DB48X: HP48-like RPL implementation for DM42

[c3d]

(Today 05:16 AM)nickapos Wrote:  Hi Christoph,

Thanks for the presentation it’s a great overview of the design philosophy and a show case of the functionality and the features. I have a question
I am trying to set up the following equation "'2*π*F*L=1/(2*π*F*C)'"
It works ok with one exception. π is not recognised as the constant, instead it is being recognised as a variable and the silver expects me to provide a value.

Is there anything special I need to do to indicate this is a constant?

Yes. As you saw from the app, constants have a special marker, that shows up as a white on black [cst]. This is unicode character Ⓒ, so the constant for π must be written Ⓒπ in the files. You can copy/paste that from the simulator as I just did.

The rationale for constants requiring a prefix was that I did not want names like R, c or N to clash with variable names. I did consider making an exception for π and there is an exception for ⅈ due to the parsing of complex numbers.

Quote:When I edit this equation in the app itself I see that pi is defined as cst π and it becomes bold in the equation but how do I transfer that to the equations file?

I hope that the above helps.

Also please consider adding the proper unit to the variables. You need to do that only once per variable in a given equation. You need to put parentheses around the unit to avoid ambiguity with * and / .

Now, your particular equation looks like a resonant frequency, and this is already a system in the equation library called Resonant Frequency under Electricity. Specifically, this is the current system (illustrating the use of units I was referring to):

{
'Qs=1÷(R_Ω)·√((L_mH)÷(C_μF))'
'Qp=(R_Ω)·√((C_μF)÷(L_mH))'
'(ω0_r/s)=2·(Ⓒπ_r)·(f0_Hz)'
'(ω0_r/s)=(1_r)÷√((L_mH)·(C_μF))'
}

The help for that equation is not written yet I believe, though this may be in the patches that Jean Wilson submitted that I did not integrate yet.