Re: [Numpy-discussion] List Array References?
Hi Alexander On Thu, Feb 14, 2008 at 03:43:46PM -0500, Alexander Michael wrote: Is there a way to list all of the arrays that are referencing a given array? Similarly, is there a way to get a list of all arrays that are currently in memory? As far as I know, the reference count to the array is increased when you create a view, but the views themselves are not tracked anywhere. You can therefore say whether there are references around, but you cannot identify the Python objects. I'm curious why you need this information -- maybe there is an alternative solution to your problem? Regards Stéfan ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] List Array References?
On Thu, Feb 14, 2008 at 8:43 PM, Alexander Michael [EMAIL PROTECTED] wrote: Is there a way to list all of the arrays that are referencing a given array? Similarly, is there a way to get a list of all arrays that are currently in memory? For the second question, if you are working interactively in Ipython, you can do %who ndarray or %whos ndarray to get a list of arrays. It might be possible to get this functionality within a script/program through the ipython api, but I'm afraid I don't know much about that. Cheers, Robin ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] List Array References?
Whith standard Python: who() Robin ha scritto: On Thu, Feb 14, 2008 at 8:43 PM, Alexander Michael [EMAIL PROTECTED] wrote: Is there a way to list all of the arrays that are referencing a given array? Similarly, is there a way to get a list of all arrays that are currently in memory? For the second question, if you are working interactively in Ipython, you can do %who ndarray or %whos ndarray to get a list of arrays. It might be possible to get this functionality within a script/program through the ipython api, but I'm afraid I don't know much about that. Cheers, Robin ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] List Array References?
On Fri, Feb 15, 2008 at 08:28:08AM -0500, Alexander Michael wrote: On Fri, Feb 15, 2008 at 7:12 AM, Stefan van der Walt [EMAIL PROTECTED] wrote: As far as I know, the reference count to the array is increased when you create a view, but the views themselves are not tracked anywhere. You can therefore say whether there are references around, but you cannot identify the Python objects. I would like to occasionally dynamically grow an array (i.e. add length to existing dimensions) as I do not know th ultimately required length beforehand, but I have a good guess so I won't be need to reallocate that often if at all. The only way I know how to do this is numpy is to create a new larger array with the new dimensions and copy the existing data from the smaller array into it. Perhaps there is a better way that doesn't invalidate views on the array? I want to make sure that there are no outstanding references to the old array (i.e. views on it, etc.) so that I can raise a helpful exception while developing. Numpy does complain if you attempt to resize an array with views on it: In [8]: x = np.array([1,2,3]) In [14]: y = x[::-1] In [18]: x.resize((4,)) --- ValueErrorTraceback (most recent call last) /tmp/ipython console in module() ValueError: cannot resize an array that has been referenced or is referencing another array in this way. Use the resize function You can catch that exception and work from there. I hope that is what you had in mind? Regards Stéfan ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] List Array References?
On Fri, Feb 15, 2008 at 11:51 AM, Stefan van der Walt [EMAIL PROTECTED] wrote: Numpy does complain if you attempt to resize an array with views on it: In [8]: x = np.array([1,2,3]) In [14]: y = x[::-1] In [18]: x.resize((4,)) --- ValueErrorTraceback (most recent call last) /tmp/ipython console in module() ValueError: cannot resize an array that has been referenced or is referencing another array in this way. Use the resize function You can catch that exception and work from there. I hope that is what you had in mind? Actually, I'm essentially trying to figure out how situations like that are arising. I'm not using resize, because it reshapes the array when adding to any dimension other than the first. At the end of the day I want to enlarge an array without leaving any references dangling. Thanks for the suggestion! Alex ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
[Numpy-discussion] List Array References?
Is there a way to list all of the arrays that are referencing a given array? Similarly, is there a way to get a list of all arrays that are currently in memory? Thanks, Alex ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
