2D function contruction

Question

mortain 2016-3-17

0
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https://ww2.mathworks.cn/matlabcentral/answers/273987-2d-function-contruction

关闭： MATLAB Answer Bot 2021-8-20

Hello, I had scattered data from 3 experiments. The tests measure voltage and flow rate for three different geometries. I have two matrices: if true % code

Flow = [19.05 27.13 34.08 40.48 45.00 49.65 20.55 26.39 34.22 39.44 45.53 49.96 19.88 26.47 33.20 40.04 44.78 49.49];

Voltage = [4.26 4.55 5.23 5.90 6.55 7.27 4.13 4.25 4.32 4.49 4.8 5.2 4.1 4.14 4.21 4.30 4.40 4.50];

geo = [22.5,45,90]; end

I would like to create a function that, given a new value of geo and Flow gives back the voltage. I think it could be an easy thing to do.

I tried with scatteredinterpolant, but didn't succeed in building the interpolant. It keeps giving an error about matrix size, tbh I don't really understand how the input matrix need to be.

I tried with fitlm quadratic, but the values predicted values do not correspond to the original ones (a difference between experiment and model up to 20%)

Would you have any suggestions, please?

Thanks