As for me, I used empty matrices in MATLAB as well as python rather often. Simple example:
from numpy import array, hstack #... m = A.shape[1] a = array(()).reshape(0,m) for i in some_ind: a = hstack((a, A[i])) for i in some_ind2: a = hstack((a, Aeq[i])) return a other example: from numpy import append def myfunc(arr, arr2 = numpy.array(())) assert(arr.ndim==1 and arr2.ndim==1) return append(arr, arr2, 1) HTH, Dmitrey David Cournapeau wrote: > Hi, > > I was wondering what an empty matrix is, and what it is useful for > (by empty matrix, I mean something created by numpy.matrix([])) ? Using > those crash some functions (see for example scipy ticket #381), and I am > not sure how to fix this bug. > > David > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion > > > > _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
