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ts.intersect bug?

3 messages · Antonio, Fabio Di Narzo, Martin Maechler, Brian Ripley

Original
Antonio, Fabio Di Narzo
# 
This code gives an error:

 a <- ts(1:10, start=0, freq=10)
 b <- ts(1:10, start=1, freq=10)
 ts.intersect(a,b)

This one works normally (and correctly):
 a <- ts(1:10, start=0)
 b <- ts(1:10, start=1)
 ts.intersect(a,b)

Antonio, Fabio Di Narzo.

P.S. How to switch off italian error messages to post on r-help?
_
platform i386-pc-mingw32
arch     i386
os       mingw32
system   i386, mingw32
status
major    2
minor    1.0
year     2005
month    04
day      18
language R
Martin Maechler
# 
AntonioFDN> This code gives an error:

    AntonioFDN> a <- ts(1:10, start=0, freq=10)
    AntonioFDN> b <- ts(1:10, start=1, freq=10)
    AntonioFDN> ts.intersect(a,b)

No, it gives a *warning* and returns NULL.

Why should it not?  a and b  have are not overlapping,
ie. *have* intersection NULL :

  plot(c(0,2), c(0,10), type ="n") ; lines(a); lines(b,col=2)


I think you misunderstand what 'freq' means in the current
context.

    AntonioFDN> This one works normally (and correctly):
    AntonioFDN> a <- ts(1:10, start=0)
    AntonioFDN> b <- ts(1:10, start=1)
    AntonioFDN> ts.intersect(a,b)

    AntonioFDN> Antonio, Fabio Di Narzo.

    AntonioFDN> P.S. How to switch off italian error messages to post on r-help?

    >> version
    AntonioFDN> _
    AntonioFDN> platform i386-pc-mingw32
    AntonioFDN> arch     i386
    AntonioFDN> os       mingw32
    AntonioFDN> system   i386, mingw32
    AntonioFDN> status
    AntonioFDN> major    2
    AntonioFDN> minor    1.0
    AntonioFDN> year     2005
    AntonioFDN> month    04
    AntonioFDN> day      18
    AntonioFDN> language R

    AntonioFDN> ______________________________________________
    AntonioFDN> R-help at stat.math.ethz.ch mailing list
    AntonioFDN> https://stat.ethz.ch/mailman/listinfo/r-help
    AntonioFDN> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Brian Ripley
# 
On Wed, 21 Sep 2005, Antonio, Fabio Di Narzo claimed:
In reality, it gives a helpful warning:
NULL
Warning message:
non-intersecting series in: .cbind.ts(list(...), .makeNamesTs(...), dframe 
= dframe, union = FALSE)

Your two series have no time points in common, see
Time Series:
Start = c(0, 1)
End = c(0, 10)
Frequency = 10
  [1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Time Series:
Start = c(1, 1)
End = c(1, 10)
Frequency = 10
  [1] 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9

or try