Is there a standard way to check for Infinite and NaN in Fortran 90/95?

Question

I\'ve been trying to find a standards-compliant way to check for Infinite and NaN values in Fortran 90/95 but it proved harder than I thought.

• I tried to manua

Answer 1

for testing NaN none of the things worked eg.if testing real s2p to see if it is NaN then

if(isnan(s2p)) 

did not work in gfortran nor did

if(s2p.ne.s2p). 

The only thing that worked was

if(.not.s2p<1.and..not.s2p>1)  

though to make real sure u may want to add

if(.not.s2p<1.and..not.s2p>1.and..not.s2p==1)