Replacing all negative elements with zero eigen3 c++

问题

As said I want to replace all < 0 elements in a eigen3 matrix in C++ with zero in most efficient manner.

I check that there are negative elements using:

(result.array() < 0).any()

回答1:

A nicer and more efficient way than your proposed method would be to use the select method.

result = (result.array() < 0).select(0, result);

回答2:

I found a way: Create a matrix of zeros of same shape,

zero_matrix.setZero();

And find coeff wise maximum between zero matrix and your matrix.

result = result.array().max(zero_matrix.array());

来源：https://stackoverflow.com/questions/40445701/replacing-all-negative-elements-with-zero-eigen3-c