sgn[Im(z)] is a function in Fortran that returns the sign of the imaginary part of a complex number z. It will return -1 if the imaginary part is negative, 0 if it is zero, and 1 if it is positive.
To write sgn[Im(z)] in Fortran, you can use the function SIGN(IMAG(z), 1.0), where z is the complex number and 1.0 is the default value to be returned if the imaginary part is zero.
No, sgn[Im(z)] is specifically designed for complex numbers in Fortran. It will return an error if used with non-complex numbers.
Yes, sgn[Im(z)] is a standard function in Fortran and is available in all versions of the language.
While sgn[Im(z)] is specific to Fortran, other programming languages may have similar functions or ways to calculate the sign of the imaginary part of a complex number. It is important to check the documentation for the specific language you are using.