strange behavior of eigen::select()

Question

in eigen, the construct:

(R.array() < s).select(P,Q);

works when either one or both of P,Q are vectors (of the same length as R). But as soon as both of them are scalars, I get a compilation error.

My question is; is the behavior of select in the presence of two scalars a way for eigen to warn me that there are more efficient constructs? If so, what are they?

score 6 · Accepted Answer · answered Jan 29 '14 at 19:53

6

You can workaround by using VectorXd::Constant(size,value) for one argument.

answered Jan 29 '14 at 19:53

ggael

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yes, that's what I did. But I was wondering if by throwing a warning eigen was 'trying' to tell me that I'm not using the best construct for the job... – user189035 Jan 29 '14 at 19:58
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Nope, it's just that this shortcut does not exist. – ggael Jan 29 '14 at 19:59

score 0 · Answer 2 · answered Apr 03 '20 at 02:00

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Please ref the definition of select() in Eigen: http://eigen.tuxfamily.org/dox/classEigen_1_1DenseBase.html#a65e78cfcbc9852e6923bebff4323ddca

answered Apr 03 '20 at 02:00

Gavin Gao

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strange behavior of eigen::select()

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