Inversing a function, i.e: solving a function is often difficult or not possible.
Many pure functions or like pure functions will root-plot on the canvas [Mach].
Gaussian functions will need be specified piece wise.
NASA(h) will show something on the canvas as demonstrated. The three branches
generate some complex solutions, the complex sols won't plot thus the blanks.
1. The red branch is sufficiently pure to plot almost continuous.
2. The blue branch suffers more in the low range.
3. The green branch plays hide and show game ... but willing.
The discrete solver is the alternative, but you don't have an exportable
function-solution ... interpolate the discrete data solution.

If you have better alternative ... welcome ! Jean

Solve INVERSE NASAroots.sm (18 KiB) downloaded 52 time(s).

Hello Jean


I think the function you're looking for is the following:





Solve INVERSE NASAroots_CBG.sm (22 KiB) downloaded 66 time(s).


Best Regards


Carlos

Another possible solution





NasaData_Jean_CBG.sm (45 KiB) downloaded 64 time(s).


Best Regards


Carlos

Wrote

Hello Jean
I think the function you're looking for is the following:

Thanks Carlos ... will try fit in the low commercial range.
Up until now, J_Frac reconciliation in two segments.

Cheers ... Jean

Inst_ISA [km_kPa] solve NASA Reconciliate.sm (52 KiB) downloaded 57 time(s).

Wrote

Up until now, J_Frac reconciliation in two segments.

... refreshed a bit for 0 error @ sea level.

Inst_ISA [km_kPa] solve NASA Reconciliate.sm (52 KiB) downloaded 60 time(s).