On Sun, 20 Dec 2020 at 06:22, Richard O'Keefe wrote:
> More accurately, in x[i] where x and i are simple vectors,
> i may be a mix of positive integers and zeros
> where the zeros contribute nothing to the result
>
Yes, index 0 doesn't get an error or a warning. I think it should.
Eg.
(v <- 1
I've never mastered using negative indexes with my fingers, though...
On December 19, 2020 11:32:46 PM PST, Jim Lemon wrote:
>It does remind me of counting on one's fingers, though.
>
>Jim
>
>On Sun, Dec 20, 2020 at 4:38 PM Bert Gunter
>wrote:
>>
>But c(x[-1], x[1]) is, which is not so terrible
It does remind me of counting on one's fingers, though.
Jim
On Sun, Dec 20, 2020 at 4:38 PM Bert Gunter wrote:
>
But c(x[-1], x[1]) is, which is not so terrible, after all...
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On Sat, Dec 19, 2020 at 9:22 PM Richard O'Keefe wrote:
> More accurately, in x[i] where x and i are simple vectors,
> i may be a mix of positive integers and zeros
> where the zeros contribute nothing to the result
> or it may be a MIX of negative integers and zeros
> where the ze
More accurately, in x[i] where x and i are simple vectors,
i may be a mix of positive integers and zeros
where the zeros contribute nothing to the result
or it may be a MIX of negative integers and zeros
where the zeros contribute nothing to the result
and -k means "do not include element k".
Jim and Bert,
Thank you for your help. It was an indexing problem. I was able to solve it
by changing the split line to: clusters <- split(seq_len(nrow(dd)),
dd$cluster).
Thank you.
Best,
Chao
On Sat, Dec 19, 2020 at 4:19 PM Jim Lemon wrote:
> Hi Chao,
> You have discovered one of the surpri
Hi Chao,
You have discovered one of the surprising things about the extraction
operator "[". It expects to get an object consisting of integers (like
1,2,3,...) or logical values (TRUE,FALSE or 0,1). As you have passed
the _values_ of your cluster, it can't deal with the negative numbers
as they do
1. Thanks for the example.
2. Good opportunity to learn (more) about debugging in R. See ?debug or
?browser()
3. Hint: what do you think ... unlist(clusters[... gives? (you are using
it as an index for subscripting dd)
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that peop
Hi,
I was trying to do a cluster sampling but came across this error: Error in
xj[i] : only 0's may be mixed with negative subscripts. What is the cause
and how to get around? Thank you for your help!
Here is the code:
#simulate some data
y <- rnorm(20)
x <- rnorm(20)
z <- rep(1:5, 4)
w <- rep(1
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