# Re: st: A question on programming

 From "Quang Nguyen" To statalist@hsphsun2.harvard.edu Subject Re: st: A question on programming Date Wed, 21 Feb 2007 22:18:53 -1000

```Dear all,

There are some typos in the last email. I would like to repost it here:

Thanks to suggestions by members of Statalist, I developed the
following program:

program define sol
if "`1'" == "?" { /* if query call ... */
global S_1 "A B" /* identify parameters */
global X = 0.5 /* and initialize */
/* them */
exit
}
/* otherwise, calculate function */

replace `1' = a * exp(\$X) - b * (\$X)^2
set obs 1
gen y=1
nl sol y

end

This program aims at solving the equation: a*exp(X)=b*(X^2). Where a,
and b come from the following data set:

id        a          b
1         3          5
2         7          9
3         4          7

and so on.

My question is how I can integrate these values of a, and b into the
above program so that the value of X for each individual (ID=1, 2, 3
etc.,) can be solved automatically.

Thanks so much for your help!
Have A Wonderful Day!

On 2/21/07, Quang Nguyen <quangn@gmail.com> wrote:
```
```Dear all,

Thanks to suggestions by members of Statalist, I developed th
efollowing program:

program define sol
if "`1'" == "?" { /* if query call ... */
global S_1 "A B" /* identify parameters */
global A = 0.5 /* and initialize */
global B = 0.5 /* them */
exit
}
/* otherwise, calculate function */

replace `1' = a * exp(\$X) - b * (\$X)^2
set obs 1
gen y=1
nl sol y

end

This program aims at solving the equation: a*exp(X)=b*(X^2). Where a,
and b comes from the following data set:

id        a          b
1         3          5
2         7          9
3         4          7

and so on.

My question is how I can integrate these values of a, and b into the
above program so that the value of X for each individual (ID=1, 2, 3
etc.,) can be solved automatically.

Thanks so much for your help!
Have A Wonderful Day!
*
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*   http://www.ats.ucla.edu/stat/stata/

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