There is a 3 year old thread about whether these functions are implemented in eigen. I wanted to know if anyone has done this in the mean time?

I'm afraid nothing has been done (as far as I know).

So the easiest way to get the rounded value of the coefficients of an array is to loop through them and use the ceil from math.h?

An alternative is to use .unaryExpr(), as in:

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matrix.unaryExpr(std::ptr_fun<double,double>(std::floor))


I think you need to specify the types to select the correct overload of the floor function, unfortunately.

I did this. It worked Dont know about efficiency though

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ArrayXd time(N*N*N);

//.....

for ( icounter = 0 ; icounter < N*N*N ; icounter++)
      time(icounter) = ceil(time(icounter));