# [R] Limiting state probability for Markov chain

PIKAL Petr petr.pikal at precheza.cz
Tue Apr 28 14:31:56 CEST 2015

Hi

> x<-A%*%A
> b%*%x
[,1] [,2] [,3]
[1,] 0.36 0.34  0.3
> b%*%x==b
[,1]  [,2]  [,3]
[1,] FALSE FALSE FALSE

if function expects scalar as input

From help page:

cond = A length-one logical vector that is not NA. Conditions of length greater than one are accepted with a warning, but only the first element is used. Other types are coerced to logical if possible, ignoring any class.

So before asking a question it is always advisable to consult respective help page together results of actual commands

BTW your code resembles C+. If you wanted that R behaves as C+ you'd better to use C+ directly.

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Justin
> USHIZE RUTIKANGA
> Sent: Tuesday, April 28, 2015 8:52 AM
> To: r-help at r-project.org
> Subject: [R] Limiting state probability for Markov chain
>
> Dear All,
>
> I am trying to determine  the liming state probability  .
> my_fun<-function(A,b){
> for (j in 1:3){
> x<-A;
> while ((sum(x[j,]) ==1) )
> {
>   x <- x%*%x;
>   print (x);
>   if ( b%*%x==b)
>   {
>     break;
>   }}}
> }
> A<-rbind(c(.5,.3,.2), c(.3,.3,.4),c(.1,.5,.4))
> b <- matrix(data=c(1,0,0), nrow=1, ncol=3, byrow=FALSE)
> my_fun(A,b)
>
> I got the  following warning
> 1: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> 2: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> 3: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> 4: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> 5: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> 6: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> 7: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> 8: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> 9: In if (b %*% x == b) { :
>   the condition has length > 1 and only the first element will be used
> your help will be appreciate
>
> Best Regard
> Ushize Rutikanga Justin
> Student at African Institute for Mathematical Sciences (AIMS) South
> Africa
> E-mail:justinushize at aims.ac.za
> Tel:+27717029144
>
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

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