# SciDAVis. Art of approximation

A possible real application could be weight sensor modeling.

Think you have one weight sensor, a device able to transform pressure into electrical signals; but informations about it aren't enough so you don't know how many volts per weight it returns, or more commonly its generated electrical signals pass through another electronic device that internally transforms them in a scaled value.

Your only salvation is to characterize the sensor making more and more measures; adding progressive weights, you test with a simple multimeter how many (milli) volts go out.
Well... you picked many values couples up, have to rebuild the behavior or function, but you're not so experienced in doing it or maybe the measuring job has destroyed you.

Good... use your last strengths to put these values into a SciDAVis 2-columns table; long but safe, and you will be pretty sure about final result, which is on your left - first picture.

What do you see here? a starting curve become a line, more or less from 1300 to 8500 on X axis.

Want to characterize only the line, to simplify your device's behavior?
Do same passages but excluding first values couples generating the curve.
Now plot Y-column, and from Analysis menu go to Quick Fit -> Fit Polynomial; press Fit button, having care to check "Show Formula on Graph" as in previous picture: an function by interpolation will be shown on top left.
That's all.

Here 2 SciDAVis projects with tables and graphs ready.

Hope your curiosity about SciDAVis has born, that i showed you like a funny toy; it's indeed a powerful tool - like many others - to model mathematical, chemical, physical, medical, engineering, economical and others problems where mathematics could be applied.
But starting it as a game will ease the approach to SciDAVis.

As always, see you on next article!