Thanks, Vince; that's great.
--Nick W.
> -----Original Message-----
> From: Vince Wiggins, StataCorp [mailto:[email protected]]
> Sent: Tuesday, February 04, 2003 11:48 AM
> To: [email protected]
> Subject: Re: st: behaviour of xtick(##) and ytick(##) options
>
>
> Nick Winter <[email protected]>, using Stata 8, asks
> about getting a
> fixed number of unlabeled ticks between his labeled ticks,
>
> > [...] is there no longer any automated way to get Stata 8 to handle
> > axes the way Stata 7 did by default: that is, range from data min to
> > max, min and max labeled, with five tick marks evenly spaced from
> > min to max. The first two are easy, with the -xlab(minmax)- and
> > -ylab(minmax)- options.
> >
> > However, the tick marks aren't so easy, [...]
>
> In Stata 8 graphics, the positions of major labels and ticks, options
> [x|y]label() and [x|y]tick()), are specified over the whole
> range of the x- or
> y-axis. Minor labels and ticks, options [x|y]mtick() and
> [x|y]mlabel(), can
> also be specified at positions between the major and ticks
> using the #<#>
> rule, see -whelp axis_label_options-. Taking Nick's example,
> we can add three
> minor x-axis ticks, placing them equally spaced between the
> minimum and
> maximum labeled ticks, using the -xmticks- option,
>
> . sc mpg price , xlab(minmax) xmticks(##4)
>
> If Nick does not like that the minor ticks are shorter than
> the labeled ticks,
> he can specify their length with the suboption tlength(),
>
> . sc mpg price , xlab(minmax) xmticks(##4, tlength(scheme tick))
>
> That was a bit unfair. I used an undocumented feature of
> named styles that
> allows an indirect reference to settings in the current
> graphics scheme to be
> used in place a style name or explicit value. Most graphics
> schemes define a
> default major tick length and that length is defined under
> the name -tick-, so
> by specifying -tlength(scheme tick)- we were requesting the
> default major tick
> length specified in the current scheme file.
>
> Alternately, Nick could type
>
> . sc mpg price , xlab(minmax) xmticks(##4, tlength(tiny))
>
> to specify that the minor tick length is -tiny-, though
> settling on -tiny-
> might require some experimentation.
>
>
> -- Vince
> [email protected]
>
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