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RE: Re: st: Plotting several polynomials on the same graph


From   David Airey <david.airey@vanderbilt.edu>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   RE: Re: st: Plotting several polynomials on the same graph
Date   Fri, 17 Jul 2009 20:30:33 -0500

.

Dang. That is tricky! Nice. I had this same problem and question today and got as far as your first solution. Thanks for this second solution.

-Dave

--- Miranda wrote:
> I wondered if there is any way of adding functions onto the same graph > using a separate command (on a separate line), so as to be able to loop > over these and superimpose several (i.e. instead of using the '||' in
> the 'twoway' command)

The trick is to create the graph command in a loop while storing it in
a local macro, like in the example below:

*---------------- begin example -------------------
input a b c
1 2  3
2 3  4
1 2 -3
2 3 -4
end

forvalues i = 1/4 {
	local gr "`gr' function y = a[`i'] + b[`i']*x + c[`i']*x^2"
	local gr "`gr', range(-3 3) ||"
}

twoway `gr'
*--------------- end example ----------------------

Hope this helps,
Maarten

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