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Complex intrinsics with kind=3 arguments

 
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Kenneth_Smith



Joined: 18 May 2012
Posts: 547
Location: Hamilton, Lanarkshire, Scotland.

PostPosted: Mon Jun 06, 2022 10:18 am    Post subject: Complex intrinsics with kind=3 arguments Reply with quote

It appears that the support for complex intrinsics such as COSH(x) introduced fairly recently does not include support for their use when X is a kind=3 variable.

For the sample below, the symbol CXCOSH is reported by the compiler as missing.

Code:
! Compile with Win32 as program uses kind=3 complex variables
!
!  cosh(x) = cos(j*x)            j = cmplx(0.0,1.0)
!
!   Try x = 1.0 + j1.0
!
print*, cos ( cmplx(0.0,1.0,kind=2) * cmplx(1.0,1.0,kind=2) )
print*, cosh( cmplx(1.0,1.0,kind=2) )
print*
print*, cos ( cmplx(0.0,1.0,kind=3) * cmplx(1.0,1.0,kind=3) )
print*, cosh( cmplx(1.0,1.0,kind=3))
end


Is this an omission, or is there a reason for not providing this support? Rather caught me out for the task I have in hand at the moment (but I can work around using the appropriate identities)

Ken
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 7471
Location: Salford, UK

PostPosted: Mon Jun 06, 2022 11:37 am    Post subject: Reply with quote

Ken

cosh(z) for complex and extended precision z has not been implemented.

In fact none of the new intrinsics with real values have been implemented for extended precision.

As you will know, no extended precision values can be used with 64 bit FTN95.
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Kenneth_Smith



Joined: 18 May 2012
Posts: 547
Location: Hamilton, Lanarkshire, Scotland.

PostPosted: Mon Jun 06, 2022 11:55 am    Post subject: Reply with quote

Thanks Paul, I know what I need to do now. I did not think to test the real value case. Ken
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Kenneth_Smith



Joined: 18 May 2012
Posts: 547
Location: Hamilton, Lanarkshire, Scotland.

PostPosted: Wed Jun 08, 2022 10:26 am    Post subject: Reply with quote

Paul,

Looking at the "old" intrinsics, for complex and extended precision z, log(z) and exp(z) have been implemented but not sqrt(z).
Code:
print*, log(cmplx(0.0,1.0,kind=3))
print*, exp(cmplx(0.0,1.0,kind=3))
print*, sqrt(cmplx(0.0,1.0,kind=3))
end

Ken
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PaulLaidler
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Joined: 21 Feb 2005
Posts: 7471
Location: Salford, UK

PostPosted: Wed Jun 08, 2022 10:48 am    Post subject: Reply with quote

Thanks Ken.

This will be easy to fix.

The compiler is asking for CXSQRT@ but the library routine is CXSQR@.
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