3D indices for particular values in a 3D array

I want to find the 3D indices for particular values in a 3D array. I was expecting to use something like one would use for a 2D array:

>>[row,col] = find(a==8)

So I tried

>>[row,col,page] = find(a==8)

and

>>[row,col,sheet] = find(a==8)

but these just gave nonsense. Surely there is a way to do this?

[e-mail]

Answer 1

[Stephen23]

Use IND2SUB:

X = randi(9,4,3,2)

X = 
X(:,:,1) =
     9     4     1
     3     1     8
     5     3     7
     8     8     4
X(:,:,2) =
     7     4     7
     7     9     3
     6     3     9
     8     2     7

[R,C,P] = ind2sub(size(X),find(X==8))

R = 4x1

4 4 2 4

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C = 4x1

1 2 3 1

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P = 4x1

1 1 1 2

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[William Sherwin]

Thanks Stephen23 ! Bill Sherwin

[Stephen23]

@William Sherwin: please remember to click the accept button of the answer that helped you!