Larry Wall schreef: > +=item pi > + > + constant Num Num::pi = atan(1,1) * 4; > + constant Int Int::pi = 3; > [...] > =item I<Standard Trig Functions> > [...] > + multi Num::func ( Num $x : :$base = 'radians' --> Num ) > + multi Math::Trig::func ( Num $x = $+_, :$base = 'radians' --> Num ) > > where I<func> is one of: > sin, cos, tan, asin, acos, atan, sec, cosec, cotan, asec, acosec, > [...] > =item atan > [...] > + multi Math::Trig::atan2 (Num $y, Num $x = 1 : Num :$base --> Num ) > > This second form of C<atan> computes the arctangent of $y/$x, and > takes the quadrant into account. Otherwise behaves as other > trigonometric functions. -Replaces Perl 5 C<atan2>. > > +[Note: changed atan back to atan2, or the default $x = 1 will > confuse MMD. +The other alternative would be to remove the default. > --law]
I guess that all atan() with two parameters, should be atan2()? -- Grtz, Ruud
