## Round, ceil, floor in eigen

audioguy
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### Round, ceil, floor in eigen

Thu Jul 18, 2013 1:49 pm
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?
jitseniesen
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### Re: Round, ceil, floor in eigen

Thu Jul 18, 2013 2:23 pm
I'm afraid nothing has been done (as far as I know).
audioguy
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### Re: Round, ceil, floor in eigen

Fri Jul 19, 2013 10:44 am
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?
jitseniesen
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### Re: Round, ceil, floor in eigen

Fri Jul 19, 2013 11:23 am
An alternative is to use .unaryExpr(), as in:
Code: Select all
`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.
audioguy
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### Re: Round, ceil, floor in eigen

Fri Jul 19, 2013 12:06 pm
I did this. It worked Dont know about efficiency though

Code: Select all
`ArrayXd time(N*N*N);//.....for ( icounter = 0 ; icounter < N*N*N ; icounter++)      time(icounter) = ceil(time(icounter));`

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