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fb7b81711f
change 1e-2 to 'ftol' in CalSurfG.f90, which may cause problem with small study region (~2 km)
32 lines
444 B
Fortran
32 lines
444 B
Fortran
real function gaussian()
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implicit none
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! real rd
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real x1,x2,w,y1
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real y2
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real n1,n2
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integer use_last
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integer ii,jj
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use_last=0
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y2=0
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w=2.0
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if(use_last.ne.0) then
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y1=y2
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use_last=0
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else
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do while (w.ge.1.0)
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call random_number(n1)
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call random_number(n2)
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x1=2.0*n1-1.0
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x2=2.0*n2-1.0
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w = x1 * x1 + x2 * x2
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enddo
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w=((-2.0*log(w))/w)**0.5
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y1=x1*w
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y2=x2*w
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use_last=1
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endif
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gaussian=y1
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end function
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