data type not understood

Question

I'm trying to use a matrix to compute stuff. The code is this

import numpy as np # some code mmatrix = np.zeros(nrows, ncols) print mmatrix[0, 0] 

but I get 'data type not understood', and it works if I do it from terminal.

Answer 1

Try:

mmatrix = np.zeros((nrows, ncols)) 

Since the shape parameter has to be an int or sequence of ints

http://docs.scipy.org/doc/numpy/reference/generated/numpy.zeros.html

Otherwise you are passing ncols to np.zeros as the dtype.