Re: how to parse linear equations

[Hans Aberg]

On 16 Jan 2010, at 15:21, Michael Chen wrote:

> My goal is to get to the matrix form Ax =b by collecting and combining
> linear terms while I am parsing the ast tree. Once I get a clean
> matrix form Ax=b, it is straightforward to call my other routines to
> solve it.

It may be easier to first parse polynomial expressions, which is,  
since it is linear, the coefficients plus the constant. When the  
equality "=" appears, you can combine the two sides. WHen you have  
collected all equalities, build the matrix. This method then  
generalizes to polynomial equations, if you would like to do so later.

  Hans