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<== Date ==> <== Thread ==>
Subject: Re: NAN and INF
From: Marty Kraimer <[email protected]>
To: "Rarback, Harvey" <[email protected]>
Cc: "'Brian McAllister'" <[email protected]>, "'[email protected]'" <[email protected]>, "'Clemens Wermelskirchen'" <[email protected]>
Date: Tue, 23 Apr 2002 07:34:35 -0500
OK,

I will use this.
I am not sure isinf should be true for a NAN but it looks like this is the best we can do.

Thanks,

Marty

Rarback, Harvey wrote:


Marty,


Brian McAllister wrote:


On 4/11/2002 at 8:54:36 PDT, Rarback, Harvey wrote:


 >> For VMS I could define epicsMath.h as
 >>
 >> #ifndef epicsMathh #define epicsMathh
 >>
 >> #include <math.h> #define isinf(D) 0
 >>
 >> #endif /* epicsMathh */
 >>
 >> Any better ideas for implementing isinf on VMS?

 > Sounds ok to me.  BTW, the same should apply to Tru64 Unix, aka Digital
 > Unix, aka OSF-1.

Digital Unix provides isnan()/isnanf() and finite()/finitef() for doubles
and floats, respectively.  In libm, defined in math.h.

finite() looks just like isinf().

----
Brian McAllister                    Controls Programmer/Beam Physicist
[email protected]                        MIT-Bates Linear Accelerator
(617) 253-9537                                           Middleton, MA


Sorry but I still don't know what I should do.

For alpha and for vms I currently have

#ifndef epicsMathh
#define epicsMathh

#include <math.h>
#define isinf(D) 0

#endif /* epicsMathh */


Are you suggesting?

ifndef epicsMathh
#define epicsMathh

#include <math.h>
#define isinf(D) (!finite((D)))

#endif /* epicsMathh */

Please dont' respont without testing because I have no way to test on alpha or
vms.


I tested the routines defined in math.h on

DEC C V5.9-005 on Digital UNIX V4.0 (Rev. 1229) and
Compaq C V6.2-003 on OpenVMS Alpha V7.3

and not surprisingly got the same results for the isnan and !finite routines:

a = 0.0   isnan(a) = 0  isinf(a) = 0
b = NaNQ  isnan(b) = 1  isinf(b) = 1
c = INF   isnan(c) = 0  isinf(c) = 1

--Harvey




References:
RE: NAN and INF Rarback, Harvey
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