[R] error with seq() used in for loop

[Maram SAlem]

I got you Berend.
Thanks again

On 11 October 2015 at 14:20, Berend Hasselman <bhh at xs4all.nl> wrote:

>
> > On 11 Oct 2015, at 14:12, Maram SAlem <marammagdysalem at gmail.com> wrote:
> >
> > Thanks a lot  for your help and patience Duncan.
> > It seems that my questions is really a trivial one but I never realized
> > that 1:4 means 0 1 2 3 4 , never knew it starts from 0.
> >
>
> It doesn’t mean what you mention.
>
> 1:4 is the sequence 1 2 3 4
>
> 1:4-1 is   (1 2 3 4) -1 ==> 0 1 2 3
>
> The 1 is subtracted from all elements of the sequence.
>
> Berend
> >
> >
> > On 11 October 2015 at 14:07, Duncan Murdoch <murdoch.duncan at gmail.com>
> > wrote:
> >
> >> On 11/10/2015 7:52 AM, Maram SAlem wrote:
> >>> Dear All,
> >>> I have a question concerning the seq() function arguments when used in
> a
> >>> for() loop.
> >>> I'll simplify this question to make it more clear. Suppose I have a
> >>> (5*3)matrix s (for ex.) and I need to write a function with  for()
> loop,
> >> in
> >>> each step of the loop I need to generate a sequence whose upper limit
> is
> >>> the ith element of the first row of s, then put the resulting sequences
> >> in
> >>> a list. I used the following simple code (I've only included the first
> >> part
> >>> of the function)
> >>>
> >>>
> >>>> s<-matrix(c(1,0,1,0,1,1,0,0,1,0,0,0,0,0,1),nrow=5,byrow=TRUE)
> >>>> simpfun<- function (x,n,m,p,alpha,beta)
> >>> + {
> >>> + LD<-list()
> >>> + for (i in 1:m-1)
> >>> + {
> >>> + LD[[i]]<-seq(0,x[i],1)
> >>> + }
> >>> + print(LD)
> >>> + }
> >>>> mk<-simpfun(s[1,],n=6,m=4,p=0.3)
> >>> Error in seq.default(0, x[i], 1) : 'to' must be of length 1
> >>>
> >>> Although x is supposed to be the vector
> >>> 1 0 1
> >>> and thus x[1]=1, x[2]=0,x[3]=1.
> >>> So I don't get why the error "Error in seq.default(0, x[i], 1) : 'to'
> >> must
> >>> be of length 1" occurs in the first place.
> >>
> >> The range of your loop is 1:m-1, where m is 4.  That is
> >>
> >>> m <- 4
> >>> 1:m-1
> >> [1] 0 1 2 3
> >>
> >> and x[0] is length 0.
> >>
> >> I think you wanted 1:(m-1) (or even better, seq_len(m-1)) for your loop
> >> values.
> >>
> >> Duncan Murdoch
> >>
> >>>
> >>> Thanks for helping.
> >>>
> >>> Maram
> >>>
> >>>      [[alternative HTML version deleted]]
> >>>
> >>> ______________________________________________
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> >>> 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.
>
>

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