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31 lines
950 B
Fortran
31 lines
950 B
Fortran
*DECK CARG
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FUNCTION CARG (Z)
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C***BEGIN PROLOGUE CARG
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C***PURPOSE Compute the argument of a complex number.
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C***LIBRARY SLATEC (FNLIB)
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C***CATEGORY A4A
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C***TYPE COMPLEX (CARG-C)
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C***KEYWORDS ARGUMENT OF A COMPLEX NUMBER, ELEMENTARY FUNCTIONS, FNLIB
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C***AUTHOR Fullerton, W., (LANL)
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C***DESCRIPTION
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C
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C CARG(Z) calculates the argument of the complex number Z. Note
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C that CARG returns a real result. If Z = X+iY, then CARG is ATAN(Y/X),
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C except when both X and Y are zero, in which case the result
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C will be zero.
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C
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C***REFERENCES (NONE)
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C***ROUTINES CALLED (NONE)
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C***REVISION HISTORY (YYMMDD)
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C 770401 DATE WRITTEN
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C 861211 REVISION DATE from Version 3.2
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C 891214 Prologue converted to Version 4.0 format. (BAB)
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C***END PROLOGUE CARG
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COMPLEX Z
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C***FIRST EXECUTABLE STATEMENT CARG
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CARG = 0.0
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IF (REAL(Z).NE.0. .OR. AIMAG(Z).NE.0.) CARG =
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1 ATAN2 (AIMAG(Z), REAL(Z))
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C
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RETURN
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END
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