Re: st: -tmap- maps: why only 9 categories?

[Maurizio Pisati <maurizio.pisati@galactica.it>]

Dear Friedrich,
I originally chose to limit the maximum number of classes to 9 because most 
Brewer's graduated color palettes had a maximum of nine shades. However, 
I'm currently working on a completely rewritten version of -tmap- (which I 
will call -dmap-) that will allow a maximum of 16 different colors, 
depending on the specified classification method and color palette (no 
limit when option palette(Custom) is specified). -dmap- will also be more 
flexible and allow the user to draw more complex maps.
Best,
Maurizio


At 17.17 23/08/2006, you wrote:

> Choropleth maps created with -tmap- from SSC are limited to 9
> categories by default. Quote from the -tmap- help file: "clnumber(#)
> specifies the number of classes k in which the variable of interest
> quantvar should be divided. This option accepts only numbers between
> 2 and 9."
>
> I had to create a map with 10 classes and was able to do so by
> editing tmap_choropleth.ado in two places.
>
> Line 103: change "if r(r) > 9" to "if r(r) > 10"
> Line 110: change "inrange(`clnumber', 2, 9)" to "inrange(`clnumber',
> 2, 10)"
>
> I can only think of aesthetic reasons for a limit on the number of
> categories in a map. Is there also a technical reason for the 9-class
> limit of -tmap-? Could raising this limit cause problems with -tmap-
> or with Stata?
>
> Friedrich Huebler
>
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