search for: firstderivative

Thanks for the response. Yes, I did study the vignette but did not understand it fully. Anyway, I have tried once again now. I am happy to say that I have got what I wanted. library(Ryacas) x <- Sym("x");U <- Sym("U");x0 <- Sym("x0");C <- Sym("C") my_func <- function(x,U,x0,C) { return (U/(1+exp(-(x-x0)/C)))} FirstDeriv <-

Hi all, I am trying to implement the following matlab code with Ryacas : syms U x x0 C d1=diff(U/(1+exp(-(x-x0)/C)),x); pretty(d1) d2=diff(U/(1+exp(-(x-x0)/C)),x,2); pretty(d2) solx2 = solve(d2 == 0, x, 'Real', true) pretty(solx2) slope2=subs(d1,solx2) I have tried the following : library(Ryacas) x <- Sym("x");U <- Sym("U");x0 <-

Have you studied the "Introduction to Ryacas" vignette that come with the package? Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Tue, Sep 19, 2017 at 2:37 AM, Vivek Sutradhara <viveksutra at gmail.com> wrote:

...accroding to the error message. I need help . Please suggest the cause or solution to this problem. Thanks. # code #generate target function (phi(x)-alpha) (allow input x and alpha) target<-function(x,alpha){ pnorm(x)-alpha } #generate the first derivative of the of the target function firstDerivative<-function(x){ exp(-(x^2)/2)/sqrt(2*pi) } # Finding the root by Newton method rootFinding<-function(initialX,setAlpha){ while(target(initialX,setAlpha)!=0){ initialX<-initialX-(target(initialX,setAlpha)/firstfirstDerivative(initialX) } initialX } -- View this message in context: http:/...

Greetings, thank you in advance for the help. I'm currently running the Jaunty Ubuntu release with Wine 1.1.22. P4, 1 DVD Drive, one DVD R/W drive, 1.5 GB Ram, 20 GB Ubuntu partition, 46 gb Windows 7 partition. After difficulties with getting Wine to find my DVD R/W drive, i added the drive manually through /media/cdrom01. However, now IMGBurn, which I am trying to use, recognizes my computer