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

 From David Airey To Statalist 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

```
```*
*   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/
```