I think the current wikipedia discussion of this topic is not self consistent.
Earlier on the page, we see that 76 is interpreted as a stem of 7 and a leaf of 6, and 88 is interpreted as a stem of 8 and a leaf of 8. In the treatment of negative numbers, the stem for X is expressed as X/10, with non-negative integers rounded. But 76/10 rounded would be 8, and 88/10 rounded would be 9. If it were self consistent, I would be interested in how it treats numbers in the range i:12 Thanks, -- Raul On Thu, Mar 14, 2013 at 9:12 AM, km <[email protected]> wrote: > Negative numbers in stem and leaf plots are discussed here: > > http://en.wikipedia.org/wiki/Stem-and-leaf_display > > --Kip > > Sent from my iPad > > > On Mar 14, 2013, at 8:00 AM, Raul Miller <[email protected]> wrote: > >> I am not sure that negative numbers are consistent with stem and leaf plots. >> >> That said, you could use an existing mechanism by manipulating the >> numbers before handing them off. For example: >> >> fudge=: ] + 0&> * (_20 * 0 = 10&|) - 10 2&p. >> >> -- >> Raul >> >> On Wed, Mar 13, 2013 at 5:16 PM, Brian Schott <[email protected]> wrote: >>> Raul, >>> >>> This is what I got with your newer showStemLeaf. I apologize for the >>> poor rendering. Suffice it to say that my experiment with your newer >>> showStemLeaf is unsatisfactory, too, because _2 appears in the >>> stemplot as 8, not 2. Perhaps you were mislead by my use of the work >>> stem, when leaf might have been better. I think the 0 is a stem and >>> the 2 4 1 and 8 are leaves. Right? >>> >>> >>> showStemLeaf=: (}:@":@>:@*&10@expandStems@[ >>> ;":&>@expandLeaves)&>/@(>@{. ; <@{:)@|:@stemleaf@/:~ >>> showStemLeaf _2 4 1 8┌─┬─────┐ >>> │_│8 │ >>> │ │1 4 8│ >>> └─┴─────┘ >>> showStemLeaf 2 4 1 8 >>> ┌┬───────┐ >>> ││1 2 4 8│ >>> └┴───────┘ >>> >>> >>> >>> >>> -- >>> (B=) <-----my sig >>> Brian Schott >>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
