Find values of row in matrix

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);

[will99]

I found solution ^^ but please suggest other ways if there is one

matrix(index,:);

Answer 1

[TastyPastry]

 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.