# yet another ts problem

**Ross Ihaka
**
ihaka@stat.auckland.ac.nz

*Thu, 13 May 1999 10:20:13 +1200 (NZST)*

On Wed, 12 May 1999, Paul Gilbert wrote:
>* This looks like a slightly different problem then the other ones:
*>*
*>* R : Copyright 1999, The R Development Core Team
*>* Version 0.64.1 (May 8, 1999)
*>* ...
*>* > z <- ts(matrix(c(1:9,NA), 5, 2), start=c(1991,1))
*>* > na <- is.na(z)
*>* > z[na]
*>* Error: subscript (10) out of bounds, should be at most 5
*
There seem to be two problems here
1. I think that "[.ts" tries too hard to turn its value back into
a time series. The only case where this makes sense is when
a selection of columns is taken from a multivariate series.
If a row subset is taken, it can only be a time series if
the subscripts have a very special pattern. This would be
too expensive I think.
In S there is no "[.ts", and a simple array subset is returned.
2. There is a subscripting problem in 0.65 which is tripped by this
(Paul's example triggers a coredump in 0.65). The problem can
be reproduced simply with:
x <- 1:5
i <- matrix(F,nr=5,nc=2)
i[5,2] <- T
x[i]
I will look at the latter, but I think the former needs a look too.
Ross
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