[R] If loop

[CALUM POLWART]

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 using 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 using 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)
>>
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>

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