# [R] possible error in stem() function?

Zibeli Aton zibeli at yahoo.com
Tue Aug 30 02:31:18 CEST 2016

```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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>

```

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