I'm not sure if this as a bug or something I am doing wrong. It occurs
in both 2.7.0 and 2.6.2.
require("methods")
setClassUnion("OptionalPOSIXct", c("POSIXct", "NULL"))
setClass("TSmetax",
representation(serIDs="character", ExtractionDate="OptionalPOSIXct" ))
setGeneric("TSmetax",
def= function(x, ...) standardGeneric("TSmetax"))
setMethod("TSmetax", signature(x="character"),
definition= function(x, ...){
new("TSmetax", serIDs=x, ExtractionDate=Sys.time())
} )
> z <- new("TSmetax", serIDs="whatever", ExtractionDate= NULL)
> print(z)
An object of class "TSmetax"
Slot "serIDs":
[1] "whatever"
Slot "ExtractionDate":
NULL
Now if I make this an attribute of an S3 class an print, I get
> zz <- ts(1:10)
> attr(zz, "Meta") <- z
> print(zz)
Time Series:
Start = 1
End = 10
Frequency = 1
[1] 1 2 3 4 5 6 7 8 9 10
attr(,"Meta")
<S4 Type Object>
attr(,"serIDs")
[1] "whatever"
attr(,"ExtractionDate")
`NULL`
attr(,"class")
[1] "TSmetax"
attr(,"class")attr(,"package")
[1] ".GlobalEnv"
>
The `NULL` shows up i
shows up in the tex file generated by a vignette as
<soh>NULL<soh> which causes tex (pdftex) to throw an error.
(It also seems to mess up my mail tool, so I hope this goes through.)
Paul
====================================================================================
La version française suit le texte anglais.
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