Dear experts, Is it possible to remove e+xx in the output generated by io.write_array(file,B4,...) Actually, the entries of B4 are integers. >>> B4 array([[ 4.25424070e+10, 3.81028483e+10, 2.12712035e+10], [ 3.36632897e+10, 3.01503208e+10, 1.68316448e+10], [ 8.87911734e+09, 7.95252750e+09, 4.43955867e+09]]) Nils