MATLAB: Find values of row in matrix

find rowindexMATLABmatrixrow

so I have matrix and index value I want to get all the values in the row I tried Find & ismember but I didn't get all the values in row 2

matrix = [8 81 82;20 22 23; 3 31 32];
index = 2
find(ismember(matrix,index),1);

 matrix(index,:);

ismember(A,B) returns a logical vector true when A is found in B, it doesn't apply here since you're not trying to create a logical mask.

rowIndex = find(mat(:,1)==31); % Row index
row = mat(mat(:,1)==31,:); % Row

Note that one doesn't need the find command to get the row, because logical indexing will be used.

You could also have gotten it using ismember, as you tried, but swap the arguments:

[~,rowIndex] = ismember(31,mat(:,1));

a = rand(1000,5);
b = min(a,[],2);