Hi Dmitry,

You might try

with(MyDataFrame[, 1:3])

is variable1, variable2 and variable3 correspond to the first three columns
of your data, or

with( MyDataFrame( cor( cbind( variable1, variable2, variable3) ) ) )

otherwise.

HTH,
Jorge



On Thu, Apr 7, 2011 at 3:09 PM, Dmitry Berman <> wrote:

> Listers,
>
> I have a question regarding correlation matrices. It is fairly straight
> forward to build a correlation matrix of an entire data frame. I simply use
> the command cor(MyDataFrame). However, what I would like to do is construct
> a smaller correlation matrix using just three of the variable out of my
> data
> set.
>
> When I run this:
> cor(MyDataFrame$variable1, MyDataFrame$variable2,MyDataFrame$variable3) I
> get an error.
>
> Is there a way to do this through a built in function or is this something
> I
> have to construct manually?
>
> Thanks
>
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>
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