# difference equations

Hello all,

I was wondering about SAGE capabilities in solving coupled systems of difference equations; I don't see any z-transform capabilities so I think this may not be possible yet.

Ruy Lopez

Hi, I don't know what you mean by z-transform (Do you mean discrete fourier transform?), but you can solve coupled differential equations numerically in sage. Have a look at

http://ask.sagemath.org/question/162/...

See http://en.wikipedia.org/wiki/Z-transform for the z-transform (used frequently in discrete signal processing). Not seeking solutions to differential equations! I need to solve systems of coupled difference equations (the same wiki link describes difference equations too). Memory limitations in Mathematica and Maple, limit explicit solutions to about 4 coupled difference equations and I was hoping to solve 5 or more such equations with SAGE, after seeing some of it's capabilities on the benchmark page.

Oh sorry about that.

For exact solutions to difference equations, you may want to see whether Maxima has what you are looking for (which you could use directly or from within Sage).