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Reputation: 33

Intel Fortran to calculate hyerbolic function with complex argument

As shown on the official document: COSH

Intel Fortran does not allow users to input complex argument into hyperbolic cosine function. So what is the alternative way to do this?

Upvotes: 1

Views: 430

Answers (1)

Vladimir F Героям слава
Vladimir F Героям слава

Reputation: 60058

Fortran 2008 allows complex argument. Some compilers already allow this. If your does not (as, e.g., ifort 15.0), compute it using exp().

cosh(x) = ( exp(x) + exp(-x) ) / 2

or use the identity

cosh(x+iy) = cosh(x) * cos(y) + i * sinh(x) * sin(y)

Upvotes: 4

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