Jean-Marc Sac-Epee on Thu, 28 Aug 2014 09:21:42 +0200


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Re: isinteger 

Le 28/08/2014 09:15, Josef Eschgfaeller a écrit :

Is there already a function for this in Pari?

\\ Tests if x is integer.
isinteger (x) = floor(x)==x

\\ For rational x.
isinteger (x) = denominator(x)==1

Thanks
Josef Eschgfaeller


? isinteger(n)=type(n)=="t_INT"
%2 = (n)->type(n)=="t_INT"
? isinteger(3.3)
%3 = 0
? isinteger(3)
%4 = 1


( http://pari.math.u-bordeaux.fr/archives/pari-dev-0207/msg00064.html )

JM

--
Jean-Marc Sac-Epée, Ingénieur de Recherche en Calcul Scientifique,
Institut Élie Cartan de Lorraine, UMR 7502,
http://iecl.univ-lorraine.fr/~Jean-Marc.Sac-Epee
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