If someone else wants to know, this works:
import rpy2.robjects as R
vec1 = R.r['mtcars'][0]
vec2 = R.r['mtcars'][1]
m = R.r.matrix(R.r['append'](vec1,vec2), nrow=R.r['length'](vec1))
But I'm still wondering if there is a more direct approach, or if there is
a way to use index vectors.
Kind regards,
Niek
On Mon, Feb 27, 2012 at 10:00 AM, Niek de Klein <niekdekl...@gmail.com>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>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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>>
>>
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