NAME

atan2, datan2 − Fortran arctangent intrinsic function

SYNOPSIS

real r1, r2, r3
double precision dp1, dp2, dp3

r3 = atan2(r1, r2)

dp3 = datan2(dp1, dp2)
dp3 = atan2(dp1, dp2)

DESCRIPTION

atan2 returns the arctangent of r1/r2 as a real value.  datan2 returns the double-precision arctangent of dp1/dp2. The generic form atan2 may be used with impunity with double-precision arguments. 

SEE ALSO

trig(3M). 

CX/UX Hf77 Fortran Reference Manual