Evaluates the complete elliptic integral of the kind K(x).

x—Argument for which the function value is desired.

result —The complete elliptic integral K(x).

Double—If present and nonzero, double precision is used.

The complete elliptic integral of the first kind is defined to be:

The argument x must satisfy 0 ≤ x < 1; otherwise, ELK returns the largest representable floating-point number.

The function K(x) is computed using the ELRF Function (PV-WAVE Advantage) and the relation K(x) = RF(0, 1 − x, 1).

The integral K(0) is evaluated.

PRINT, ELK(0.0)

; PV-WAVE prints: 1.57080