MATLAB: I am executing this piece of code and getting the error” X=X(:,1:2:512); Index exceeds matrix dimensions.” help me to solve it.

matrix

close all; clear all; load woman; X=imread('lena256.bmp'); X=double(X); X=X(:,1:2:512);

run this into your script/command window:

size(X)

what is the size of X ? Does it have three dimensions ? Are you trying to select an index for an array location that does not exist?

Did you understand the answer to your previous questions about array dimensions ?:

Have a look here at the answer, or any other previous answered questions regarding 'index exceeds matrix dimensions' problems around this forum.

You are trying to access a value in your matrix that does not exists.

>> [X,Y,Z] = ndgrid(6:12,20:40,100:150);
>> mask = (3.6.*X.*Y == 750) & (1.98.*X.*Y.*Z == 800);
>> nnz(mask)
ans =
     0

There are no solutions under those constraints.