[R] How do I subset a dataframe

[Timothy Bates]

Perhaps this:

matches = grep("^ibm|sears|exxon", zeespan$customer, value=F)
zee = zeespan[matches,]

t

On Aug 14, 2011, at 12:44 AM, eric wrote:

> I have a dataframe zeespan. One of the columns has the name "customer". The
> data in the customer column is text. I would like to return a subset of the
> dataframe with all rows that DON'T begin with either "ibm" or "exxon", or
> "sears" in the customer column.
> 
> I tried ....  subset(zeespan, customer != c("ibm" | "exxon" | "sears") )
> 
> That didn't work and even if it did, the text would have to be an exact
> match where what I really want is "begins with".
> 
> Suggestions on how to do this would be appreciated
> 
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