[R] help on establishing a matrix

Henrique Dallazuanna wwwhsd at gmail.com
Wed Jan 30 19:17:40 CET 2008


Perhaps like this:

 diag(mat[data$row, data$column]) <- data$height


On 29/01/2008, Gator Connection <gatorconnection at hotmail.com> wrote:
>
> I am a beginner and this is a naive question.
> I have the following data set.
> row column height
> 1 2 96
> 3 7 67
> 9 25 77
> ......
> I have a matrix of 50*100 data points and about 60% of them are zeros.
> I want to put the height data into the matrix according to their row and column numbers. does anybody have experience in setting up such matrix?
> Your help is highly appreciated.
> Jack
> LSU
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O



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