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From |
Maarten buis <maartenbuis@yahoo.co.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Plotting several polynomials on the same graph |

Date |
Fri, 17 Jul 2009 08:23:33 +0000 (GMT) |

--- On Fri, 17/7/09, Miranda Kim <mk@mrc.soton.ac.uk> wrote: > I have three variables that hold coefficients for > polynomials (such that each row contains three coefficients > for a simple polynomial y=a+bx+cx^2). I want to draw all > polynomials (10 rows) on the same graph. > > Then (if possible) I have three variables that hold three > points that lie on the graph (each row contains three points > that lie on the polynomial that is defined by the > coefficients on that row), I’d like to plot these too (on > the same graph). Does this solve your first question? *-------------- begin example ------------------- input a b c 1 2 3 2 3 4 end twoway function y = a[1] + b[1]*x + c[1]*x^2, /// range(-3 3) || /// function y = a[2] + b[2]*x + c[2]*x^2, /// range(-3 3) *---------------- end example ------------------- I don't understand the data structure involved in your second question: a point on that curve should be defined by two values: and x coordinate and a y coordinate. If you have those you can use -scatter- as an overlay plot within the example I gave above. You could also consider the -xline()- or -yline()- options. Hope this helps, Maarten ----------------------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://home.fsw.vu.nl/m.buis/ ----------------------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Plotting several polynomials on the same graph***From:*Miranda Kim <mk@mrc.soton.ac.uk>

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