thr3ads.net - R devel - [Rd] par help wrong: xlog & ylog (PR#497) [Mar 2000]

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wsi@gcal.ac.uk

2000-Mar-21 13:57 UTC

[Rd] par help wrong: xlog & ylog (PR#497)

Full_Name: 
Version: 1.0.0
OS: linux
Submission from: (NULL) (193.62.250.209)


    

?par lists and describes xlog and ylog, though these are obsolete. It does not
list
log. I found out about log from ?plot.defaults--so that help is OK.

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Torsten Hothorn

2000-Mar-21 14:11 UTC

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[Rd] is.null(list()) is FALSE ?

On R-1.0.0, debian GNU/Linux, 

R> is.null(list())
FALSE

conflicts with the help for ?is.null:

Examples:

     is.null(list())    # TRUE (not so in S)
     is.null(integer(0))# F
     is.null(logical(0))# F
     as.null(list(a=1,b='c'))

and, I would like is.null(list()) to be TRUE :-)

Torsten

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Peter Dalgaard BSA

2000-Mar-21 14:18 UTC

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[Rd] par help wrong: xlog & ylog (PR#497)

wsi@gcal.ac.uk writes:
> Full_Name: 
> Version: 1.0.0
> OS: linux
> Submission from: (NULL) (193.62.250.209)
> 
> 
>     
> 
> ?par lists and describes xlog and ylog, though these are obsolete. It does
not
> list
> log. I found out about log from ?plot.defaults--so that help is OK.
Not a bug, not obsolete, and works as documented:
> plot(1,log="y")
> par("ylog")    [1] TRUE


-- 
   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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Bill Simpson

2000-Mar-21 15:27 UTC

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[Rd] par help wrong: xlog & ylog (PR#497)

> Full_Name: 
> Version: 1.0.0
> OS: linux
> Submission from: (NULL) (193.62.250.209)
> 
> ?par lists and describes xlog and ylog, though these are obsolete. It does
not
> list
> log. I found out about log from ?plot.defaults--so that help is OK.Reading through ?par again, I see that xlog and ylog are "read only".
(I
initially thought xlog and ylog were obsolete because I could set them) I
don't find the help to be very clear:

ylog: R.O..  A logical value (see `log' in `plot.default').  See
          `xlog' above.

Instead of (see `log' in `plot.default'), why not have log listed here
in
the par help? Or is it an argument to plot()? In which case, why not list
it in the help for plot()? I find it hard to find info for plots because
this info seems to be spread out in several places

Bill


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Bill Simpson

2000-Mar-21 15:30 UTC

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[Rd] par help wrong: xlog & ylog (PR#497)

On 21 Mar 2000, Peter Dalgaard BSA wrote:
> wsi@gcal.ac.uk writes:
> 
> > Full_Name: 
> > Version: 1.0.0
> > OS: linux
> > Submission from: (NULL) (193.62.250.209)
> > 
> > 
> >     
> > 
> > ?par lists and describes xlog and ylog, though these are obsolete. It
does not
> > list
> > log. I found out about log from ?plot.defaults--so that help is OK.
> 
> Not a bug, not obsolete, and works as documented:True. True. Not documented in plot help. It is documented in plot.default.
Why not in par, where xlog and ylog are? I find it confusing.
> 
> > plot(1,log="y")
> > par("ylog")    
> [1] TRUE
Bill

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maechler@stat.math.ethz.ch

2000-Mar-21 16:05 UTC

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[Rd] par help wrong: xlog & ylog (PR#497)

>>>>> "Bill" == Bill Simpson <wsi@gcal.ac.uk>
writes:
    Bill> On 21 Mar 2000, Peter Dalgaard BSA wrote:

    >> wsi@gcal.ac.uk writes:
    >> 
    >> > Full_Name: 
    >> > Version: 1.0.0
    >> > OS: linux
    >> > Submission from: (NULL) (193.62.250.209)
    >> > 
    >> > 
    >> >     
    >> > 
    >> > ?par lists and describes xlog and ylog, though these are
    >> > obsolete. It does not list log. I found out about log from
    >> > ?plot.defaults--so that help is OK.
    >> 
    >> Not a bug, not obsolete, and works as documented:
    Bill> True. True. Not documented in plot help. It is documented in
plot.default.
    Bill> Why not in par, where xlog and ylog are? I find it confusing.

    >> 
    >> > plot(1,log="y")
    >> > par("ylog")    
    >> [1] TRUE

log is *not* a valid  par(.) argument, what makes you think it should be
documented there ?

  > par(log = "x")
  Warning message: 
  parameter "log" can't be set in: par(args) 

It *is* a valid argument to most(?) plot methods;
plot is the generic function, and the idea is that it only documents what
*ALL* plot methods have in common.  This is the reason that "log = .."
is
documented with the default  plot method, plot.default.

You might have a point:  We could (should we?) consider requiring a 
"log =" argument for *ALL* plot methods, and then have it 
documented and possibly even among the listed arguements (the "non
..." ones)
of the generic  plot.

Opinions?

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