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

[Michael Dewey]

Dear Ibrauheem

First try

length(56)

then try
rnorm()
using the value you got in stage 1

Michael

On 27/07/2018 16:07, إبراهيم خطاب Ibrauheem Khat'taub 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]]
> 
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> 

-- 
Michael
http://www.dewey.myzen.co.uk/home.html