Matlab 错误：下标赋值维度不匹配

Question

I am trying to convert decimal number to binary. It works for regular decimal numbers. However, when I enter (25.10) I get the subscripted error.

My code below.

function [binary] = decimal2binary(decimal)
% floor : rounds towards minus infinity
% rem : remainder after division
% num2str : converts numbers to strings
% fliplr : flips string bits to get correct order
i = 1.0;
q = floor(decimal/2);
r = rem(decimal, 2);
% THIS IS WHERE THE ERROR OCCURS binary(i) = num2str(r(i));
while 2 <= q
    decimal = q;
    i = i+1;
    q = floor(decimal/2);
    r = rem(decimal, 2);
    binary(i) = num2str(r);
end
binary(i + 1) = num2str(q);
binary = fliplr(binary);
end

Answer 1

Assuming the line with the error is indeed:

binary(i) = num2str(r(i));

Then, when calling the function with argument 25.10, before reaching this line we have:

i=1
r=1.10000
num2str(r(i)) = '1.1'

That's why the attribution

 binary(i) = num2str(r(i));

Does not work. In Matlab, binary(1) is a 1x1 char array. You are trying to fit a 1x3 char array ('1.1') to it.