15c SOLVE question on usage

[lemontea]

(05-01-2014 02:40 AM)Tugdual Wrote:  You could use a trick using the I (index) register to define which of the 3 variables E,R,I is unknown (the 2 others should be known). But that looks a bit over engineered in my opinion.

I thought about that but it would just be a regular program and won't use the SOLVE function.

If the SOLVE function can't do it easily, then I guess I will have to just resort to regular programming, but it seems like a hassle just for short equations. I thought if SOLVE can help with that then it is OK to program short equations (a few lines).

To have program branching, etc. is a bit of a hassle (especially since the calculator does not use a full fledged programming language); I can standardize X Y Z registers as the variables (e.g., X is always voltage) and test to see which is a 0 value, and compute for that. But this is not really what I was hoping for, unless SOLVE doesn't work this way.