[R] Adding variables

[tzygmund mcfarlane]

Jim,

Both my emails contained reproducible code (the first one wasn't
completely reproducible - it required one to know that "attenu" is a
base R dataset).

Anyway, thanks for your help.

On Sat, Sep 26, 2009 at 8:11 PM, jim holtman <jholtman at gmail.com> wrote:
> I assumed (since you did not provide reproducible code) that 'mag' was
> a matrix.  If 'station' is a matrix, then
>
> mag + rowSums(station)
>
> will work.  If that does not work, then you need to tell us what your
> data objects are.
>
> On Sat, Sep 26, 2009 at 11:39 AM, tzygmund mcfarlane
> <tzygmund at googlemail.com> wrote:
>> Hi Jim,
>>
>> I might be missing something but your command gives the error:
>> Error in rowSums(mag) : 'x' must be an array of at least two dimensions
>>
>> #############################
>> data(attenu)
>> attach(attenu)
>> rowSums(mag) + rowSums(station)
>> attenu$new<-rowSums(cbind(mag, station))
>> #############################
>>
>> Thanks
>>
>>
>> On Sat, Sep 26, 2009 at 4:30 PM, jim holtman <jholtman at gmail.com> wrote:
>>> Probably more efficient if you remove the 'cbind' which would create a
>>> combined matrix.  Use the following:
>>>
>>> rowSums(mag) + rowSums(station)
>>>
>>> On Sat, Sep 26, 2009 at 11:16 AM, tzygmund mcfarlane
>>> <tzygmund at googlemail.com> wrote:
>>>> Hi,
>>>>
>>>> For very large matrices, is this the most efficient way to add two
>>>> variables together?
>>>>
>>>> #############################
>>>> attach(attenu)
>>>> new<-rowSums(cbind(mag, station))
>>>> #############################
>>>>
>>>> Also, could I be directed to some resources for working with very
>>>> large datasets?
>>>>
>>>> Thanks
>>>>
>>>> ______________________________________________
>>>> R-help at r-project.org mailing list
>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>
>>>
>>>
>>> --
>>> Jim Holtman
>>> Cincinnati, OH
>>> +1 513 646 9390
>>>
>>> What is the problem that you are trying to solve?
>>>
>>
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?
>