[Numpy-discussion] converting nan to an integer

2008-10-04 Thread joep
Why does converting nan to an integer not throw an exception (as with inf), instead numpy silently replaces nan by zero? inti = np.array([0,1,2]) inti.dtype dtype('int32') inti[1] = np.inf Traceback (most recent call last): File pyshell#34, line 1, in ? inti[1] = np.inf OverflowError:

[Numpy-discussion] PyArray_New bug?

2008-10-04 Thread Ravi
Hi, PyArray_New seems to return a fortran contiguous array regardless of the requested array type. I am using numpy version 1.1.1. PyObject *obj = PyArray_New( PyArray_Type, 2, dims, /*whatever*/, NULL, NULL, 0, NPY_CARRAY, NULL ); PyObject *obj = PyArray_New(

[Numpy-discussion] fast matrix vector operations

2008-10-04 Thread Gideon Simpson
Suppose I have a toeplitz matrix, A. There is a well known algorithm for computing the matrix vector product Ax, in NlogN operations. An exact reference escapes me, but it may be in Golub van Loan's book. My question is, how could I best take advantage of this algorithm within

Re: [Numpy-discussion] making numpy.dot faster

2008-10-04 Thread Tiziano Zito
Hi, This seems to tell that numpy has been build without altas. Hum, maybe we need to work with the Debian guys to make sure that numpy is available with altas. we had recently a discussion regarding this issue on this mailinglist, see:

Re: [Numpy-discussion] fast matrix vector operations

2008-10-04 Thread Xavier Gnata
Suppose I have a toeplitz matrix, A. There is a well known algorithm for computing the matrix vector product Ax, in NlogN operations. An exact reference escapes me, but it may be in Golub van Loan's book. My question is, how could I best take advantage of this algorithm within

[Numpy-discussion] Warnings for Travis

2008-10-04 Thread Charles R Harris
Hi Travis, The following turned up on the 64-bit windows buildbot. I don't know what triggers them as they don't normally show, but they look legit. numpy\core\src\ufuncobject.c(1700) : warning C4244: '=' : conversion from 'npy_intp' to 'int', possible loss of data

Re: [Numpy-discussion] PyArray_New bug?

2008-10-04 Thread Travis E. Oliphant
Ravi wrote: Hi, PyArray_New seems to return a fortran contiguous array regardless of the requested array type. I am using numpy version 1.1.1. PyObject *obj = PyArray_New( PyArray_Type, 2, dims, /*whatever*/, NULL, NULL, 0, NPY_CARRAY, NULL ); PyObject

[Numpy-discussion] cannot find numpy 1.2 for python 2.6 on window

2008-10-04 Thread Daniel Wolff
Hello, I recently upgraded to python 2.6. I cannot seem to find the appropriate numpy install file. I tried to make use of the .exe built for python 2.5 but the installer hung. Any suggestions? Regards, Daniel ___ Numpy-discussion mailing list

Re: [Numpy-discussion] making numpy.dot faster

2008-10-04 Thread Gael Varoquaux
On Sat, Oct 04, 2008 at 05:59:40PM +0200, Tiziano Zito wrote: Hi, This seems to tell that numpy has been build without altas. Hum, maybe we need to work with the Debian guys to make sure that numpy is available with altas. we had recently a discussion regarding this issue on this

Re: [Numpy-discussion] cannot find numpy 1.2 for python 2.6 on window

2008-10-04 Thread Robert Kern
On Sat, Oct 4, 2008 at 13:14, Daniel Wolff [EMAIL PROTECTED] wrote: Hello, I recently upgraded to python 2.6. I cannot seem to find the appropriate numpy install file. I tried to make use of the .exe built for python 2.5 but the installer hung. Any suggestions? Regards, Daniel Right, you can't

Re: [Numpy-discussion] cannot find numpy 1.2 for python 2.6 on window

2008-10-04 Thread Alan McIntyre
On Sat, Oct 4, 2008 at 11:14 AM, Daniel Wolff [EMAIL PROTECTED] wrote: Hello, I recently upgraded to python 2.6. I cannot seem to find the appropriate numpy install file. I tried to make use of the .exe built for python 2.5 but the installer hung. Any suggestions? Regards, Daniel Hi Daniel,