Hi all,
I have two vectors like this:
x <- c( "Y", "H", NA, NA )
y <- c( NA, "H", NA, "B" )
And would like to make one vector with the common elements, and the element
available only in one of the vectors.
res <- c( "Y", "H", NA, "B" )
Thanks,
Patricia
> From: neptune...@hotmail.com
> To: r-help@r-project.org
> Date: Wed, 28 Jan 2009 14:15:20 +0000
> Subject: [R] initial value in 'vmmin' is not finite
>
>
> Dear r helpers
>
> I run the following code for nested logit and got a message that
>
> Error in optim(c(0, 0, 0, 0, 0.1, -2, -0.2), fr, hessian = TRUE, method =
> "BFGS") : initial value in 'vmmin' is not finite
> What does this mean? and how can I correct it?
>
> Thank you
> June
>
> > yogurt = read.table("yogurtnp.csv", header=F,sep=",")> attach(yogurt)>
> > dim(yogurt)[1] 12784 25> choice = yogurt[,2:5]> price=yogurt[,14:17]>
> > feature=yogurt[,6:9]> n = nrow(yogurt)> constant = rep(1,each=n)>
> > yop=cbind(constant,feature[,1],price[,1])>
> > dan=cbind(constant,feature[,2],price[,2])>
> > hil=cbind(constant,feature[,3],price[,3])> wt=cbind(feature[,4],price[,4])>
> > > fr <- function(x) { + x1 = x[1]+ x2 = x[2]+ x3 = x[3]+ x4 = x[4]+ x5 =
> > x[5]+ x6 = x[6]+ x7 = x[7]+ con1 = rbind(x[1],x[5],x[6])+ con2 =
> > rbind(x[2],x[5],x[6])+ con3 = rbind(x[3],x[5],x[6])+ con4 =
> > rbind(x[5],x[6])+ rho=exp(x[7])/(1+exp(x[7]))+ ey = exp((yop%*%con1)/rho)+
> > ed = exp((dan%*%con2)/rho)+ eh = exp((hil%*%con3)/rho)+ ew =
> > exp((wt%*%con4)/rho)+ ev = ey+ed+eh+ew+ den=(ey+ed+eh+ew)+ iv =
> > rho*log(den)+ pp=exp(x[4]+iv)/(1+exp(x[4]+iv))+ pr1 =pp* ey/den+ pr2 =pp*
> > ed/den+ pr3 =pp* eh/den+ pr4 =pp* ew/den+ pnp=1/(1+exp(x[4]+iv))+
> > likelihood = (pnp*yogurt[,1])+(pr1*yogurt[,2])+(pr2*yogurt[,3])+(pr3*yogurt!
[,!
> 4])+(pr4*yogurt[,4])+ lsum = log(likelihood)+ return(-colSums(lsum))+ }> p =
> optim(c(0,0,0,0,0.1,-2,-0.2),fr, hessian = TRUE, method = "BFGS")Error in
> optim(c(0, 0, 0, 0, 0.1, -2, -0.2), fr, hessian = TRUE, method = "BFGS") :
> initial value in 'vmmin' is not finite
>
> _________________________________________________________________
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