MATLAB: How convert an m x n x p image sequence to an m x n x 3 x p sequence efficiently

grayscaleimage sequencesrgb

Hi, I would like to convert my grayscale image sequence to an rgb sequence, and I'm wondering if it possible to do it without a loop?

A - array with size [m x n x p].

out = reshape(repmat(reshape(A,[],p),3,1),[m n 3 p]);

Use element-wise division:

n = 1:100;
format short
Seq = 1./n

producing:

Seq =
    1.0000    0.5000    0.3333    0.2500    0.2000    0.1667    0.1429    0.1250    0.1111 ...

alternatively:

format rat
Seq = 1./n

producing:

Seq =
       1              1/2            1/3            1/4            1/5            1/6  ...

EDIT — (17 Jan 2020 at 17:11)

Forgot to include the plot call.

Here it is:

figure
plot(Seq)
grid

This is the same as:

figure
plot((1:numel(Seq)), Seq)
grid

A=rand(6,3,5,5)
for k=1:size(A,4)
  B{k}=A(:,:,:,k)
end
A4=B{4}
A4(:,:,4:5)=[]