R help - Feb 2014 - Passing vectors through a dataframe

Dear All,

I would like to be able to associate a list of vectors (one vector of
which is to be called later) with some other character and numeric
data. I've tried two methods:

1) I can put the vector names in quotes into the dataframe, and then
extract the vector name - but this is just a character string - which
I would then like to use to re-express the original vector, which was
defined earlier.
2) If I try to put the vectors directly into the dataframe it's not
accepted because the vectors have different lengths (and in any case
it is the name of the vector which needs to be associated with the
other data, not particular values).

Probably I'm missing something basic ? Many thanks in advance (!)

Example coding showing how far I've got is as follows:

library(gdata)

F4087 <- c(234,1234,65,34,624,345)
F4187 <- c(234,542,4523,56345,233,5654,776,4788,78768,456,8756)
F4287 <- c(3423,543,6768,867,945,3456,5634,6543,345)

rsquaredtrun <- c("R4087", "R4187", "R4287")
rsquaredtrun
rsquaredvalues <- c(0.1, 0.2, 0.3)
rsquaredvalues
dxtrunlist <- c("F4087", "F4187", "F4287")
dxtrunlist

rsquareddf <- data.frame(rsquaredtrun, rsquaredvalues, dxtrunlist)
rsquareddf

df.agg <- aggregate(rsquaredvalues ~ rsquaredvalues, rsquareddf, max)
df.agg
rsquared.max <- merge(df.agg, rsquareddf)
rsquared.max
rsquared.max2 <- drop.levels(rsquared.max)
rsquared.max2
maxr <- rsquared.max2["dxtrunlist"]
maxr
maxrr <- as.matrix(maxr)
maxrr
maxrrr <- as.vector(maxrr)
maxrrr

The question is - how can I resurrect the vector F4287 from maxrrr  ??

> I would like to be able to associate a list of vectors (one vector of which
is to
> be called later) with some other character and numeric data. 
>  ....
> Probably I'm missing something basic ? 
see ?list

Lists accept vectors of different lengths.

S Ellison


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On 06/02/2014 10:00 AM, Jeremy Clark wrote:
> Dear All,
>
> I would like to be able to associate a list of vectors (one vector of
> which is to be called later) with some other character and numeric
> data. I've tried two methods:
>
> 1) I can put the vector names in quotes into the dataframe, and then
> extract the vector name - but this is just a character string - which
> I would then like to use to re-express the original vector, which was
> defined earlier.
> 2) If I try to put the vectors directly into the dataframe it's not
> accepted because the vectors have different lengths (and in any case
> it is the name of the vector which needs to be associated with the
> other data, not particular values).
Just use a list, not a dataframe.  They can hold any objects, and can 
hold them by name if necessary.

I haven't followed through your example, but the start of it could be 
done like this:

mylist <- list(F4087 = c(234,1234,65,34,624,345),
                        F4187 = 
c(234,542,4523,56345,233,5654,776,4788,78768,456,8756),
                        F4287 = c(3423,543,6768,867,945,3456,5634,6543,345))

and then you can extract F4287 as mylist[["F4287"]].

Duncan Murdoch
>
> Probably I'm missing something basic ? Many thanks in advance (!)
>
> Example coding showing how far I've got is as follows:
>
> library(gdata)
>
> F4087 <- c(234,1234,65,34,624,345)
> F4187 <- c(234,542,4523,56345,233,5654,776,4788,78768,456,8756)
> F4287 <- c(3423,543,6768,867,945,3456,5634,6543,345)
>
> rsquaredtrun <- c("R4087", "R4187",
"R4287")
> rsquaredtrun
> rsquaredvalues <- c(0.1, 0.2, 0.3)
> rsquaredvalues
> dxtrunlist <- c("F4087", "F4187", "F4287")
> dxtrunlist
>
> rsquareddf <- data.frame(rsquaredtrun, rsquaredvalues, dxtrunlist)
> rsquareddf
>
> df.agg <- aggregate(rsquaredvalues ~ rsquaredvalues, rsquareddf, max)
> df.agg
> rsquared.max <- merge(df.agg, rsquareddf)
> rsquared.max
> rsquared.max2 <- drop.levels(rsquared.max)
> rsquared.max2
> maxr <- rsquared.max2["dxtrunlist"]
> maxr
> maxrr <- as.matrix(maxr)
> maxrr
> maxrrr <- as.vector(maxrr)
> maxrrr
>
> The question is - how can I resurrect the vector F4287 from maxrrr  ??
>
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