[R] reading csv-data

[Ivar Herfindal]

Thomas Lumley wrote:

> On Fri, 17 Jun 2005, Johanna Sundvik wrote:
> 
>>However, this "Mean1" is categorical when it should be real numbers.
>>
>>
>>>Mean1
>>
>>[1] 4.4332  8.5113  35.1624 9.1693  2.974   65.1578 43.2241 3.1278  5.3364
>>Levels: 2.974 3.1278 35.1624 4.4332 43.2241 5.3364 65.1578 8.5113 9.1693
>>
>>Why R does not understand that this should be real numbers? What am I doing
>>wrong here? Thanks for your help.
>>
> 
> 
> Your files must have some entries that are not numbers, such as "." or 
> something.  R then can't tell that the field is supposed to be numeric. 
> This may happen with missing data, in which case the na.strings= argument 
> can be used to tell R how missing data are specified.
> 
> You can convert the data to numeric as described in FAQ 7.10
> 
>  	-thomas
> 
I think the problem can be that you use read.csv2(), which expect a 
comma (",") as decimal-indicator (as is common in Scandinavia), and a 
semi-colon (";") as separator between columns. Either you should try 
read.csv(), or you can try read.csv2("example.csv", dec=".", header=TRUE)

Have a look at ?read.csv (read.csv2 is in the same help-text).

Ivar

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