WSJT-X/lib/platanh.f90
2018-11-23 15:10:44 -06:00

25 lines
421 B
Fortran

subroutine platanh(x,y)
isign=+1
z=x
if( x.lt.0 ) then
isign=-1
z=abs(x)
endif
if( z.le. 0.664 ) then
y=x/0.83
return
elseif( z.le. 0.9217 ) then
y=isign*(z-0.4064)/0.322
return
elseif( z.le. 0.9951 ) then
y=isign*(z-0.8378)/0.0524
return
elseif( z.le. 0.9998 ) then
y=isign*(z-0.9914)/0.0012
return
else
y=isign*7.0
return
endif
end subroutine platanh