The intended message is that R-style indexing can be achieved by
appending .rx to the variable name, before the "[" operator. It would
then work like just like it would in R.
Example:
# first and third columns
m_subset = mtcars.rx[True, IntVector((1,3))]
Best,
Laurent
On 2012-02-27 11:00, Niek de Klein wrote:
This only shows how to extract 1 row, 1 column or 1 element. I want to
get 2 columns out of a matrix and save that in a new matrix.
Kind regards,
Niek
On Fri, Feb 24, 2012 at 6:38 PM, Laurent Gautier <lgaut...@gmail.com
<mailto:lgaut...@gmail.com>> wrote:
http://rpy.sourceforge.net/rpy2/doc-2.2/html/vector.html#extracting
Best,
L.
On 2012-02-24 18:26, Niek de Klein wrote:
Hi,
I want to do the same thing as in the R example found here:
http://www.r-tutor.com/r-introduction/data-frame/data-frame-column-slice.
He makes use of the mtcars datase which looks like this:
mpg cyl disp hp drat wt ...
Mazda RX4 21.0 6 160 110 3.90 2.62 ...
Mazda RX4 Wag 21.0 6 160 110 3.90 2.88 ...
Datsun 710 22.8 4 108 93 3.85 2.32 ...
And then selects the mpg and hp column with an index vector
> mtcars[c("mpg", "hp")]
mpg hp
Mazda RX4 21.0 110
Mazda RX4 Wag 21.0 110
Datsun 710 22.8 93
It's simple to retrieve one row in rpy2, to get mpg in this case:
import rpy2.robjects as R
R.r['mtcars'][0]
However, I don't know how to select two columns
import rpy2.robjects as R
R.r['mtcars'][R.vectors.IntVector([0,3])]
Gives
TypeError: 'IntVector' object cannot be interpreted as an index
Just like every other vector that is in R.vectors (I tried them all)
So my question comes down to, how can I get an index vector in
rpy2, or if that doesn't exist, how can I select two columns?
Thanks!
Niek
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