I'm trying to write a function that returns the first value in a matrix/expression that is finite, to do this I thought I would write my own functor for the redux method, but when I look at the documentation I don't really see any information on how to use this function. Is it even possible to pass a functor with state? If not, how else would I evaluate the first finite value in an expression?

What you need is a visitor, see http://eigen.tuxfamily.org/dox/classEig ... 19c347f7b3

ggael wrote:What you need is a visitor, see http://eigen.tuxfamily.org/dox/classEig ... 19c347f7b3

Great, thanks ggael! Is it possible for the visitor to exit once it has found its value? (Other than by throwing an exception...).

ah good point, no I don't see any clean way to exit the loop.