[R] subset by multiple columns satisfying the same condition

[Peter McMahan]

say x is you rdata frame and y is the vector of column indices you  
want to match to a condition:

x[apply(x[y]=="Tom",1,all),]

still, i feel like there's probably a better way...

On Mar 18, 2007, at 1:36 PM, Frank Duan wrote:

> Hi All,
>
> I have a very simple question. Suppose I had a data frame with 100  
> columns,
> now I wanted to select rows with the values of  some columns  
> satisfying the
> same condition, like all equal to "Tom". I know I can use the 'and'  
> operator
> "&", but it's painful if there were many columns.
>
> Can anyone give me some advice? Thanks in advance,
>
> FD
>
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