NAME

atan, datan − Fortran arctangent intrinsic function

SYNOPSIS

real r1, r2
double precision dp1, dp2

r2 = atan(r1)

dp2 = datan(dp1)
dp2 = atan(dp1)

DESCRIPTION

atan returns the real arctangent of its real argument.  datan 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. 

SEE ALSO

trig(3M). 

CX/UX Hf77 Fortran Reference Manual