is this a bug of MATLAB?

clc;clear;close all;
i=0;j=0;
for isigmain=0:0.05:0.9
    i=i+1;j=i;
    for isigmaout=(isigmain+0.05):0.05:0.95
        abc(i,j)=isigmain;
        j=j+1;
    end
end

Here is an easy code, I want to get a matrix named abc with size of 19 by 19. But when I run it. The abc is always 18 by 19. Because when isigmain==0.9, '(isigmain+0.05):0.05:0.95' always returns 'Empty matrix: 1-by-0' to isigmaout. Can anybody point out what is the problem?

my version is 7.10.0.499(R2010a),

Answer 1

[Walter Roberson]

No, the bug is in the code.

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

[YANG ??]

Thank you! I agree with that answer. When I change the cyclic variable to integers, results are correct.