Hi Duncan, list,
Thanks for the advice, but unfortunately that wasn't what was causing my
problem. I'm still getting the "Recursive indexing failed at level 2"
message even after replacing my unlist(pulse[i]) with pulse[[i]].
Error:
>
pulse_subset[[1:as.numeric(length(pulse[[i]][as.numeric(peak_start[i]):as.numeric(peak_end[i])]))]]
<- pulse[[i]][as.numeric(peak_start[i]):as.numeric(peak_end[i])]
Error in
pulse_subset[[1:as.numeric(length(pulse[[i]][as.numeric(peak_start[i]):as.numeric(peak_end[i])]))]]
<- pulse[[i]][as.numeric(peak_start[i]):as.numeric(peak_end[i])] :
recursive indexing failed at level 2
It's almost as if the length of pulse[[i]] is too small, but it's length
is 1001 and peak_start[i] and peak_end[i] are 192 and 208 respectively.
Also why would the problem crop up only after 200,000 runs?
Bizarre!
Regards,
Jim Hargreaves
On 06/26/2010 01:38 PM, Duncan Murdoch wrote:
On 26/06/2010 8:29 AM, Jim Hargreaves wrote:
On 06/26/2010 01:20 PM, Duncan Murdoch wrote:
On 26/06/2010 7:53 AM, Jim Hargreaves wrote:
Dear fellow R users,
I am replacing elements of a list like so:
pulse_subset[[1:20]]=unlist(pulse[i])[1:20]
If pulse is a list, then pulse[i] is also a list, with one element.
I think you want pulse[[i]], which extracts element i.
Ahh, I specified pulse[i] has >20 values in my original mail.
But that could not be correct. Take a look at length(pulse[i]).
Assuming that i is a scalar value, length(pulse[i]) will be 1. You
really do want pulse[[i]]. You used unlist(pulse[i]) which is
sometimes the same as pulse[[i]], but it really depends on what
pulse[[i]] is. unlist() is a very crude tool, and you should avoid it
unless you really need it.
Basically pulse is a list 1000 elements long, with each element in
pulse having between 1000 and 2000 elements of it's own. Pulse is a
list of lists. Also as far as I am aware, [[ ]]'s should only be
used when assigning values to elements of a list/vector.
Whoever told you that was mistaken.
Duncan Murdoch
unlist(pulse[1]) gives x1, x2, x3, x4, x5 etc. etc.
If pulse_subset is a list, then pulse_subset[[1:20]] is equivalent
to pulse_subset[[1]][[2]][[3]][[4]] ... [[20]], i.e. the syntax
implies that it is a list containing a list etc, nested 20 levels
deep. The error message is telling you that it's not. I'm not sure
what your intention is in this case.
Duncan Murdoch
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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and provide commented, minimal, self-contained, reproducible code.
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and provide commented, minimal, self-contained, reproducible code.
