searching for vector values in a matrix

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Ahmed Alnahdi
Ahmed Alnahdi 2015-4-28
评论： Ahmed Alnahdi 2015-4-28
Hi, I have a vector with 3 specific values and I want to find their indices in a matrix.
  1 个评论
James Tursa
James Tursa 2015-4-28
What are the dimensions of the matrix? Do the values have to be next to each other in the same row or column?

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Mohammad Abouali
Mohammad Abouali 2015-4-28
编辑：Mohammad Abouali 2015-4-28
% Creating a sample matrix
yourMatrix=reshape(1:15,5,3)
yourMatrix =
1 6 11
2 7 12
3 8 13
4 9 14
5 10 15
% Creating a sample vector with three values.
yourVector=[1,7,14];
% Now getting the row and cols of those values.
[rows, cols]=ind2sub( size(yourMatrix), ...
arrayfun(@(v) find(yourMatrix==v), ...
yourVector(:)) )
rows =
1
2
4
cols =
1
2
3
The rows and cols of 1,7,14 (the three specific values) are provided. If you are looking only for linear index number then just run:
linIndex=arrayfun(@(v) find(yourMatrix==v), yourVector(:))

更多回答（1 个）

Image Analyst
Image Analyst 2015-4-28
If yourVector is an integer valued vector or a floating point vector with values that are multiples or divisors of 2, then try
firstIndex = find(yourVector == firstSpecificValue);
secondIndex = find(yourVector == secondSpecificValue);
thirdIndex = find(yourVector == thirdSpecificValue);

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