[R] indexing lists, using brobdingnagian

[Redding, Matthew]

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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