Thanks a lot, Rui!
On Fri, 27 Jul 2018 at 12:02, Rui Barradas <ruipbarra...@sapo.pt> wrote:
> Hello,
>
> First of all welcome to R, I hope you enjoy it and that as you go along
> it will give less and less troubles.
>
> Now, why would length(56) return 2? It's just one number, a vector of
> length 1.
>
> Start by trying it at an R prompt and see the result.
>
> Hope this helps,
>
> Rui Barradas
>
> Às 16:07 de 27-07-2018, إبراهيم خطاب Ibrauheem Khat'taub escreveu:
> > Hi everyone,
> >
> > I am taking my first R course. This was my first example.
> >
> > When I executed:
> >
> > AddLengthNoise <- function(x) {x + rnorm(length(x))}
> >
> > using 56 as the value of x, I expected the result to be two values,
> > something like:
> >
> > [1] 56.17491697 56.02935105
> >
> > because I expected rnorm to return two values and then 56 to be added to
> > each of them. Instead, I got one value, something like:
> >
> > [1] 56.17491697
> >
> > So I wondered how this happened and wanted to see what happens behind the
> > scene. Coming from the Excel paradigm, I wondered, "Is there something
> like
> > 'show calculation steps' in R?" So I Googled it, and got nothing related
> > but this
> > <
> https://support.rstudio.com/hc/en-us/articles/205612627-Debugging-with-RStudio
> >.
> > So, I tried breaking my code into separate lines and toggling breakpoints
> > at all lines, as follows:
> >
> > 6| AddLengthNoise <- function(x) {
> >
> > - 7| x +
> > - 8| rnorm(
> > - 9| length(
> > - 10| x)
> > - 11| )
> > - 12| }
> >
> > (Where the bullet points above represent the red debugging checkpoints)
> >
> > Then I tried again:
> >
> > AddLengthNoise(56)
> >
> > and as I executed step by step, I could not see what I expected. I
> couldn't
> > see each step's result, and I did not understand what I saw neither in
> the
> > console nor in the "Traceback" window that appeared.
> >
> > My 2 questions:
> >
> > 1. Did I do something wrong?
> > 2. Is there a way to see, like in Excel's "Show calculation steps",
> the
> > result of each step alone (i.e. length(56)=2 ==>
> rnorm(2)={0.17491697;
> > 0.02935105} ==> 56 + {0.17491697; 0.02935105}= ... and so on)?
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@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]]
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