Re: [R] indexing lists, using brobdingnagian

From: Redding, Matthew <Matthew.Redding_at_dpi.qld.gov.au>
Date: Wed, 28 May 2008 10:25:08 +1000

Hi all,

Sorry about this, my brain finally ticked over.

I just
need to convert the list of brobs to a numeric vector (which I can do,as the answer to
the calculation need not be a brob -- just the terms along the way).

so

nums<-sapply(t,as.numeric)

Does the trick in my case, I think.

Matt Redding  

-----Original Message-----
From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org] On Behalf Of Redding, Matthew
Sent: Wednesday, 28 May 2008 10:18 AM
To: r-help_at_r-project.org
Subject: [R] indexing lists, using brobdingnagian

Dear R-Gurus,

I have ended up with a calculation problem where I need to use brobs. I have to work my way through a vector with a for loop to act on each element in a calculation (refering to the previous value in the new vector of results -- so as far as I know I can't use "apply") -- this produces a list of brobs.

My problem is, how do I act on, plot this list, or do vector calculations with the elements? From the other emails I have read there does not seem to be a means of indexing a range of elements from a list.

library(Brobdingnag)
t<-c(as.brob(5), as.brob(6), as.brob(7), as.brob(8), as.brob(10))

> t
[[1]]
[1] +exp(1.6094)

[[2]]
[1] +exp(1.7918)

[[3]]
[1] +exp(1.9459)

[[4]]
[1] +exp(2.0794)

[[5]]
[1] +exp(2.3026)

> t[2:4]
[[1]]
[1] +exp(1.7918)

[[2]]
[1] +exp(1.9459)

[[3]]
[1] +exp(2.0794)

So if you try plotting that against another variable:

xval<-c(1,2,3,4,5)
plot(t,xval)

you get nothing useful.

Does anyone have some suggestions as to how to make this list of brobs more useful?
I thought cbind might help (cbind(t)) but that did not work.

Kind regards,

Matt Redding

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