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From |
vwiggins@stata.com (Vince Wiggins, StataCorp) |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: graph yline() option |

Date |
Mon, 03 Feb 2003 18:10:46 -0600 |

Tom Steichen <STEICHT@rjrt.com> notes a difference in the behaviour of the graphics option yline() option under Stata 7 and Stata 8, > In Stata8... > > I added some ylines to a -graph box- using the -yline()- option, > wherein one of the values specified in -yline()- was slightly > outside of the range of the data being plotted. > > Rather than expanding the y range to include the line in the usual > graphics region (as Stata 7 does), Stata8 plotted the line in the > x-axis label area at a location that appeared to be correct had the > y-axis extended down that far. This is by design. Graphics in Stata 7 and before attempted to be parental and guess at what you meant by an option or specification, with the hope that the result would be pretty. In Stata 8 graphics our overriding rule has been to increase flexibility and let users specify exactly what they want, even though the result may be ugly. A large part of the flexibility in the new graphics comes from not trying to second guess the user, but rather directly render what is requested. I can certainly think of cases where I liked -graph- under Stata 7 automatically making and assumption, and that assumption was just what I wanted (Tom's example might usually fall in that category), but I can think of other cases where I simply could not get what I wanted because -graph- did something automatically that thwarted me. Tom can explicitly expand the range of the y-axis by specifying the option -yscale(range(# #))-, where either # may be "." to retain the default upper or lower axis bound. In designing Stata 8 graphics we considered making a rule that we avoid reusing any option name when the option did not behave in Stata 8 exactly as it did in Stata 7. The problem with that rule is that many of the Stata 7 option names are just too good, and we didn't want to lose them. We also felt that it was easier to adapt to an option whose behaviour was sometimes changed in Stata 8 than to learn a whole new set of options. -- Vince vwiggins@stata.com * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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