[R] Recursive indexing failed at level 2

[Bill.Venables at csiro.au]

Why do you use *double* square brackets on the left side of the replacement?

>From the help info for "[[":

"The most important distinction between [, [[ and $ is that the [ can select more than one element whereas the other two select a single element."

You seem to be selecting 20 elements.

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Jim Hargreaves
Sent: Saturday, 26 June 2010 9:54 PM
To: r-help at r-project.org
Subject: [R] Recursive indexing failed at level 2

Dear fellow R users,

I am replacing elements of a list like so:

pulse_subset[[1:20]]=unlist(pulse[i])[1:20]

where pulse is a list of lists, and pulse [i] has >20 values.

This gives the error "Recursive Indexing failed at level 2". But, 
interestingly this instruction is part of a loop which has gone through 
about 200,000 iterations before giving this error.

Actual code:
 > 
pulse_subset[[1:(length(unlist(pulse[i])[as.numeric(peak_start[i]):as.numeric(peak_end[i])]))]] 
<- unlist(pulse[i])[as.numeric(peak_start[i]):as.numeric(peak_end[i])]

Error in 
pulse_subset[[1:(length(unlist(pulse[i])[as.numeric(peak_start[i]):as.numeric(peak_end[i])]))]] 
<- unlist(pulse[i])[as.numeric(peak_start[i]):as.numeric(peak_end[i])] :
   recursive indexing failed at level 2

If anyone could shed some light I'd be rather grateful.

Regards,
Jim Hargreaves

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