TI89 calculator solver in functions?

[jzmaster]

I was wondering if it's possible to use the TI89 Titanium's built-in solver with programs. More specifically, for compressible flow problems, I'd like to calculate mach number based on area ratio, specify whether the flow is subsonic or supersonic, then do something with the corresponding value.

Sadly, the "solve(" function returns text which is useless for manipulating the value (for example, taking the minimum)

Thanks in advance for any help.

 

[jzmaster]

I solved this problem myself. Here's what I did:
the "solve(" function returns text no matter what you do. The only useful function is "nSolve(". Unfortunately, nSolve will give whatever value it finds first which satisfies the equation, and doesn't search for other values. It is still useable in this case though:
by using "nSolve(function,variable) | variable < value", I can restrict nSolve's solution to a specific domain. By doing so, I can get the value in the region I'm interested in (in this case, subsonic flow, I'd type "nSolve(A/A* function,variable) | variable < 1" for subsonic, or "... | variable > 1" for supersonic.