Mailman 3 November 2006 - SciPy-Dev

0.5.2 Windows binary?
by Mathew Yeates Nov. 2, 2006

Nov. 2, 2006

Anybody got a 0.5.2 (or 0.5.1 recompiled with numpy 1.0) windows binary? Mathew

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Synonym for the Modified Bessel Function of the Third Kind
by Nils Wagner Nov. 2, 2006

Nov. 2, 2006

Hi all, Using ipython info special yields Bessel Functions jn -- Bessel function of integer order and real argument. jv -- Bessel function of real-valued order and complex argument. jve -- Exponentially scaled Bessel function. yn -- Bessel function of second kind (integer order). yv -- Bessel function of the second kind (real-valued order). yve -- Exponentially scaled Bessel function of the second kind. kn -- Modified Bessel function of the third kind (integer order). kv -- Modified Bessel function of the third kind (real order). kve -- Exponentially scaled modified Bessel function of the third kind. iv -- Modified Bessel function. ive -- Exponentially scaled modified Bessel function. hankel1 -- Hankel function of the first kind. hankel1e -- Exponentially scaled Hankel function of the first kind. hankel2 -- Hankel function of the second kind. hankel2e -- Exponentially scaled Hankel function of the second kind. lmbda -- **Sequence of lambda functions with arbitrary order v. kn denotes the modified Bessel function of the third kind. However the term "Modified Bessel function of the *second* kind" seems to be more common. http://mathworld.wolfram.com/ModifiedBesselFunctionoftheThirdKind.html It would be nice if "*second*" could be added. Nils

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PIL and sparse matrices?
by Bill Baxter Nov. 2, 2006

Nov. 2, 2006

>From what I understand PIL images are basically stored as a list of pointers to rows of data. It's a good way to do it if you want to manipulate images so big that you become unlikely to be able to allocate that much contiguous free space. It seems to me that CSR sparse matrices are pretty similar in structure, just with the addition of a list of indices per row. Perhaps the same machinery could be dumbed down a bit to allow for PIL image data to be handled directly in SciPy. Perhaps a "UDR" format (uncompressed dense row)? Just a thought. --bb

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Ebuilds and Attribute error
by Martin Höfling Nov. 1, 2006

Nov. 1, 2006

Hi there, first of all, i've created subversion ebuilds for numpy and scipy so if anyone is interested in them just tell me. It seems as if there' something wrong with numy: I tried from the tutorial in the documentation. In [1]: from scipy import * In [2]: x,y = mgrid[-1:1:20j,-1:1,20j] --------------------------------------------------------------------------- exceptions.AttributeError Traceback (most recent call last) /home/martin/<console> /usr/lib/python2.4/site-packages/numpy/lib/index_tricks.py in __getitem__(self, key) 129 typ = int 130 for k in range(len(key)): --> 131 step = key[k].step 132 start = key[k].start 133 if start is None: start=0 AttributeError: 'complex' object has no attribute 'step' I tried also to revert back to numpy 1.0, no change. Best wishes, Martin -- HTML erhöht den Informationsgehalt eines Postings *immer* um ein paar unvorteilhafte Informationen über den Verfasser. (Thore Tams, de.soc.netzkultur, 17.5.1999)

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