[R] function lm, get back the coefficient

[Bert Gunter]

Not quite, Gavin. You have to assign the value of unname back:

> z <- structure(2, names="a")
> unname(z)
[1] 2
> z
a
2
> zz <- unname(z)
> zz
[1] 2
> names(z) <- NULL
> z
[1] 2

Cheers,
Bert


On Tue, Jul 26, 2011 at 1:18 PM, Gavin Simpson <gavin.simpson at ucl.ac.uk> wrote:
> On Tue, 2011-07-26 at 16:43 +0100, Barry Rowlingson wrote:
>> On Tue, Jul 26, 2011 at 4:21 PM, ascoquel <ascoquel at yahoo.fr> wrote:
>> > Hi,
>> >
>> > I've done a linear fit on my data and I would like to get back the a (time)
>> > coefficient ...
>> >
>> > mod<-lm(res_sql2$Lx0x~0+time)
>> > result<-data.frame()
>> > result<-coef(mod)
>> > print("result")
>> > print(result)
>> > [1] "result"
>> >      time
>> > 0.02530191
>> >
>> > But I would like just the value 0.02530191 ... I tried result$time but it
>> > doesn't work ...
>>
>>  It is 'just the value'. It happens to be in a named vector with a
>> length of 1. You can do anything to it that you want to do with any
>> other number. Try result * 2, or sqrt(result).
>>
>>  If it really annoys you, try names(result)=NULL to get rid of the name.
>>
>> Barry
>
> `unname()` exists for this purpose:
>
>> foo <- 1
>> names(foo) <- "bar"
>> foo
> bar
>  1
>> unname(foo)
> [1] 1
>
> G
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-- 
"Men by nature long to get on to the ultimate truths, and will often
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-- Maimonides (1135-1204)

Bert Gunter
Genentech Nonclinical Biostatistics