[R] Question regarding dataframes, matrix, frame, etc...

[David Winsemius]

?data.matrix

Perhaps:

pairs(data.matrix(asdf[ , 1:7]) )


On Jun 16, 2009, at 10:58 AM, njhuang86 wrote:

>
> Hi all,
>
> As of now, I have a 15x8 matrix (name is "asdf"). The first seven  
> columns
> contain numbers while the last column contains a string. The class  
> of each
> column is "character". When I use the plot function to display a  
> scatter
> plot between any of the two columns, ie. plot(asdf[, 1], asdf[, 2])
> everything works fine. However, if I want to use the command "pairs"  
> to show
> all combination of scatter plots between the first seven columns  
> (without
> the columns of strings), it gives me a error message telling me that  
> I'm
> passing a non-numeric arguement to 'pairs'.
>
> As a result, I changed the original matrix into a dataframe via.
> as.data.frame(asdf) so the columns are of the class "factor".  
> However, when
> I now utilize the pairs command to plot the scatterplots of the  
> first seven
> columns, the scatterplots are totally off. I think that the pairs  
> command
> changes all the factor columns into numeric columns - and by  
> performing this
> class transformation, the values within each column are also  
> physically
> changed.
>
> I'm just really lost. Is there a way to utilize the pairs command in  
> my
> setting? Or is there a method to change the class of each column  
> without
> physically altering the values? Anyways, thanks in advance!!!
> -- 
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>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT