18 lines
298 B
Fortran
18 lines
298 B
Fortran
|
real function h1(x)
|
||
|
|
|
||
|
|
! sigma=1.0/sqrt(2.0)
|
||
|
|
sigma=1.0
|
||
|
|
xlim=sigma/sqrt(6.0)
|
||
|
|
ax=abs(x)
|
||
|
|
sgnx=1.0
|
||
|
|
if(x.lt.0) sgnx=-1.0
|
||
|
|
if(ax.le.xlim) then
|
||
|
|
h1=x
|
||
|
|
else
|
||
|
|
z=exp(1.0/6.0 - (ax/sigma)**2)
|
||
|
|
h1=sgnx*sqrt(6.0)*sigma*(2.0/3.0 - 0.5*z)
|
||
|
|
endif
|
||
|
|
|
||
|
|
return
|
||
|
|
end function h1
|