Displaying 5 results from an estimated 5 matches for "firstderiv".
2017 Sep 19
1
symbolic computing example with Ryacas
...derstand 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 <- deriv(my_func(x,U,x0,C), x)
PrettyForm(FirstDeriv)
#slope <- yacas("Subst(x,x0),deriv(my_func(x,U,x0,C), x)")
slope <- Subst(FirstDeriv,x,x0)
#PrettyForm(slope) - gives errors
PrettyForm(Simplify(slope))
I was confused by the references to the yacas command. Now, I have chos...
2017 Sep 19
2
symbolic computing example with Ryacas
...== 0, x, 'Real', true)
pretty(solx2)
slope2=subs(d1,solx2)
I have tried the following :
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 <- deriv(my_func(x,U,x0,C), x)
PrettyForm(FirstDeriv)
slope <- yacas("Subst(x,x0),deriv(my_func(x,U,x0,C), x)")
PrettyForm(slope)
I don't understand how I should use the Subst command. I want the slope of
the first derivative at x=x0. How do I implement that?
I would appre...
2017 Sep 19
0
symbolic computing example with Ryacas
...s(d1,solx2)
>
>
> I have tried the following :
>
> 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 <- deriv(my_func(x,U,x0,C), x)
>
> PrettyForm(FirstDeriv)
>
> slope <- yacas("Subst(x,x0),deriv(my_func(x,U,x0,C), x)")
>
> PrettyForm(slope)
>
>
> I don't understand how I should use the Subst command. I want the slope of
> the first derivative at...
2007 Oct 27
1
Newton method iteration problem
...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
}
--
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2009 May 29
3
Wine Fails to recognize DVD RW Drive
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