Nothing
findipl <-
function(x,y,j)
{
n=length(x);
#sl...
dxl=diff(x[1:j],1,1);
fl=y[1:j]-lin2(x[1],y[1],x[j],y[j],x[1:j]);
sb2l=0.5*(fl[1:(j-1)]+fl[2:j]);
sl=sum(dxl*sb2l)
#sr...
dxr=diff(x[j:n],1,1);
fr=y[j:n]-lin2(x[j],y[j],x[n],y[n],x[j:n]);
sb2r=0.5*(fr[1:(length(fr)-1)]+fr[2:length(fr)]);
sr=sum(dxr*sb2r)
#
c(j,x[j],sl,sr)
}
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