How do I use a matrix in a For Loop Iteration

Hi!

I am trying to run a for loop to get all my iterations completed. So the M and N values need to change at the same time. The issue is everytime I try changing the code I either am getting an error about how the function has to have scalar values or when I fix that then go to the second iteration I am going to i = 2 which is not the next number in my M values. I feel like this is a very basic fix but I cant figure it out!

Very Greatful if someone could help me out with this!

type = 'gaussian';

M = I(:,1);

N = I(1,:);

for i = M

M = M(i);

for j = N

N = N(i);

R = imnoise2(type,M(i),N(i))

R(i) = R;

end

end

Answer 1

[DGM]

There are undefined variables and functions being used. M, N, and R are all being overwritten, and there are likely array size mismatches in the assignments. Nobody can fix this unless they know what it's supposed to do.

type = 'gaussian';
M = I(:,1); % I is undefined
N = I(1,:);

for i = M
    M = M(i); % you immediately overwrite your vector
    for j = N
        N = N(i); % you immediately overwrite your vector
        R = imnoise2(type,M(i),N(i)); % what is this function? you're overwriting R
        R(i) = R; % LHS is a scalar, RHS is ostensibly an array??
    end
end

If you're trying to apply noise to an image with imnoise(), then:

inpict = imread('cameraman.tif');

R = imnoise(inpict,'gaussian',0,0.01);

imshow(R)

If you're trying to do something different, then you'll have to explain what you're trying to do and what the undefined functions and variables are.