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)?
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
