R devel - Apr 1999 - Multivariate ts -- arithmetic bug [ for SOME time-series ] (PR#178)

Paul wrote to R-devel :

    PaulG> ts() is giving me problems on Solaris:
    PaulG> R : Copyright 1999, The R Development Core Team
    PaulG> Version 0.64.0  (April 8, 1999)
    PaulG> ...
    >> z <- ts(matrix(1:20,10,2), start=c(1969,1), frequency=12)
    >> max(abs(z-z))
    PaulG> Error: invalid time series parameters specified
    >> traceback()
    PaulG> [1] "max(abs(z - z))"
    >> max(abs(z+z))
    PaulG> Error: invalid time series parameters specified

This is a SEVERE (new?) bug.

it's already visible as

  > z <- ts(matrix(1:48,ncol=2), start=c(1969,1), frequency=12);  z+z
  Error: invalid time series parameters specified

Note that not all multivariate  ts show the problem; e.g.,

  > data(presidents) # also a multivariate ts
  > p <- presidents
  > p + p
  > 3 * p

all work

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maechler@stat.math.ethz.ch writes:

> This is a SEVERE (new?) bug.
> 
> it's already visible as
> 
>   > z <- ts(matrix(1:48,ncol=2), start=c(1969,1), frequency=12);  z+z
>   Error: invalid time series parameters specified
Found and squashed (setting tsp attrib before dims on the result is a
bad idea, since tspgets checks with for consistency with nrows(vec)!).
Committed for 0.64.1.
> 
> Note that not all multivariate  ts show the problem; e.g.,
> 
>   > data(presidents) # also a multivariate ts
>   > p <- presidents
>   > p + p
>   > 3 * p
> 
> all work
Erm. That one isn't multivariate:
> dim(p)
NULL

It's just getting prettyprinted in 4 columns because it happens to be
quarterly data...

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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