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declaring as pure?

tracyx
New Contributor I
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I'm using some VML routines (for calculating things including the normal cdf, inverse normal cdf). I'd like to call these from functions/subroutines declared as pure. If I change the respective interface block to include the pure keyword, my code compiles and executes as expected. Is this safe? Thanks.
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Chao_Y_Intel
Moderator
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Hello,

How do you change the function declaration by adding pure? For example, for the following function, virngpoisson( method, stream, n, r, lambda )

Only the output vector, and stream may be changed after the function call. It has no other side effect. If they are taken as the output value, it is fine to define the subroutine as pure.

Thanks,
Chao

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tracyx
New Contributor I
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I haven't used the routine you mentioned, but for one I have (to compute normal cdf), I just add the following interface in my (pure) subroutine which calls this.

[fortran]interface
  pure subroutine vdcdfnorm(n,a,r)
    integer,intent(in)         :: n
    real(kind=8),intent(in)    :: a(n)
    real(kind=8),intent(out)   :: r(n)
  end subroutine
end interface[/fortran]

Is this OK?
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Chao_Y_Intel
Moderator
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Hello,
It is fine for this one. r is the only output forthis function.

Thanks,
Chao
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