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Infinity in Fortran

 
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arctica



Joined: 10 Sep 2006
Posts: 105
Location: United Kingdom
PostPosted: Fri Dec 22, 2023 9:51 am    Post subject: Infinity in Fortran Reply with quote
Hello

What is the best way to represent the result of a calculation as +infinity or -infinity in ftn95? In Matlab/Scilab there is a special variable that can be used.

Thanks

Lester
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wahorger



Joined: 13 Oct 2014
Posts: 1217
Location: Morrison, CO, USA
PostPosted: Fri Dec 22, 2023 10:54 pm    Post subject: Reply with quote
If you have a calculation that generates a floating point overflow, you can have it detected. Other than that, you are out of luck. This ability is documented in the HELP file that comes with PLATO. Search for floating point trap, or just "floating point" to get references.

MATLAB traps these conditions (overflow, underflow) and signals internally that infinity is reached. Remember, MATLAB is NOT a compiler that generates native code, as does FTN95. So it can deal with INFINITY in whatever way it chooses.
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