[R] 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

Re: [R] finding derivative of a data series in R

Thanks Dennis. I got you. My main consern was how to differentiate a series correctly. I think the first procedure is more accurate. Regards. On 27 May 2011 16:27, Dennis Murphy djmu...@gmail.com wrote: Hi: A function and its spline approximation are not equivalent functions, hence neither

Re: [R] finding derivative of a data series in R

However if we have some discrete data set like daily temperature etc how can we can differentiate it because as.expression(D()) will not work then On 27 May 2011 16:52, nandan amar nandan.a...@gmail.com wrote: Thanks Dennis. I got you. My main consern was how to differentiate a series

Re: [R] finding derivative of a data series in R

derivative of a data series in R However if we have some discrete data set like daily temperature etc how can we can differentiate it because as.expression(D()) will not work then On 27 May 2011 16:52, nandan amar nandan.a...@gmail.com wrote: Thanks Dennis. I got you. My main consern was how

Re: [R] finding derivative of a data series in R

-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of nandan amar Sent: Friday, May 27, 2011 10:44 AM To: r-help; Dennis Murphy Subject: Re: [R] finding derivative of a data series in R However if we have some discrete data set like daily temperature etc how can we can differentiate