[R] possible error in stem() function?

[Zibeli Aton]

Thanks, Duncan.  I hadn't even noticed that there were no odd stems - makes perfect sense now.

--------------------------------------------
On Mon, 8/29/16, Duncan Murdoch <murdoch.duncan at gmail.com> wrote:

 Subject: Re: [R] possible error in stem() function?

 Date: Monday, August 29, 2016, 4:09 PM

 On 29/08/2016 1:42 PM,
 Zibeli Aton via R-help wrote:
 > Using
 R-3.3.1 on Linux I seem to sometimes get inaccurate
 stem-and-leaf plots using stem.  For example:
 >
 >> x <-
 c(479,482,487,493,494,494,495,496,497,498,498,499,503,504,507,507,508,
 > +             
    510,511,512,514,516,520,524,525,525,527,534,536,542,545,546,547,549,
 > +             
    557,559,561,561,563,563,567,568,569,570,572,578,584)
 >> stem(x)
 >
 >   The decimal point is 1
 digit(s) to the right of the |
 >
 >   46 | 9
 >   48 | 27344567889
 >   50 | 3477801246
 >   52 | 0455746
 >   54 | 2567979
 >   56 | 1133789028
 >   58 | 4
 >
 > This plot is
 inaccurate since there are no values 469, 483, 484, etc. in
 the data.

 There's a
 479, and a 493, etc.  Since you only have even numbered
 stems 
 you get two decades of leaves on each
 line.  The ones for the 460's 
 would
 precede the ones for the 470's if there were any; you
 can see that 
 does happen in that the
 480's do precede the 490's.

 Duncan Murdoch

 >
 > If I remove one value from the input, then
 the result appears correct:
 >
 >> x <-
 c(479,482,487,493,494,494,495,496,497,498,498,499,503,504,507,507,508,
 > +             
    510,511,512,514,516,520,524,525,525,527,534,536,542,545,546,547,549,
 > +             
    557,559,561,561,563,563,567,568,569,570,572,578)
 >> stem(x)
 >
 >   The decimal point is 1
 digit(s) to the right of the |
 >
 >   47 | 9
 >   48 | 27
 >   49 | 344567889
 >   50 | 34778
 >   51 | 01246
 >   52 | 04557
 >   53 | 46
 >   54 | 25679
 >   55 | 79
 >   56 | 1133789
 >   57 | 028
 >
 > Is there a limit to
 the length of the input argument, a bug in the function, or
 something I'm missing?
 >
 > Thanks.
 >
 >
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