Re: [Numpy-discussion] Getting 3-D array values from a 2-D array of indexes
On 1/9/07, Jordan Dawe [EMAIL PROTECTED] wrote: I have a 3D array A of shape (nz, ny, nx) and a 2D array B of shape (ny, nx) that contains integer indexes. I want to generate a 2D array C of shape (ny, nx) composed of the values of A at the z-indexes specified in B. Is there an easy way to do this? Jordan you can use integer indexing if you first generate a complete set of coordinates. In your case you have the z-indexes, so you can generate the y and x indices and then use integer indexing: y,x = indices((ny,nx)) C = A[B,y,x] hope it helps, pau ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Where's append in NumPy??
That may be it. I'll get a newer version. --- Robert Kern [EMAIL PROTECTED] wrote: Lou Pecora wrote: After import numpy as N In [10]: print N.__version__ 1.1.2881 does that look right as a recent version? No, that's very old. The version number had briefly gotten bumped to 1.1 in the repository, but we backed that out quickly. -- Robert Kern -- Lou Pecora My views are my own. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Where's append in NumPy?? Can't Installing NumPy.
--- Lou Pecora [EMAIL PROTECTED] wrote: That may be it. I'll get a newer version. No Luck. I downloaded numpy-1.0-py2.4-macosx10.4.dmg from the MacOSX package site, but the installer kept telling me there was nothing to install. I removed the previous NumPy and numpy.pth from the site packages and got the same message. How do I install numpy when another version is there (apparently erroneously marked as a later version)? -- Lou Pecora My views are my own. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
[Numpy-discussion] Need help for implementing a fast clip in numpy (was slow clip)
Hi, I am finally implementing a C function to replace the current slow implementation of clip in python as promised a few weeks ago. The idea is to implement it as the following: def clip(input, min, max): a = input.copy() putmask(a, a = min, min) putmask(a, a = max, max) return a I don't have that much experience in writing general numpy functions, so I was wondering of other people could advise me on the following points. - should I care only about numeric types, eg something where PyArray_ISNUMBER returns true ? - If input is an array of type T1, min a scalar of type T2 and max a scalar of type T3, which type should be the reference, assuming they are all basic numeric types (float, int, etc...). Eg, if T1 is integer, T2 and T3 are float, what am I supposed to do ? Should I use the basic rule as told in numpy doc, and in that case, and do something like this to determine common datatype (pseudo code): int typenum; for each arg in arglist: typenum = PyArray_ObjectType(arg, typenum) - PyArray_PutMask does not assume anything on the datatype of the input array nor this alignement, and treat its binary content as a buffer to char*. Do I need to do the same, or can I just use normal pointer arithmetic on arrays which elements can be casted to basic C types ? cheers, David ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Exported symbols and code reorganization.
On 1/9/07, David Cournapeau [EMAIL PROTECTED] wrote: Charles R Harris wrote: On 1/7/07, *Robert Kern* [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Charles R Harris wrote: snip No, but as with mtrand, most of those arise from the fact that these functions are implemented in files other than the C file that contains the Python module code. In order for them to be called from the Python module code, they need to be exported, IIRMCC (If I Remember My C Correctly). This appears to be true of essentially every other extension module in my site-packages, so I don't think it's going to be much of a problem. I don't think unnecessary public symbols are much of a problem, either, but it bears on the question of breaking up the core numpy files. The parts could be treated in the same way, i.e., compiled separately and linked, or they could be treated as you suggested previously, declared static and the code included into one base file. I suspect the inclusion route is a bit easier from a portability standpoint, long link lists can be a problem and the making of libraries is platform dependent. Bit late at joining the discussion... I started the same thing, splitting up those files. As Travis reminded me in a previous discussion, most symbols in numpy extensions are private (eg static functions) because that's the way python extension works: I think we can do what the multiarray module does, provide a table of function pointers in the _XXX_API module attribute. That way the random and fft functions would be available to c extension modules for those who wanted them while also being kept out of the module namespace. Chuck ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] reduction
On 1/8/07, Robert Kern [EMAIL PROTECTED] wrote: lorenzo bolla wrote: ops. I did it, too. should I delete it?? how?? I closed it as a duplicate. As a nondeveloper, you don't have the permissions to close tickets yourself. Now that this bug is closed, maybe we should make another point release so folks know they should upgrade. Chuck ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Where's append in NumPy?? Can't Installing NumPy.
Lou, This is odd. I've always been able to do it. I sure wish Apple had provided a decent package management system! I have a dmg for 1.0.1 that seems to work well. I wonder where I got it? $ python2.4 Python 2.4.3 (#1, Apr 7 2006, 10:54:33) [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin Type help, copyright, credits or license for more information. import numpy numpy.__version__ '1.0.1' help(numpy.append) Help on function append in module numpy.lib.function_base: append(arr, values, axis=None) Append to the end of an array along axis (ravel first if None) In any case, I'll send it straight to you in a separate email. Let me know how it works. -Chris Lou Pecora wrote: --- Lou Pecora [EMAIL PROTECTED] wrote: That may be it. I'll get a newer version. No Luck. I downloaded numpy-1.0-py2.4-macosx10.4.dmg from the MacOSX package site, but the installer kept telling me there was nothing to install. I removed the previous NumPy and numpy.pth from the site packages and got the same message. How do I install numpy when another version is there (apparently erroneously marked as a later version)? -- Lou Pecora My views are my own. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/ORR(206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception [EMAIL PROTECTED] ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Where's append in NumPy?? Can't Installing NumPy.
Hi, Chris, Some answers below (sort of): --- Christopher Barker [EMAIL PROTECTED] wrote: Lou, This is odd. I've always been able to do it. I sure wish Apple had provided a decent package management system! Amen! I have a dmg for 1.0.1 that seems to work well. I wonder where I got it? I got my original NumPy that wouldn't install from the MacPython site. It was a package with the usual install dialog. Even wiping the existing NumPy from site-packages didn't work. Go figure. Finally got NumPy installed using the tarball from http://www.scipy.org/Download. Did the usual, sudo python setup install stuff and that worked. I now have NumPy 1.01 and it has 'append'. For others information: I had to update SciPy and Matplotlib, too. SciPy turned out *not* to be doable from its tarball on http://www.scipy.org/Download. I got the following error (after a whole LOT of output from compiling, etc.): /usr/local/bin/g77 -g -Wall -undefined dynamic_lookup...blah, blah.../scipy/fftpack/_fftpack.so /usr/bin/ld: can't locate file for: -lcc_dynamic collect2: ld returned 1 exit status /usr/bin/ld: can't locate file for: -lcc_dynamic collect2: ld returned 1 exit status error: Command /usr/local/bin/g77 -g -Wall -undefined dynamic_lookup ...blah, blah.../scipy/fftpack/_fftpack.so failed with exit status 1 Exit 1 Whatever collect2 is ld couldn;t find it. I finally got SciPy installed from the superpack at the http://www.scipy.org/Download site. That seems to work, giving me version 0.5.3dev for SciPy. Matplotlib installed fine from tarball and the setup stuff. I hope that's of use to someone out there. Each time I upgrade something it's an adventure. Thanks for the feedback. -- Lou Pecora My views are my own. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Where's append in NumPy?? Can't Installing NumPy.
Lou Pecora wrote: /usr/local/bin/g77 -g -Wall -undefined dynamic_lookup...blah, blah.../scipy/fftpack/_fftpack.so /usr/bin/ld: can't locate file for: -lcc_dynamic Yup. You can't use g77 with gcc 4. See the instructions I give in the thread recompiling needed for binary module after numpy 1.0. -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Where's append in NumPy?? Can't Installing NumPy.
Ah, that does ring a bell. Sigh. I need to upgrade my memory banks. Sure is tough keeping these packages in sync. Thanks. I'll check it out. --- Robert Kern [EMAIL PROTECTED] wrote: Lou Pecora wrote: /usr/local/bin/g77 -g -Wall -undefined dynamic_lookup...blah, blah.../scipy/fftpack/_fftpack.so /usr/bin/ld: can't locate file for: -lcc_dynamic Yup. You can't use g77 with gcc 4. See the instructions I give in the thread recompiling needed for binary module after numpy 1.0. -- Robert Kern __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
