[R] If loop

Bert Gunter
Fri, 09 Aug 2024 10:21:07 -0000

"Or use <<- assignment I think.  (I usually return, but return can
only
return one object and I think you want two or more"

You can return any number of objects by putting them in a list and
returning the list.
Use of "<<-" is rarely a good idea in R.

-- Bert

On Fri, Aug 9, 2024 at 1:53?AM CALUM POLWART <polc1410 at gmail.com>
wrote:
>
> OK. The fact it's in a function is making things clearer.
>
> Are you trying to update the values of an object from within the function,
> and have them available outside the function. I don't speak functional
> programming articulately enough but basically
>
> v <- 1
>
> funA <- function() {
> v <- v+1
> }
>
> funA()
> cat (v)
>
> # 1
>
> You either return the v from the function so
>
> funB <- function() {
> v <- v+1
> return (v)
> }
>
> v <- funB()
> cat (v)
> #2
>
> Or use <<- assignment I think.  (I usually return, but return can
only
> return one object and I think you want two or more
>
> v <- 1
> funC <- function() {
> v <<- v+1
> }
>
> funC()
> cat (v)
> #2
>
> On Fri, 9 Aug 2024, 09:03 Steven Yen, <styen at ntu.edu.tw> wrote:
>
> > Thanks. Hmm. The loop is doing what it is supposed to do.
> >
> > > try1<-function(joint12=FALSE,marg1=FALSE,marg2=FALSE,
> > +                cond12=FALSE,cond21=FALSE){
> > + # ***************************************************
> > + # Testing if loop
> > + # ***************************************************
> > + if(joint12){
> > +   {print ("joint12"); cat(joint12,"\n")}
> > +   {print ("marg1"); cat(marg1,"\n")}
> > + } else if (marg1) {
> > +   {print ("marg1"); cat(marg1,"\n")}
> > +   {print ("joint12"); cat(joint12)}
> > + } else if (marg2) {
> > +   {print ("marg2"); cat(marg2)}
> > + } else if (cond12) {
> > +   {print ("cond12"); cat(cond12)}
> > + } else {
> > +   {print ("cond21"); cat(cond21)}
> > + }}
> > > try1(joint12=TRUE)
> > [1] "joint12"
> > TRUE
> > [1] "marg1"
> > FALSE
> > > try1(marg1=TRUE)
> > [1] "marg1"
> > TRUE
> > [1] "joint12"
> > FALSE
> > > try1(marg2=TRUE)
> > [1] "marg2"
> > TRUE
> > > try1(cond12=TRUE)
> > [1] "cond12"
> > TRUE
> > > try1(cond21=TRUE)
> > [1] "cond21"
> > TRUE
> > >
> > On 8/9/2024 2:35 PM, CALUM POLWART wrote:
> >
> > Is something wrong in the initialisation part that we don't see?
> >
> > joint12 <- marg1 <-F
> >
> > marg1 <-T
> >
> > if (joint12) {
> >   print ("joint 12")
> >   cat (joint12)
> > }
> >
> > if (marg1) {
> >   print("marg 1")
> >   cat(marg1)
> > }
> >
> > Would probably be my diagnostic approach
> >
> > On Fri, 9 Aug 2024, 04:45 Steven Yen, <styen at ntu.edu.tw>
wrote:
> >
> >> Can someone help me with the if loop below? In the subroutine, I
> >> initialize all of (joint12,marg1,marg2,cond12,cond21) as FALSE,
and call
> >> with only one of them being TRUE:
> >>
> >>
,...,joint12=FALSE,marg1=FALSE,marg2=FALSE,cond12=FALSE,cond21=FALSE,,,,
> >>
> >> joint12 seems to always kick in, even though I call with, e.g.,
marg1
> >> being TRUE and everything else being FALSE. My attempts with if...
else
> >> if were not useful. Please help. Thanks.
> >>
> >> v1<-cprob(z1,x1,a,b,mu1,mu2,rho,j+1,k+1)
> >>      v0<-cprob(z0,x0,a,b,mu1,mu2,rho,j+1,k+1)
> >>
> >>     ...
> >>
> >>      me1<-me0<-NULL
> >>      if(joint12) {me1<-cbind(me1,v1$p12);
me0<-cbind(me0,v0$p12)}
> >>      if(marg1)   {me1<-cbind(me1,v1$p1);
me0<-cbind(me0,v0$p1)}
> >>      if(marg2)   {me1<-cbind(me1,v1$p2);
me0<-cbind(me0,v0$p2)}
> >>      if(cond12)  {me1<-cbind(me1,v1$pc12);
me0<-cbind(me0,v0$pc12)}
> >>      if(cond21)  {me1<-cbind(me1,v1$pc21);
me0<-cbind(me0,v0$pc21)}
> >>      ...
> >>
> >>    labels<-NULL
> >>    if(joint12) labels<-c(labels,lab.p12)
> >>    if(marg1)   labels<-c(labels,lab.p1)
> >>    if(marg2)   labels<-c(labels,lab.p2)
> >>    if(cond12)  labels<-c(labels,lab.pc12)
> >>    if(cond21)  labels<-c(labels,lab.pc21)
> >>
> >> ______________________________________________
> >> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more,
see
> >> https://stat.ethz.ch/mailman/listinfo/r-help
> >> PLEASE do read the posting guide
> >> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >>
> >
>
>         [[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
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.