Mailman 3 September 2006 - NumPy-Discussion

[Numpy-discussion] re:运用EXCEL改进市场营销与财务管理
by "9月9-10日/上海" Sept. 4, 2006

Sept. 4, 2006

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Random number generators
by Charles R Harris Sept. 4, 2006

Sept. 4, 2006

Hi Robert, I am about to get started on some stuff for the random number generators but thought I would run it by you first. I envisage the following: uniform short_doubles -- doubles generated from a single 32 bit random number (advantage: speed) uniform double, short_doubles on the interval (0,1) -- don't touch singularities in functions like log (this is my preferred default) fast_normal -- ziggurat method using single 32 bit random numbers (advantage: speed) fast_exponential -- ziggurat method using single 32 bit random numbers (advantage: speed) MWC8222 random number generator (advantage: speed on some machines, different from mtrand) Except for the last, none conflict with current routines and can be added without a branch. I expect adding MWC8222 might need more extensive work and I will branch for that. So the questions are of utility and naming. I see some utility for myself, otherwise I wouldn't be considering doing the work. OTOH, I already have (C++) routines that I use for these things, so a larger question might be if anyone else sees a use for these. I like speed, but it is not always that important in everyday apps. I see that Pyrex is used for the interface, so I suppose that is one more tool to become familiar with ;) Chuck

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diagflat
by Charles R Harris Sept. 4, 2006

Sept. 4, 2006

Travis has introduced the function diagflat for creating diagonal arrays. It flattens whatever array is supplied and returns its values as the diagonal of a 2-D array or matrix. As the function is currently undocumented I thought now might be a good time to discuss other possible choices for the name. Here is a quick list that comes to mind diagflat (current name) asdiagonal todiagonal asdiag todiag ... Chuck

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Remco Jager/mapper is out of the office.
by R.Jager＠mapperlithography.com Sept. 3, 2006

Sept. 3, 2006

I will be out of the office starting 09/04/2006 and will not return until 09/25/2006. I will respond to your message when I return. For urgent matters please contact Ton van de Peut: T.vdpeut(a)mapperlithography.com

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(no subject)
by Bill Spotz Sept. 3, 2006

Sept. 3, 2006

I think I see a bug in lib.user_array.container class. The __eq__ method is def __eq__(self,other): return self._rc(equal(self.array,other)) the expression equal(self.array,other) will return an ndarray of bools, which is then converted, by way of self._rc(), to whatever the derived class is. In my case, this does not make sense, because an array of bools is not a valid argument to the constructor (actually, the data buffer is accepted, but the results are not reliable). What I want, and it seem most people would want in this situation, is just the array of bools; i.e. don't apply the self._rc() method. Assuming there is agreement that this is the desirable behavior, the same would be true for __lt__, __le__, etc. I will probably override this behavior by defining my own __eq__, etc., in my derived class, just for safety. ** Bill Spotz ** ** Sandia National Laboratories Voice: (505)845-0170 ** ** P.O. Box 5800 Fax: (505)284-5451 ** ** Albuquerque, NM 87185-0370 Email: wfspotz(a)sandia.gov **

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Re: [Numpy-discussion] iiR Xje
by Guendolen Houze Sept. 2, 2006

Sept. 2, 2006

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