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## 9.13 Arg

### Synopsis

    function Arg (z: Complex): Real;

### Description

``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'`.

### Conforming to

``Arg'` is an ISO-10206 Extended Pascal extension.

### Example

    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.

### See also

section 9.12 ArcTan, section 9.135 Ln, section 9.197 Polar.

This document was generated by Frank Heckenbach on May, 10 2002 using texi2html