R devel - Jul 2000 - plot.times error -- missing or illegal tck parameter (PR#601)

There seems no default setting for tck, causing problems
for plot.times()
> library(chron)
> dts <- dates(c("02/27/92", "02/27/92",
"01/14/92",
+                "02/28/92",
"02/01/92"))
> y<-chron(dts,out.format=c("dmy","h:m:s"))
> y
[1] 270292 270292 140192 280292 010292
> plot(y,1:5)
Error in axis(n, at = at.x, labels = labels, ...) : 
        invalid value specified for graphics parameter
"tck".
> plot(y,1:5,tck=0.01)
> traceback()
[1] "axis(n, at = at.x, labels = labels, ...)"                     
[2] "axis.times(1, x, simplify = simplify, labels = T, adj = adj, "
[3] "    col = col, cex = cex, font = font, las = las, lab = lab, "
[4] "    mgp = mgp, tck = tck)"                                    
[5] "plot.times(y, 1:5)"                                           
[6] "plot(y, 1:5)"                                                
> par()$tck
[1] NA


--please do not edit the information below--

Version:
 platform = Windows
 arch = x86
 os = Win32
 system = x86, Win32
 status = 
 major = 1
 minor = 1.0
 year = 2000
 month = June
 day = 15
 language = R

Windows 9x 4.10 (build 2222)  A 

Search Path:
 .GlobalEnv, package:chron, Autoloads, package:base

John Maindonald               email : john.maindonald@anu.edu.au        
Statistical Consulting Unit,  phone : (6249)3998        
c/o CMA, SMS,                 fax   : (6249)5549  
John Dedman Mathematical Sciences Building
Australian National University
Canberra ACT 0200
Australia


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>>>>> "JMd" == john maindonald
<john.maindonald@anu.edu.au> writes:
    JMd> There seems no default setting for tck, causing problems
    JMd> for plot.times()

    >> library(chron)
    >> dts <- dates(c("02/27/92", "02/27/92",
"01/14/92",
       +                "02/28/92", "02/01/92"))
    >> y<-chron(dts,out.format=c("dmy","h:m:s"))
    >> y
       [1] 270292 270292 140192 280292 010292
    >> plot(y,1:5)
         Error in axis(n, at = at.x, labels = labels, ...) : 
         invalid value specified for graphics parameter "tck".
    >> plot(y,1:5,tck=0.01)
    >> traceback()
         [1] "axis(n, at = at.x, labels = labels, ...)"
         [2] "axis.times(1, x, simplify = simplify, labels = T, adj = adj,
"
         [3] "    col = col, cex = cex, font = font, las = las, lab = lab,
"
         [4] "    mgp = mgp, tck = tck)"
         [5] "plot.times(y, 1:5)"
         [6] "plot(y, 1:5)"
    >> par()$tck
         [1] NA

Well, the default must be NA since   ?par says

 help_par>     tck: The length of tick marks as a fraction of the smaller of
the
 help_par>          width or height of the plotting region. If `tck=1',
grid
 help_par>          lines are drawn. The default setting is to use
`tcl=-0.5'
 help_par>          (see below).
 help_par> 
 help_par>     tcl: The length of tick marks as a fraction of the height of a
 help_par>          line of text.  The default value is `-0.5'.

which is different than other dialects of S on purpose!

So the bug is really in  plot.times only  which hasn't properly been
ported from S-PLUS to R.

Martin

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