substituting a column into a 3D matrix

I have a matrix R = zeros(4,5,3) and I want to make the last column of each matrix a different number. such that given C is a vector

for n = 1: end R(:,end, n) = C(n)

I managed a solution where I have a column vector A which if I could substitute into R(:, end, :), but it says mismatch dimensions.

essentially, I want to substitute a column vector into the columns of a 3D matrix R without using a for loop.

[Jan]

"for n=1:end" is not valid. Better: "for n = 1:size(R, 3)".

Answer 1

[Fangjun Jiang]

It's not clear when you mention "last column" for a 3-D matrix. Hope you mean one of the following two cases.

R=zeros(4,5,3);
A=1:20;
R(:,:,3)=reshape(A,size(R,1),size(R,2))
R=zeros(4,5,3);
A=1:12;
R(:,5,:)=reshape(A,size(R,1),size(R,3))

[ily]

thanks. If we assumed the third dimension was a page. Then, I was trying to add a different vector into the last column of each page. I was trying to this without the for loop.

The second solution was very helpful. I understand the key is to make the vectors into a 2-D matrix.

Answer 2

[Jan]

R = zeros(4,5,3);
A = [1, 2, 3];
R(:, end, :) = reshape(repmat(A, 4, 1), [4, 1, 3]);