[R] Warning: number of items to replace is not a multiple of replacement length

[Uwe Ligges]

Lyle W. Konigsberg wrote:

> I feel like a complete dolt, as I know this question has been asked by 
> others on a fairly regular basis, but I'm going in circles trying to get 
> the following to work:
> 
> id.prob<-function (tt)
> {
> library(mvtnorm)
> #============================
> Makeham<-function(tt)
> {
> a2=0.030386513
> a3=0.006688287
> b3=0.039047537
> t<-tt-20
> h.t<-a2+a3*exp(b3*t)
> S.t<-exp(-a2*t+a3/b3*(1-exp(b3*t)))
> return(S.t*h.t)
> }
> #===========================
> trans<-function (age)
> {
> indic=c(2,2)
> lage=log(age)
> xpars=c(2.1862908,7.5528077,8.5806697,2.3319461,8.8959507,9.1380187,0.3720293) 
> 
> beta<-c(0,0)
> alpha1<-c(0,0)
> alpha2<-c(0,0)
> beta[1]<-xpars[1]
> alpha1[1]<-xpars[2]
> alpha2[1]<-xpars[3]
> beta[2]<-xpars[4]
> alpha1[2]<-xpars[5]
> alpha2[2]<-xpars[6]
> corr<-matrix(rep(0,4),nc=2)
> corr[1,1]=1
> corr[2,2]=1
> corr[1,2]=xpars[7]
> corr[2,1]=corr[1,2]
> 
> LLK<-0
> L<-c(0,0)
> R<-c(0,0)
> 
> for(j in 1:2){
>   if(indic[j]==1){
>     L[j]<--Inf
>     R[j]<-alpha1[j]-beta[j]*lage}
>   if(indic[j]==2){
>     L[j]<-alpha1[j]-beta[j]*lage
>     R[j]<-alpha2[j]-beta[j]*lage}
>   if(indic[j]==3){
>     L[j]<-alpha2[j]-beta[j]*lage
>     R[j]<-Inf}
> }
> 
>   LLK<-pmvnorm(lower=L,upper=R,corr=corr)[1]
> 
> return(LLK)
> }
> 
> #===========================
> 
> tot<-Makeham(tt)*trans(tt)
> return(tot)
> }
> 
> 
> And then:
> 
>  > id.prob(20)
> [1] 0.0001417763
>  > id.prob(21)
> [1] 0.00018078
>  > id.prob(20:21)
> [1] 0.0001417763 0.0001375794
> Warning messages:
> 1: number of items to replace is not a multiple of replacement length
> 2: number of items to replace is not a multiple of replacement length
> 3: number of items to replace is not a multiple of replacement length
> 4: number of items to replace is not a multiple of replacement length


Please read some introductory literature regarding the S / R language!
Your code is not vectorizable at all.


In
   tot <- Makeham(tt)*trans(tt)

Makeham has length 2 and works (I guess), but in  trans(tt) you have

   lage=log(age)

which has length 2, but you get also length 2 in

   R[j]<-alpha1[j]-beta[j]*lage}

but assign it to a scalar value.



> Ultimately I need to be able to integrate this function, which isn't 
> going to happen (correctly) if I've messed-up writing the function.  
> Thanks for any advice on this.
> 
> Regards,
> Lyle W. Konigsberg
> Professor of Anthropology
> University of Tennessee
> Knoxville, TN
> LyleK at utk.edu
> 
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