On 3/23/07, Anne Archibald <[EMAIL PROTECTED]> wrote:
On 23/03/07, Charles R Harris <[EMAIL PROTECTED]> wrote: > Anyone, > > What is the easiest way to detect in python/C if an object is a subclass of > ndarray? Um, how about isinstance or issubclass? (if you want strictness you can look at whether x.__class__ is zeros(1).__class__)
What I am trying to do is figure out the easiest way to fix up matrix multiplies so they work properly. For instance, the following gives the wrong result: In [15]: I = matrix(eye(2)) In [16]: I*ones(2) Out[16]: matrix([[ 1., 1.]]) where the output should be a column vector. In order to do that, I need to reshape the rh multiplicand before __mul__ calls the dot function. There is also this problem In [17]: I*[[1],[1]] --------------------------------------------------------------------------- exceptions.TypeError Traceback (most recent call last) /home/charris/<ipython console> TypeError: can't multiply sequence by non-int A similar multiplication on the left works just fine. Chuck
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