Fortran How can you write sgn[Im(z)] in fortran?

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To write "sgn[Im(z)]" in Fortran, it is suggested to use the SIGN function, which determines the sign of a number. However, there is uncertainty regarding how the SIGN function handles complex numbers in different compilers. It may be advisable to separate the real and imaginary components of a complex variable into distinct variables for better control. The discussion also touches on the need to include specific headers in the Fortran code, although details on which headers are necessary are not provided. Overall, clarity on the handling of complex numbers and the use of the SIGN function is emphasized.
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How can you write "sgn[Im(z)]" in fortran?

Hello everybody;


How can you write "sgn[Im(z)]" in fortran? , then what do

you need to add in the header?

also what does "sign(a,b)" mean?


Much Thanks in advance
 
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I'm not sure how your compiler will handle SIGN with complex numbers. It may be useful for you to keep track of the real/imaginary components separately in different variables rather than using a single COMPLEX variable.

If it does work with complex numbers though, then great.
 

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