Solving for equations the HP50, 49.. way.

[BruceH]

(03-23-2023 08:57 PM)Luigi Sardella Wrote:  Sure did I try the solver app; but I did not find it as useful as I would like. I have little use of ten equations, or expressions, named E1..E10. To be clear, let's suppose I want an equation for LC resonant circuits. With the RPN calculator I make so:

'freq = (1/pi) / sqrt(induct*capac)'
ENTER
'LC_eqn'
ENTER
SWAP
STO

and then I can use this equation inside a program, and solve it for one of its variables using ROOT; or I solve it with the solve_equation app.
Thanks for Your attention.

I entered the expression F=(1/pi)/sqrt(D*C) into the Solve app's symbolic view as E1, then pressed NUM and was presented with entry fields for F, D & C. I entered some random numbers and it solved away merrily.

Perhaps you hadn't created the variables you wanted to use (induct etc) in advance?

If you enter "0 Sto▸ induct" it will ask if you want to create the variable 'induct'. You can then use this in the E1 expression instead of D.

If you have more than 10 expressions then you can save a copy of the Solver app and so gain another 10 expressions. Repeat if more are required.