I am still a beginner so sorry for that very basic question
I am wondering why I am getting that error message in the second code line, while slicing x with c(TRUE, FALSE) works out.
I thought that, ,if one vector is shorter than the other, R will repeat the shorter vector. So I would expect x[TRUE, FALSE] to produce the same result as x[c(TRUE, FALSE)] does?
Thanks for your help!
x<-3:10
x[c(TRUE, FALSE)]
[1] 3 5 7 9
x[TRUE, FALSE]
error in x[TRUE, FALSE] :wrong number of dimensions
In the first code, you provide a single indexing vector of length 2, namely c(TRUE, FALSE). Yes, this vector will be recycled until all the elements of x are covered.
In the second code, you do not have single indexing vector. Rather, you have provided a row indexing vector, namely c(TRUE), and a column indexing vector, namely c(FALSE). R is confused and is wondering why you are supplying row and column indexes for a 1 dimensional object, i.e., the vector x.
You may wish to go through the swirl package for a tutorial on vectors.
And I didn't know swirl yet, but it looks very good! The swirl() command does not seem to work - should it present me with course options? Or do I need to install courses from github first?
Hmm, I can install the package and read the help function. But when I put in swirl() R says it can't find the function swirl. But Ill guess Ill find my way through it tomorrow:) Thank you very much for your advice!
Yes, I did.. I get an error message saying that the package "RCurl" is not installed. I tried to install that but R says there is no package called "RCurl". I tried installing "curl" as I randomly saw it in my user library. But that didnt help either. Anyway, I can access the help function of the swirl-package and I simply need to find a way to start one of the courses