why is TMath::Atan2(1,1) = 135 degrees?

Richard T. Jones (jonesrt@uconnvm.uconn.edu)
Thu, 26 Nov 1998 12:15:36 -0500

ROOT users,

Can someone explain why TMath::Atan2() is something other than the
standard atan2() in degrees? As it is, the function returns theta+90.
If this is intended, could it be named something other than Atan2?

thanks,
Richard Jones