Hallo
On 13 Apr 2004 at 13:25, Dansen, Ing. M.C. wrote:
> Hi,
> I'm just a beginner, who has just encountered a problem!
>
> 1. - I wanted to load a csv file with names in the rows (1st column)
> and and numbers in the 2nd til 10th column. The file contains
> names in the headers.
>
> - I used; a <- as.matrix(read.table("filename",
sep=',",
> row.names=1, header=TRUE)
maybe read.csv("filename") will do the same without need for other
specifications.
Why do you convert it to matrix? What is wrong with data frame?
>
> Question; 1 - I would like to select the first four columns
a[1:4,]
> 2 - and execute a pca(plot) from the mva package on
> those four columns
go through examples in mva
> 3 - how can I set the data type eg(string, integer,
> double) separate for each column
During loading process you can use colClasses argument to read.csv or
read.table.
Or you can change the column type by as.xxxxxxx statement
>
> Can anyone help me out, Help!
>
> Thanks in advance,
>
> Marinus
Cheers
Petr
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Petr Pikal
petr.pikal at precheza.cz