Re: [R] Documentation General Comments

From: Gavin Simpson <gavin.simpson_at_ucl.ac.uk>
Date: Tue, 22 Apr 2008 08:45:54 +0100

On Mon, 2008-04-21 at 18:55 -0400, esmail bonakdarian wrote:
> > I realize the R developers are probably overwhelmed and have little time
> > for this, but the documentation really needs some serious reorganizaton.
> > A good through description of basic variable types would help a lot,
> > e.g. the difference between lists, arrays, matrices and frames.
>
> Agreed, esp since I am right now at this moment struggling with the
> differences of lists, arrays and vectors. (I have two vectors that I am
> trying to return from a function as an array of two rows - for some reason
> that's not working)

Do you really mean an array - a 2D array in R is a matrix, and a matrix is just a vector with a dim attribute?

Is this what you want?

> vec1 <- rnorm(10)
> vec2 <- rnorm(10)
> rbind(vec1, vec2)

          [,1] [,2] [,3] [,4] [,5] [,6] vec1 0.3168558 -1.932740 -0.3733405 -0.07928693 -1.8374269 1.6805874 vec2 1.0034995 -1.363651 -1.0013652 -0.42121839 0.3873921 -0.2290361

            [,7] [,8] [,9] [,10] vec1 -0.90785669 0.7075952 1.7158890 -0.8835566 vec2 -0.08870023 0.5470181 -0.7427756 0.6563215
> class(rbind(vec1, vec2))

[1] "matrix"
> # or explicitly coerce to array, but still matrix
> as.array(rbind(vec1, vec2))

          [,1] [,2] [,3] [,4] [,5] [,6] vec1 0.3168558 -1.932740 -0.3733405 -0.07928693 -1.8374269 1.6805874 vec2 1.0034995 -1.363651 -1.0013652 -0.42121839 0.3873921 -0.2290361

            [,7] [,8] [,9] [,10] vec1 -0.90785669 0.7075952 1.7158890 -0.8835566 vec2 -0.08870023 0.5470181 -0.7427756 0.6563215
> class(as.array(rbind(vec1, vec2)))

[1] "matrix"

The use of rbind/cbind is in section 5.8 of An Introduction to R, the manual for R.

G

>
> I just started with the R last week , and I am trying to get up to
> speed with this language. And while I have many years
> of experience with various programming languages, many which
> I have learned on my own, I am encountering a number of things
> that are slowing me down. I have downloaded the various intro/reference
> materials.
>
> I am super-happy to have found this list though, everyone seems
> friendly and helpful, and I am learning a lot from it. Any new/additional
> documentation would be much welcome.
>
> _________________________________________________________________
>
>
> esh_getintouch_042008
> [[alternative HTML version deleted]]
>
> ______________________________________________
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 Dr. Gavin Simpson             [t] +44 (0)20 7679 0522
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Received on Tue 22 Apr 2008 - 07:49:41 GMT

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