Hi all, I have a problem with io:read_array Negative entries in matrices get lost by using io.read_array. This is llustrated by means of a short test program ioread.py. Any idea ? Nils 1.0 2.0 3.0 -1.0 2.0 2.0 3.0 0.0 3.0 4.0 4.0 1.0 4.0 5.0 6.0 7.0 from scipy import * file = open("test.mat") a = io.read_array(file) print a