Scores well on notational simplicity.
Loses big on computational efficiency (lots of terms multiplied with zero, then
added to the one nonzero term).
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Sent from my phone. Please excuse my brevity.
On May 14, 2014 10:16:15 AM PDT, Ted Harding <ted.hard...@wlandres.net> wrote:
>Maybe I am missing the point -- but what is wrong with line 3 of:
>
> m=rbind(c(6,4,2),c(3,2,1))
> v= c(3,2,1)
> m%*%diag(1/v)
> # [,1] [,2] [,3]
> # [1,] 2 2 2
> # [2,] 1 1 1
>
>Ted.
>
>On 14-May-2014 15:03:36 Frede Aakmann Tøgersen wrote:
>> Have a look at ?sweep
>>
>> Br. Frede
>>
>>
>> Sendt fra Samsung mobil
>> -------- Oprindelig meddelelse --------
>> Fra: carol white
>> Dato:14/05/2014 16.53 (GMT+01:00)
>> Til: r-h...@stat.math.ethz.ch
>> Emne: [R] matrix column division by vector
>>
>> Hi,
>> What is the elegant script to divide the columns of a matrix by the
>> respective position of a vector elements?
>>
>> m=rbind(c(6,4,2),c(3,2,1))
>>
>> v= c(3,2,1)
>>
>> res= 6/3 4/2 2/1
>> 3/3 2/2 1/1
>>
>>
>> this is correct
>> mat2 = NULL
>>
>> for (i in 1: ncol(m))
>>
>> mat2 = cbind(mat2, m[,i]/ v[i])
>>
>>
>> but how to do more compact and elegant with for ex do.call?
>>
>> Many thanks
>>
>> Carol
>> [[alternative HTML version deleted]]
>>
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help@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.
>
>-------------------------------------------------
>E-Mail: (Ted Harding) <ted.hard...@wlandres.net>
>Date: 14-May-2014 Time: 18:16:12
>This message was sent by XFMail
>
>______________________________________________
>R-help@r-project.org mailing list
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>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
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