[R] Adding variables

[jim holtman]

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?