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Noob problem: Defining a fumction and passing values issues an error "Subscript indices must either be real positive integers or logicals."

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I have the following function:
function [ result ] = SSD( i1, i2 )
if size(i1) == size(i2)
[r, c] = size(i1)
result = -(sum(sum((double(i1) - double(i2)).^2)) / (r*c));
else
result = 'invalid';
end
I would like to pass it to images that contain gray values only and the error:
Subscript indices must either be real positive integers or logicals.
Popes up. For debugging purpuse I tried calling the function in this way:
SSD(zeros(3), ones(3));
The error is still there. But if I call the function in this way:
SSD(ones(3), ones(3));
No error. What is happening? Why doesn't the function like zero values?

Accepted Answer

Jon
Jon on 21 Sep 2015
Runs fine on my machine-no errors. 2015a. Do you have a variable named SSD or zeros?
  2 Comments
Kirby Fears
Kirby Fears on 21 Sep 2015
Try clearing your workspace before calling SSD.
clear;
SSD(zeros(3), ones(3));
If this works, you probably had a variable named zeros in your workspace.
Veselin Ivanov
Veselin Ivanov on 21 Sep 2015
Aaaa. Thanks :). I cleaned the workspace and now it worked. I have to get used to that old variables hang around :).

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