searching for vector values in a matrix
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Ahmed Alnahdi
il 28 Apr 2015
Commentato: Ahmed Alnahdi
il 28 Apr 2015
Hi, I have a vector with 3 specific values and I want to find their indices in a matrix.
1 Commento
James Tursa
il 28 Apr 2015
What are the dimensions of the matrix? Do the values have to be next to each other in the same row or column?
Risposta accettata
Mohammad Abouali
il 28 Apr 2015
Modificato: Mohammad Abouali
il 28 Apr 2015
% 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(:))
Più risposte (1)
Image Analyst
il 28 Apr 2015
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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