New changes from l2g

w
2022-09-12 16:40:28 +00:00
parent 78eb7147d0
commit d713d4f61a
110 changed files with 87672 additions and 1098 deletions
@@ -0,0 +1,44 @@
+      subroutine y_aPLUSbx(npoints0,x0,y0,a,b)
+      implicit none
+!fit for y=a+bx
+      integer npoints0
+      double precision x0(npoints0),y0(npoints0),a,b
+      integer i,npoints
+      double precision xmean,ymean,lxx,lyy,lxy,fn9999,tiny,
+     &x(npoints0),y(npoints0)
+      parameter(fn9999=-9999.0d0,tiny=1.0d-7)
+
+      npoints=0
+      do i=1,npoints0
+        if(dabs(x0(i)-fn9999).gt.tiny.and.
+     &dabs(y0(i)-fn9999).gt.tiny)then
+          npoints=npoints+1
+          x(npoints)=x0(i)
+          y(npoints)=y0(i)
+        endif
+      enddo
+      xmean=0.0d0
+      ymean=0.0d0
+      do i=1,npoints
+        xmean=xmean+x(i)
+        ymean=ymean+y(i)
+      enddo
+      xmean=xmean/dble(npoints)
+      ymean=ymean/dble(npoints)
+      lxx=0.0d0
+      lyy=0.0d0
+      lxy=0.0d0
+      do i=1,npoints
+        lxx=lxx+(x(i)-xmean)**2
+        lyy=lyy+(y(i)-ymean)**2
+        lxy=lxy+(x(i)-xmean)*(y(i)-ymean)
+      enddo
+      if(lxx.ne.0.0d0)then
+        b=lxy/lxx
+        a=ymean-b*xmean
+      else
+        b=-9999.0d0
+        a=-9999.0d0
+      endif
+      return
+      end