MATLAB: What does [ ]; do in MATLAB

matlab function

Hi, I am looking at some codes. It solves for c at the end,
but it defines c=[]; in the beginning which is like empty matrix.
So what does it do ?

Best Answer

Usually I see that in cases where it must be something because in a loop you're concatenating something onto c. And if c is not defined yet you'll get an error, but it it's something, anything, even null, it's okay. Something like
c = [];
for k = 1 : 5
  c = [c, k];
end
If we didn't define c as null then the c= line inside the for loop would throw an exception the very first time.
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