Any ideas about solving an underdetermined system?

*To*: mathgroup at smc.vnet.net*Subject*: [mg58514] Any ideas about solving an underdetermined system?*From*: Zhengji Li <zhengji.li at gmail.com>*Date*: Tue, 5 Jul 2005 04:52:22 -0400 (EDT)*Reply-to*: Zhengji Li <zhengji.li at gmail.com>*Sender*: owner-wri-mathgroup at wolfram.com

Dear Mathematica ers, Mathematica has a method of given the mininum-length solution. Let (x1, x2, ...) be a solution, I want that there are as many X-es equal to 0. In other words, I want to solving a underdetermined system in which many unknowns might be 0. And if I known which ones are 0, then the system may be simplified to a overdetermined one. Any ideas?

**Follow-Ups**:**Re: Any ideas about solving an underdetermined system?***From:*Sseziwa Mukasa <mukasa@jeol.com>