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fmm_spline
2011 May 27
1
finding derivative of a data series in R
Dear All,
I tried following for getting derivative of a polynomial in R
i<- -10:10
x<-i*i*i+3*i*i+2
fun_spline<-splinefun(i,x)
plot(x,type="l")
lines(x,fx_spline(x, deriv=1), col='green')
lines(x,fx_spline(x, deriv=2), col='green')
Now when I plot
3*i*i + 6*i and 6*i + 6
the plot was not same for first deivative.
where as the 2nd derivative was same
Is this a correct method fo...