Re: [R] Using the shape () function

From: Tom Backer Johnsen <backer_at_psych.uib.no>
Date: Wed, 18 Jun 2008 08:07:09 +0200

hadley wickham wrote:
>>> You might try using the reshape package instead:
>>>
>>> last <- function(x) x[length(x)]
>>> names(d) <- c("value", "person", "time")
>>> cast(d, person ~ time, last)
>> The first and the last line I think is clear, although I will have to
>> experiment more to understand the call on cast () better. However, what I
>> do not understand is the purpose of the second line. I can print out
>> names(d) right after the reading the frame with the read.table function. If
>> I print names (d) right after that statement has been executed, then I see
>> no difference. Even so, it seems to be necessary for the call on cast to
>> work. It seems that "names" is not the same as "names". Something along
>> the lines of a with () or attach () perhaps?
>
> It's a small change - but cast requires the value column to be called
> "value" (no s!)

Aha! Thank you!

Tom
>
> Hadley
>



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