How to remove this error??

here is my code

function [B C] image_comparison1 (H,D)
 H=imread('n.jpg');
H=double(rgb2gray(H));
[m,n] = size(H);
D=imread('9.jpg');
D=double(rgb2gray(D));
[r,c]=size(D);
if m<r 
    B = zeros(r,c);
    B=H;

else if r<m
        C = zeros(m,n);
        C=D;
    end
end

[KSSV]

Where is the error? You have not specified error.

[Rik]

Shouldn't that first line be this:

function [B C] = image_comparison1 (H,D)

Also, why use a function with inputs if you are going to overwrite those inputs anyway? And you are overwriting B and C right after you assign them. Also, only one of the outputs will be set and if r==m neither.

I think you need to go back to the drawing table and really think about what this code should do.

[Jan]

What is the purpose of the code?

    B = zeros(r,c);  % Useless, is overwritten directly:
    B=H;

If m==r the code fails, because B and C are not created.

[Cam Salzberger]

Also, depending on what you're trying to do, you may want to consider im2double rather then just casting to double. At least if you will be doing image processing functionality on the image afterwards.