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what is the counterpart of "dble" to convert to real*16?

Last post 05-12-2008, 2:40 PM by Steve Lionel. 8 replies.



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05-10-2008, 7:41 PM

30254547

bsmile_2nd
Joined on 05-11-2008
Posts 7

what is the counterpart of "dble" to convert to real*16?

need to know this quickly, thanks!

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05-10-2008, 9:36 PM

30254548 in reply to 30254547

tim18
Joined on 12-27-2003
Posts 3,319

Re: what is the counterpart of "dble" to convert to real*16?

How about real(x, selected_real_kind(20)) ?

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05-10-2008, 11:09 PM

30254550 in reply to 30254548

bsmile_2nd
Joined on 05-11-2008
Posts 7

Re: what is the counterpart of "dble" to convert to real*16?

not homework, need to modify a lot of lapack subroutines to make them work under real*16, thus it would be most convenient to find out a replacement for dble, otherwise the modification would be terrible ...

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05-11-2008, 5:25 AM

30254555 in reply to 30254550

$MAD\sblionel is online. Last active: 09/06/2008, 11:32 AM$
Steve Lionel
Joined on 03-13-2002
Posts 11,350

Re: what is the counterpart of "dble" to convert to real*16?

real(x,16)

There is not a specific name similar to dble for this.

Steve

Doctor Fortran: intel.com/software/drfortran

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05-11-2008, 8:17 AM

30254559 in reply to 30254555

Repeat Offender
Joined on 11-07-2006
Posts 1

Re: what is the counterpart of "dble" to convert to real*16?

QEXT

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05-11-2008, 8:39 AM

30254560 in reply to 30254559

tim18
Joined on 12-27-2003
Posts 3,319

Re: what is the counterpart of "dble" to convert to real*16?

QEXT does go way back, to DEC platforms even prior to VMS, and to HP3000. Unlike dble() and real(x, KIND=...), it was never defined in a standard, so is not included in many compilers with equivalent functionality.

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05-12-2008, 6:04 AM

30254606 in reply to 30254560

$MAD\sblionel is online. Last active: 09/06/2008, 11:32 AM$
Steve Lionel
Joined on 03-13-2002
Posts 11,350

Re: what is the counterpart of "dble" to convert to real*16?

Ah, yes, missed QEXT. Sorry about that. As Tim notes, it is non-standard.

Steve

Doctor Fortran: intel.com/software/drfortran

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05-12-2008, 12:08 PM

30254647 in reply to 30254560

bsmile_2nd
Joined on 05-11-2008
Posts 7

Re: what is the counterpart of "dble" to convert to real*16?

Thank all so so so much! It works! But I cannot find it in intel fortran manual, maybe due to the fact that it is nonstandard, however, intel supports it, that's enough!

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05-12-2008, 2:40 PM

30254667 in reply to 30254647

$MAD\sblionel is online. Last active: 09/06/2008, 11:32 AM$
Steve Lionel
Joined on 03-13-2002
Posts 11,350

Re: what is the counterpart of "dble" to convert to real*16?

It's in the Language Reference, A-Z section.

Steve

Doctor Fortran: intel.com/software/drfortran

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