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

 From Miranda Kim To statalist@hsphsun2.harvard.edu Subject Re: st: Plotting several polynomials on the same graph Date Mon, 20 Jul 2009 09:04:16 +0100

```Thank you so much for your help with this!

Maarten buis wrote:
```
```--- 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

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

```
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```
```
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