I would like to take the element-wise max of two vectors/matrices in Eigen. So far, I've written this code:
template <typename S, typename T>
auto elemwise_max(const S & A, const T & B) {
return (A.array() > B.array()).select(A, B);
}
Is this correct, or is this there a better way of doing this?
For the positive part (ie. max(A, 0)), I'm not sure how to proceed. Do I need to create two methods?
template <typename S>
auto positive_part_matrix(const S & A) {
auto zeros = S::Zero(A.rows(), A.cols());
return elemwise_max(A, zeros);
}
template <typename S>
auto positive_part_vec(const S & A) {
auto zeros = S::Zero(A.size());
return elemwise_max(A, zeros);
}
Ideally both of the above would just be called positive_part.
The answer is there.
You can either move to the "array" world and use max:
A.array().max(B.array())
or use cwiseMax:
A.cwiseMax(B)
In both cases, B can be either a Matrix or a scalar:
A = A.cwiseMax(0);
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