use a loop to iterate through the number of columns in a matrix/array

I combine two images together by doing this -

imshow([image1(:,1:125,: ) image2(:,126:end,: )]);

Now I want to make a loop that will iterate over all the column indices of my matrix.

Answer 1

[Drew how]

for col = 0: ????
imshow([image1(????) image2(????)]);
drawnow;
end

Answer 2

[Walter Roberson]

newimage = [image1(:,1:125,: ), image2(:,126:end,: )];
for K = 1 : size(newimage,2)
  thiscolumn = newimage(:,K,:);
  do something with the data
end