How to get the pixel values of an image according to a given sequence.?

Let the image be a 3*3 matrix [12 45 44; 43 13 23; 33 98 99] and let there be a sequence [1 4 5 8 2 3 9 6 7]. I have to select the pixel values in the order of the given sequence and to output the x and y coordinates of each. ie., I have to select 1st element of image matrix and to get its coordinate values, then 4th element and so on.

Answer 1

[Azzi Abdelmalek]

IM=[12 45 44; 43 13 23; 33 98 99]
SEQ=[1 4 5 8 2 3 9 6 7]
[x,y]=ind2sub(size(IM),SEQ)

[Jeena]

Thanks sir.

[Image Analyst]

"[I,J] = ind2sub(siz,IND) returns the matrices I and J containing the equivalent row and column subscripts"

So it should instead be

[y, x] = ind2sub(size(IM), SEQ)

Answer 2

[Image Analyst]

Try this:

IM=[12 45 44; 43 13 23; 33 98 99]
SEQ=[1 4 5 8 2 3 9 6 7]
% To get the x and y coordinates:
[y, x] = ind2sub(size(IM), SEQ) % [y, x] is [rows, columns] which ind2sub returns
% To extract the pixel values in column major order
pixelValues = IM(SEQ)

[Jeena]

Thanks sir.