atan(3f)
NAME
atan, datan − Fortran arctangent intrinsic function
SYNTAX
real r1, r2
double precision dp1, dp2
r2 = atan(r1)
dp2 = datan(dp1)
dp2 = atan(dp1)
DESCRIPTION
The atan function returns the real arctangent of its real argument. The datan function returns the double-precision arctangent of its double-precision argument. The generic form atan may be used with a double-precision argument returning a double-precision value.