Date: Aug 23, 2013 1:41 AM
Author: Rohit
Subject: Concatenating matrix columns causes loss of precision

Hi all,
I have a curious problem I'm hoping someone can help me with. I have a column matrix say temp1 with floating point numbers in the following format(displayed this way using format long g):


and another nx3 matrix (temp2) with values like so:

25.59989 -17.82167 31.19241
25.17558 -17.59459 30.71448
25.18788 -17.39987 30.61347

I concatenate the 2 matrices column wise, temp = [temp1 temp2];
The resulting matrix is:

1.334305e+09 24.40084 -17.98591 30.31327
1.334305e+09 24.23554 -17.68831 30.00396
1.334305e+09 25.31328 -17.61529 30.83927
I want the resulting matrix to have the original precision of temp1. How do I do this? I have already tried format long g. Writing to a file with dlmwrite and precision set to %.5f results in the fractional part zeroed out.