[R] from .csv file to a pca plot

[Petr Pikal]

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