficult!) problem (mostly related with rules of evaluation for sympy's objects. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/26bc3365-0553-4653-a432-6dc3a7c6f887%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/2FCB035D-F50C-4308-AD9B-9B314F548A56%40gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
On Wed, Mar 05, 2014 at 09:45:55AM -0500, Tim Lahey wrote: That one appears to be an mpmath problem, rather than a Sympy problem (specifically). Even if Sympy had a BigInteger support, that wouldn't fix this problem as it fails in mpmath code (which doesn't use any Sympy classes). I'd like to know of any examples of large integers that Sympy doesn't support. Just change in the above example E and floats to some rounded values. In [1]: 2**2**2**2**7 --- MemoryError Traceback (most recent call last) ipython-input-1-22f2c4609245 in module() 1 2**2**2**2**7 MemoryError: (isympy was under ulimit -v 1048576) -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/20140305151255.GB23903%40darkstar.order.hcn-strela.ru. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
That issue is about dealing with numbers like googolplex, which are too big to be represented by any computer (even a computer the size of the universe). The solution is to keep things unevaluated. A googolplex is representable, as 10**10**100. It just needs to be kept from evaluating. This is a problem in SymPy that *hasn't* been solved. There are suggestions on the issue on how to do so. Once you implements unevaluated big numbers, it might be fun to implement Knuth up arrow notation on them. Aaron Meurer On Mar 5, 2014, at 8:46 AM, Tim Lahey tim.la...@gmail.com wrote: That one appears to be an mpmath problem, rather than a Sympy problem (specifically). Even if Sympy had a BigInteger support, that wouldn't fix this problem as it fails in mpmath code (which doesn't use any Sympy classes). I'd like to know of any examples of large integers that Sympy doesn't support. Cheers, Tim. On 2014-03-05, at 8:30 AM, Sergey Kirpichev skirpic...@gmail.com wrote: On Wednesday, March 5, 2014 5:08:47 AM UTC+4, Ondřej Čertík wrote: Can you post your code where you need large integers in Python that runs out of memory? A good example is this one: http://code.google.com/p/sympy/issues/detail?id=3736 :) But I think it's a very different (and very difficult!) problem (mostly related with rules of evaluation for sympy's objects. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/26bc3365-0553-4653-a432-6dc3a7c6f887%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/2FCB035D-F50C-4308-AD9B-9B314F548A56%40gmail.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/-5371055096513839258%40unknownmsgid. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
On Wed, Mar 5, 2014 at 8:13 AM, Aaron Meurer asmeu...@gmail.com wrote: That issue is about dealing with numbers like googolplex, which are too big to be represented by any computer (even a computer the size of the universe). The solution is to keep things unevaluated. A googolplex is representable, as 10**10**100. It just needs to be kept from evaluating. This is a problem in SymPy that *hasn't* been solved. There are suggestions on the issue on how to do so. Right, that's a good point. Ondrej Once you implements unevaluated big numbers, it might be fun to implement Knuth up arrow notation on them. Aaron Meurer On Mar 5, 2014, at 8:46 AM, Tim Lahey tim.la...@gmail.com wrote: That one appears to be an mpmath problem, rather than a Sympy problem (specifically). Even if Sympy had a BigInteger support, that wouldn't fix this problem as it fails in mpmath code (which doesn't use any Sympy classes). I'd like to know of any examples of large integers that Sympy doesn't support. Cheers, Tim. On 2014-03-05, at 8:30 AM, Sergey Kirpichev skirpic...@gmail.com wrote: On Wednesday, March 5, 2014 5:08:47 AM UTC+4, Ondřej Čertík wrote: Can you post your code where you need large integers in Python that runs out of memory? A good example is this one: http://code.google.com/p/sympy/issues/detail?id=3736 :) But I think it's a very different (and very difficult!) problem (mostly related with rules of evaluation for sympy's objects. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/26bc3365-0553-4653-a432-6dc3a7c6f887%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/2FCB035D-F50C-4308-AD9B-9B314F548A56%40gmail.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/-5371055096513839258%40unknownmsgid. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CADDwiVAWc5QirzPggMD2a5%3DUAx5cdL%3DBKSi2qn1fzSOXhFL6aw%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
Hi, Is there integers that Sympy can't represent? The Integer class is independent of python int. What would this module add to Sympy? Alternatively, should it be part of Numpy instead, if it's just numerics? I'm just a bit unclear on what you want to do. Cheers, Tim. On 4 Mar 2014, at 18:59, Ambar Mehrotra wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/DD610FA1-1960-4E82-8F27-6A695DE6D480%40gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
On Tue, Mar 4, 2014 at 4:59 PM, Ambar Mehrotra ambar.pri...@gmail.com wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. SymPy can also use GMP through gmpy through mpmath, so that should be able to handle any large integers. Can you post your code where you need large integers in Python that runs out of memory? Ondrej with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CADDwiVAA-XSEt5Ow0HmX%3DP6H0-pX0n_r4CKc6yOEjawqO3YW4Q%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
@Tim Even in python an integer is automatically converted to long type but it cannot go further. And as sympy has a numbers class for other data types as well this can also be included. Wanted to build something similar to this http://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html. On Wednesday, 5 March 2014 06:38:47 UTC+5:30, Ondřej Čertík wrote: On Tue, Mar 4, 2014 at 4:59 PM, Ambar Mehrotra ambar@gmail.comjavascript: wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. SymPy can also use GMP through gmpy through mpmath, so that should be able to handle any large integers. Can you post your code where you need large integers in Python that runs out of memory? Ondrej with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+un...@googlegroups.com javascript:. To post to this group, send email to sy...@googlegroups.comjavascript:. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7312fed9-2752-4de0-a9c1-9ddbd8b08767%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
Hi, Sympy's Integer class is not the same as a python int. Is there something that the Integer class or gmpy through mpmath can't do? Cheers, Tim. On 4 Mar 2014, at 20:37, Ambar Mehrotra wrote: @Tim Even in python an integer is automatically converted to long type but it cannot go further. And as sympy has a numbers class for other data types as well this can also be included. Wanted to build something similar to this http://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html. On Wednesday, 5 March 2014 06:38:47 UTC+5:30, Ondřej Čertík wrote: On Tue, Mar 4, 2014 at 4:59 PM, Ambar Mehrotra ambar@gmail.comjavascript: wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. SymPy can also use GMP through gmpy through mpmath, so that should be able to handle any large integers. Can you post your code where you need large integers in Python that runs out of memory? Ondrej with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+un...@googlegroups.com javascript:. To post to this group, send email to sy...@googlegroups.comjavascript:. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7312fed9-2752-4de0-a9c1-9ddbd8b08767%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/36D3C790-11CC-449D-BB38-29FED3287B6A%40gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
@certik, I don't have the code with me now as this incident is more than an year old. I want to implement it in various other functions for huge calculations which are native to sympy and do not require any external libraries to be installed. Since sympy has a numbers class this could make for a good addition to it. On Wednesday, 5 March 2014 06:38:47 UTC+5:30, Ondřej Čertík wrote: On Tue, Mar 4, 2014 at 4:59 PM, Ambar Mehrotra ambar@gmail.comjavascript: wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. SymPy can also use GMP through gmpy through mpmath, so that should be able to handle any large integers. Can you post your code where you need large integers in Python that runs out of memory? Ondrej with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+un...@googlegroups.com javascript:. To post to this group, send email to sy...@googlegroups.comjavascript:. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/a4532a04-24c8-4047-966e-ea250f880448%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
@Tim, This link http://docs.sympy.org/latest/tutorial/manipulation.html says that SymPy's Integer class is similar to python's built-in int type. It just plays well with other sympy classes. Gmpy is currently not supported on google app engine so I presume it will have issues working with sympy live. Plus the point is creating something that is native to sympy rather than using other libraries, both because sympy already has a class for various data types and people use sympy a lot for calculations. On Wednesday, 5 March 2014 06:36:51 UTC+5:30, Tim Lahey wrote: Hi, Is there integers that Sympy can't represent? The Integer class is independent of python int. What would this module add to Sympy? Alternatively, should it be part of Numpy instead, if it's just numerics? I'm just a bit unclear on what you want to do. Cheers, Tim. On 4 Mar 2014, at 18:59, Ambar Mehrotra wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+un...@googlegroups.com javascript:. To post to this group, send email to sy...@googlegroups.comjavascript:. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/cc383ace-4523-40be-9213-e00b347e2239%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
Well NumPy is an external library. SymPy numbers exist so that they play well with the rest of the SymPy objects, and also so that division results in rational numbers, which are not natively supported in Python. I'm not convinced that Python's native int/long is inefficient, and I'm *really* not convinced that you could do better in pure Python (even with NumPy). And there's no way you can do as good as GMP, because that's the gold standard. But please prove me wrong. I haven't stressed Python's big integers to the point of memory error before. Aaron Meurer On Tue, Mar 4, 2014 at 7:53 PM, Ambar Mehrotra ambar.pri...@gmail.com wrote: @certik, I don't have the code with me now as this incident is more than an year old. I want to implement it in various other functions for huge calculations which are native to sympy and do not require any external libraries to be installed. Since sympy has a numbers class this could make for a good addition to it. On Wednesday, 5 March 2014 06:38:47 UTC+5:30, Ondřej Čertík wrote: On Tue, Mar 4, 2014 at 4:59 PM, Ambar Mehrotra ambar@gmail.com wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. SymPy can also use GMP through gmpy through mpmath, so that should be able to handle any large integers. Can you post your code where you need large integers in Python that runs out of memory? Ondrej with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+un...@googlegroups.com. To post to this group, send email to sy...@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/a4532a04-24c8-4047-966e-ea250f880448%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6%2BGBZtkq7x%2Bzqd2%2BJeCb0Ny4W_xwTgD9RYOGfPmDX6p5w%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
Hi, I just tried the following in Sympy Live, a = Integer(10e300) a*a 1000105009520510408843254158786618710055633864690265631839011071418455537580482111259090046290613807821571488690140306370268878101524273777500358850838160825508142631371503543452789490974534195024707673633928999328085912958813715689402882445036060400419021562076363830273198436141062593970981076768615643036044297117131064842264303380707112317287679887092073518969577415226169300743617466725838681703953780178047441856281023622246186808454593221547298621359043682101570083702480343443680493585115727808066223112657792291096692290065050262017374722703449186126799737068530992997728256 It looks like it supports large integers. Cheers, Tim. On 4 Mar 2014, at 21:06, Ambar Mehrotra wrote: @Tim, This link http://docs.sympy.org/latest/tutorial/manipulation.html says that SymPy's Integer class is similar to python's built-in int type. It just plays well with other sympy classes. Gmpy is currently not supported on google app engine so I presume it will have issues working with sympy live. Plus the point is creating something that is native to sympy rather than using other libraries, both because sympy already has a class for various data types and people use sympy a lot for calculations. On Wednesday, 5 March 2014 06:36:51 UTC+5:30, Tim Lahey wrote: Hi, Is there integers that Sympy can't represent? The Integer class is independent of python int. What would this module add to Sympy? Alternatively, should it be part of Numpy instead, if it's just numerics? I'm just a bit unclear on what you want to do. Cheers, Tim. On 4 Mar 2014, at 18:59, Ambar Mehrotra wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+un...@googlegroups.com javascript:. To post to this group, send email to sy...@googlegroups.comjavascript:. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/cc383ace-4523-40be-9213-e00b347e2239%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/86999404-7909-434B-8D34-C047D480F50C%40gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
@Tim, Well seems like the idea was a bugger :p On Wednesday, 5 March 2014 06:36:51 UTC+5:30, Tim Lahey wrote: Hi, Is there integers that Sympy can't represent? The Integer class is independent of python int. What would this module add to Sympy? Alternatively, should it be part of Numpy instead, if it's just numerics? I'm just a bit unclear on what you want to do. Cheers, Tim. On 4 Mar 2014, at 18:59, Ambar Mehrotra wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please tell me if this idea is worth considering and guide me further if you like it. with regards, Ambar Mehrotra. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+un...@googlegroups.com javascript:. To post to this group, send email to sy...@googlegroups.comjavascript:. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/7ec24c8c-02d0-4e02-afb4-ca35a75207f5%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups sympy group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/fe36adbd-f999-4e78-a74e-07f21838354f%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sympy] Addition of 'BigInteger' to Numbers
On Tue, Mar 4, 2014 at 6:37 PM, Ambar Mehrotra ambar.pri...@gmail.com wrote: @Tim Even in python an integer is automatically converted to long type but it cannot go further. And as sympy has a numbers class for other data types as You might be misunderstanding how Python integers work. Your BigInteger class is just Python int. E.g., in pure Python: 2**100 1267650600228229401496703205376L 2**1000 10715086071862673209484250490600018105614048117055336074437503883703510511249361224931983788156958581275946729175531468251871452856923140435984577574698574803934567774824230985421074605062371141877954182153046474983581941267398767559165543946077062914571196477686542167660429831652624386837205668069376L 2**1 1995063116880758384883742162683585083823496831886192454852008949852943883022194663191996168403619459789933112942320912427155649134941378111759378593209632395785573004679379452676524655126605989552055008691819331154250860846061810468550907486608962488809048989483800925394163325785062156830947390255691238806522509664387444104675987162698545322286853816169431577562964076283688076073222853509164147618395638145896946389941084096053626782106462142794036525565649530603142680234969400335934316651459297773279665775606172582031407994198179607378245683762280037302885487251900834464581454650557929601414833921615734588139257095379769119277800826957735671230620187578363255027283237892707103738028663930314281332414016241956716905740614196543423246388012488561473052074319922596117962501309928602417083408076059323201612684922884962558413128440615367389514871142563151110897455142033138202029316409575964647560104058458415660720449628670165150619206310041864222759086709005746064178569519114560550682512504060075198422618980592371180578807290639524254833922198270740447316237676084661303377870603980341319713349365462270056316993745550824178097281098329131440357187752476850985727693792643322159939987688666080836883783802764328277517227365757274478411229438973381086160742325329197481312019760417828196569747589816453125843413595986278413012818540628347664908869052104758088261582396198577012240704433058307586903931960460340497315658320867210591330090375282341553974539439771525745529051021231094732161075347482574077527398634829849834075693795564663862187456949927901657210370136443313581721431179139822298384584733444027096418285100507292774836455057863450110085298781238947392869954083434615880704395911898581514577917714361969872813145948378320208147498217185801138907122825090582681743622057747592141765371568772561490458290499246102863008153558330813010198767585623434353895540917562340084488752616264356864883351946372037729324009445624692325435040067802727383775537640672689863624103749141096671855705075909810024678988017827192595338128242195402830275940844895501467666838969799688624163631337639390337345580140763674187771105538422573949911018646821969658165148513049422236994771476306915546821768287620036277725772378136533161119681128079266948188720129864366076855163986053460229787155751794738524636944692308789426594821700805112032236549628816903573912136833839359175641873385051097027161391543959099159815465441733631165693603112224993796226781732358023111862644575299135758175008199839236284615249881088960232244362173771618086357015468484058622329792853875623486556440536962622018963571028812361567512543338303270029097668650568557157505516727518899194129711337690149916181315171544007728650573189557450920330185304847113818315407324053319038462084036421763703911550639789000742853672196280903477974533320468368795868580237952218629120080742819551317948157624448298518461509704888027274721574688131594750409732115080498190455803416826949787141316063210686391511681774304792596709376L etc. Yes, Python ints are not as optimized as GMP for large integers, but it shouldn't run out of memory or have other issues. It is just slower, though usually fast enough for most applications. If this speed really matters to you, then use gmpy with sympy and you are all set. Ondrej well this can also be included. Wanted to build something similar to this http://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html. On Wednesday, 5 March 2014 06:38:47 UTC+5:30, Ondřej Čertík wrote: On Tue, Mar 4, 2014 at 4:59 PM, Ambar Mehrotra ambar@gmail.com wrote: Hi, I am Ambar Mehrotra and undergraduate from BITS Pilani, India pursuing Information Systems. I like to play with numbers and have a descent experience with python. I would like to suggest the addition of a 'BigInteger' module in the sympy.core.numbers class. Currently there is no convenient way of storing and working with very large numbers in python. I came across this problem while solving a question of Google Code Jam where python ran out of memory while doing a long calculation. I would like to take user input in form of a string and then use algorithms to do some basic math operations using numpy to make things faster. Please
