Hi - I am looping over a structural equation model for a variety of datasets.
Occasionally, the model returns an error and the loop then breaks. I'd like
to set a condition which says something like if error, then print NAs
rather than the loop breaking, but I don't know how to say if error.
I'm sorry, I don't understand your problem to the detail so my suggestion
may be waaay off, but how's this? You can see in vector vec - all ok values
except where there's an error.
n - 10
vec - rep(NA, n)
for (j in 1:n)
{tryCatch(ifelse(j==5, vec[j] - j, j), finally=print(oh dear))}
vec
Does ?tryCatch do what you want?
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I've had a look at the conditions in base and I can't get the ones to work
I've looked at but it is all new to me.
For example, I can work the examples for tryCatch, but it won't print a
finally message for me when I apply it to my model. Even if I could get
this to work, I think it would
Thanks Roman - you're right it can do more than I thought. We're close now
to solving it I feel. Essentially I'm trying to get the code below to work.
If the condition is satisfied, it prints 2, but it doesn't save it in z. I
want it to save it even though there's an error. Perhaps you can
On 24/06/2010 7:06 AM, Paul Chatfield wrote:
I've had a look at the conditions in base and I can't get the ones to work
I've looked at but it is all new to me.
For example, I can work the examples for tryCatch, but it won't print a
finally message for me when I apply it to my model. Even if
An old-fashioned and I guess also advised-against method would be to
use try() itself, eg :
set.seed(1)
x - rnorm(1:10)
y - letters[1:10]
z - rnorm(1:10)
for (i in list(x,y,z)){
cc - try(sum(i), silent=T)
if(is(cc,try-error)) {next}
print(cc)
}
Put silent=F if you want to see the error
That's great. That solves it. I can work on eloquence later :) I just to
sort out that model problem:
dof-numeric(10)
for (i in 1:10){
x-rnorm(i-1);y-rnorm(i-1)
cc - try(lm(y~x), silent=T)
if(is(cc,try-error)) {dof[i]-NA}
else
On a similar issue, how can you detect a warning in a loop - e.g. the
following gives a warning, so I'd like to set up code to recognise that and
then carry on in a loop
x-rnorm(2);y-c(1,0)
ff-glm(y/23~x, family=binomial)
so this would be incorporated into a loop that might be
You could do that using the options, eg :
set.seed(1)
x - rnorm(1:10)
y - letters[1:10]
z - rnorm(1:10)
warn -getOption(warn)
options(warn=2)
for (i in list(x,y,z)){
cc - try(mean(i), silent=T)
if(is(cc,try-error)) {next}
print(cc)
}
options(warn=warn)
see ?options under warn
Cheers
On 24/06/2010 11:12 AM, Paul Chatfield wrote:
On a similar issue, how can you detect a warning in a loop - e.g. the
following gives a warning, so I'd like to set up code to recognise that and
then carry on in a loop
x-rnorm(2);y-c(1,0)
ff-glm(y/23~x, family=binomial)
so this would be
Thanks again Joris - you've been very helpful J
From: Joris FA Meys [via R]
[mailto:ml-node+2267176-1824205151-120...@n4.nabble.com]
Sent: 24 June 2010 16:40
To: Paul Chatfield
Subject: Re: How to say if error
You could do that using the options, eg :
set.seed(1)
x - rnorm(1:10)
y -
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