V3FIT
LIBSTELL
Sources
Pspline
splinck.f
1
subroutine
splinck(x,inx,ilinx,ztol,ier)
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C
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C check if a grid is strictly ascending and if it is evenly spaced
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C to w/in ztol
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C
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real
x(inx)
! input -- grid to check
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C
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integer
ilinx
! output -- =1 if evenly spaced =2 O.W.
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C
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real
ztol
! input -- spacing check tolerance
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C
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integer
ier
! output -- =0 if OK
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C
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C ier=1 is returned if x(1...inx) is NOT STRICTLY ASCENDING...
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C
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C-------------------------------
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C
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ier=0
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ilinx=1
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if
(inx.le.1)
return
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c
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dxavg=(x(inx)-x(1))/(inx-1)
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zeps=abs(ztol*dxavg)
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c
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do
ix=2,inx
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zdiffx=(x(ix)-x(ix-1))
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if
(zdiffx.le.0.0) ier=2
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zdiff=zdiffx-dxavg
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if
(abs(zdiff).gt.zeps)
then
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ilinx=2
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endif
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enddo
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10
continue
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c
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return
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end
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