[R] A file manipulation question

Andrew Robinson
2004-03-04T03:53:08Z

How about something like ... (if your data frame is called the.data)



summarized <- as.data.frame(levels(the.data$ID))
names(summarized) <- "ID"
summarized$Contract <- as.numeric(tapply(the.data$Contract, the.data$ID,
max))




Andrew

On Wednesday 03 March 2004 19:19, Greg Blevins wrote:
> Hello R experts,
>
> The following problem outstrips my current programming knowledge.
>
> I have a dataframe with two fields that looks like the following:
>
> ID     Contract
>
> 01     1
>
> 01     1
>
> 02     2
>
> 02     3
>
> 02     1
>
> 03     2
>
> 03     2
>
> 03     2
>
> 03     1
>
> 03     1
>
> 03     1
>
> etc...
>
> I would like to end up with a dataframe with one row per ID where the value
> in the contract field would be the highest value recorded for a single ID.
> As you can see above, the number of IDs varies irregularly.  Given the
> above, the new file would look like the following:
>
> ID     Contract
>
> 01     1
>
> 02     3
>
> 03     2
>
> Thanks in advance for your suggestions.
>
> Gregory L. Blevins The Market Solustions Group, Partner
>
>
>
> 	[[alternative HTML version deleted]]
>
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