ARG Function

ARG Function

Computes the phase angle, in radians, of a complex scalar or array.

Usage

result = ARG(z)

Input Parameters

z—A complex scalar or array.

Returned Value

result—A double-precision scalar or array. The range of the returned values is between –π and π.

Keywords

None.

Discussion

The function divides the imaginary part of z by the real part of z and computes the arctangent of the quotient.

For a given a complex number of the form:

z = x + jy = rej φ

the function computes φ as:

φ = atan(y/x)

Example

ARG is used to compute the polar form of the complex number z = 3 + j4.

; Create a complex variable.

z = COMPLEX(3, 4)

r = ABS(z)

phi = ARG(z)

PRINT, r, phi

; PV-WAVE prints: 5.00	     0.927295