when trying to read from for loop, what does this mean I_origin_yiq(i,:,:,d)

when trying to read from for loop, what does this mean I_origin_yiq(i,:,:,d)

Answer 1

[Matt J]

A simpler example,

>> A=reshape(1:12,2,3,2)

A(:,:,1) =

       1     3     5
       2     4     6

A(:,:,2) =

       7     9    11
       8    10    12

>> A(1,:,2)

ans =

       7     9    11

Answer 2

[Image Analyst]

It's a 4D array, and you're specifying the first index to be i, and the last index to be d. So you're extracting a 2D plane from that array.