Question

I could not find how to do the following in MATLAB, any help is appreciated:

• I have a matrix X of dimension (mxn) and I want to find which rows have the first element greater than the remaining elements of the same row. And then put the rows that satisfy this in a new matrix Y.

Example:
If X is

2  0  1
3  8  6
7  2  5

Y would be

2  0  1
7  2  5

Answer 1

You’re looking for bsxfun and all:

X = [
    2  0  1
    3  8  6
    7  2  5];

Y = X( all(bsxfun(@gt, X(:,1), X(:,2:end)),2), :)