MATLAB: How to find locations of multiple values within a matrix.

subsample; find

Hi, I have an array of data repeating 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10…

I need to find the locations where values equal to 1, 4, 7, 10 are found to create a subsample using those locations.

In this case it will be position 1 4 7 10 11 14 17 20 and so on.

Please, help! Thanks, Pavel

Best Answer

The function ismember is what you are looking for.

x=[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
y=find(ismember(x,[1, 4, 7, 10 ])),

Related Solutions

MATLAB: Neighbor searching

I = zeros(10);
x = 4;
y = 5;
I(x,y) = 1;
[yout,xout] = find((bwdist(I,'chessboard') == 1)');

variant 2

x=1:10;
y=1:10;
[X Y]=meshgrid(x,y);
i1 = 4;
j1 = 5;
[yout,xout] = find(max(abs(X-i1),abs(Y-j1))' == 1);

MATLAB: Is it possible to extract the values with a vector of indices for each row without using the for statement from the matrix

see sub2ind()

A = [1, 2, 3; 4, 5, 6; 7, 8, 9; 10, 11, 12]; % reference matrix
b = [2; 1; 1; 3]; % index for each row that I want to extract
idx = sub2ind(size(A), 1:size(A,1), b.');
A(idx)

Result

>> A(idx)
ans =
     2     4     7    12

Best Answer

Related Solutions

MATLAB: Neighbor searching

MATLAB: Is it possible to extract the values with a vector of indices for each row without using the for statement from the matrix

Related Question