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31 lines
920 B
Fortran
31 lines
920 B
Fortran
*DECK CCBRT
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COMPLEX FUNCTION CCBRT (Z)
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C***BEGIN PROLOGUE CCBRT
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C***PURPOSE Compute the cube root.
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C***LIBRARY SLATEC (FNLIB)
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C***CATEGORY C2
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C***TYPE COMPLEX (CBRT-S, DCBRT-D, CCBRT-C)
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C***KEYWORDS CUBE ROOT, ELEMENTARY FUNCTIONS, FNLIB, ROOTS
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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 CCBRT(Z) calculates the complex cube root of Z. The principal root
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C for which -PI .LT. arg(Z) .LE. +PI is returned.
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C
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C***REFERENCES (NONE)
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C***ROUTINES CALLED CARG, CBRT
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C***REVISION HISTORY (YYMMDD)
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C 770401 DATE WRITTEN
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C 890531 Changed all specific intrinsics to generic. (WRB)
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C 890531 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 CCBRT
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COMPLEX Z
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C***FIRST EXECUTABLE STATEMENT CCBRT
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THETA = CARG(Z) / 3.0
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R = CBRT (ABS(Z))
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C
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CCBRT = CMPLX (R*COS(THETA), R*SIN(THETA))
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C
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RETURN
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END
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