Re: [eigen] How to raise double to array powers in Eigen

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On 18.08.2014 00:23, Ian Bell wrote:
cross-posted to stack overflow...

If you cross-post, could you post a link as well?

I need to raise a double value to an array of integer powers, in c++ this
would look something like

Could you be a bit more specific about the "array of integer powers" (I guess 'exponents')? If they are a sequence 0,1,2,3,... your proposed solution is definitely very inefficient. If they are of great range, with no apparent pattern, I would say the exp(log(delta)*exponent) approach is basically the most efficient solution (maybe using log2 and exp2 would be more efficient, if they were available).


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