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function Arg (z: Complex): Real; |
`Arg' returns the complex "argument", i.e. the angle (in radian) in the complex plane with respect to the real axis, of its parameter `z'. The result is in the range of `-Pi < Arg (z) <= Pi'.
`Arg' is an ISO-10206 Extended Pascal extension.
program ArgDemo; var z: Complex; begin z := Cmplx (1, 1); { 1 + i } WriteLn (Arg (z) : 0 : 5) { yields 0.78540, i.e. Pi / 4 } end. |
section 9.12 ArcTan, section 9.135 Ln, section 9.197 Polar.