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I have a sensor going into a microcontroller via a adc.

I have worked out the conversion from the adc value into real terms.

Now the math takes too long in code to run this. and a look up table with 1024 elements will fill my program memory very quickly.

So I have put the results into excel, and the graph has come up as a "S" shape, Now I believe this is a cubic graph, but my confusion lies that a general google search shows cubic graphs as backwards N shape, where as mine looks to be spun around by 90 degrees.

So,

1: is the graph I have, Cubic, or something else?

2: how can I work out the formula (a^3 + b^2 + c) from points in my graph?

Thanks

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# Cubic graphs to equation confusion

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