[R] RStudio 1.1.453 - Windows 10 - How to see detailed results of every calculation step

[إبراهيم خطاب Ibrauheem Khat'taub]

OMG, Jeff, this is so helpful of you!
Thanks a lot!


On Fri, 27 Jul 2018 at 12:32, Jeff Newmiller <jdnewmil using dcn.davis.ca.us>
wrote:

> Debugging in R applies one statement at a time. If you want to debug
> within a statement you can "step into" the function calls within the
> statement or you can execute the function calls separately and inspect the
> result. Your function consists of one statement so the debugger only has
> one place to stop. However, once stopped, you can execute
>
> length(x)
>
> and get a result 1 instead of 2 as you are erroneously expecting.
>
> The length function in R is NOT the equivalent of the LEN function in
> Excel... it tells you how many elements are in the vector, not the number
> of digits in a numeric or the number of characters in a string.
>
> Does
>
> AddLengthNoise( rep(56, 2) ) behave as desired?
>
> On July 27, 2018 8:07:41 AM PDT, "إبراهيم خطاب Ibrauheem Khat'taub" <
> barhomopolis using gmail.com> wrote:
> >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 using 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.
>
> --
> Sent from my phone. Please excuse my brevity.
>

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