MATLAB: Use for loop to create a matrix

for loophomeworkMATLAB

how to write a pgogram to create a 4*3 matrix, and the content of each element of each row of the matrix is the index of it's row.

(1:4)'*[1 1 1];

If using a for loop is not actually a requirement you can do this very simply as such:

myMatrix = rand(5,4); % create 5x4 matrix

myMatrix(3,:) = 1:4; % replace values

If the for loop is a requirement:

myMatrix = rand(5,4); % create 5x4 matrix
for n = 1:4
    myMatrix(3,n) = n;
end

for c=1:Ncells
  for i=1:4
    ....
  end
 end