NAME

atan, atan2 − arc tangent function

SYNOPSIS

jsr    pc,atan[2] double atan(x)
double x;
double atan2(x, y)
double x, y;

DESCRIPTION

The atan entry returns the arc tangent of fr0 in fr0; from C, the arc tangent of x is returned.  The range is −π/2 to π/2.  The atan2 entry returns the arc tangent of fr0/fr1 in fr0; from C, the arc tangent of x/y is returned.  The range is −π to π. 

DIAGNOSTIC

There is no error return. 

BUGS