Problem with interp3 - "Interpolation requires at least two sample points for each grid dimension."

Question

Joe Garrett 2022-3-31

0
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https://ww2.mathworks.cn/matlabcentral/answers/1685179-problem-with-interp3-interpolation-requires-at-least-two-sample-points-for-each-grid-dimension

回答： Ayush Modi 2023-10-9

I am trying use the interp3 function to interpolate between x3 variables; Angle of Attack, Reynolds number, & flap angle. These are contained within a excel spreadsheet. The code is used to find the coefficient of performance of a wind turbine at different tip-speed-ratios. The main body of the code works fine & I've used it before without the interp3. I have also used interp1 before & in a similar way without issues.

  CL=interp3(DATA(:,1),DATA(:,2),DATA(:,3),DATA(:,5),AOA,flap_Angle,Re); 
  CD=interp3(DATA(:,1),DATA(:,2),DATA(:,3),DATA(:,6),AOA,flap_Angle,Re);

I get the error message "Interpolation requires at least two sample points for each grid dimension."

I confused by this because the data I'm feeding in does have x2 points for Reynolds number & multiple for Flap angle & Angle of attack. So I'm not sure where I am going wrong.

Hopefully it's not something obvious I've missed! Any help would be grately appreciated.

Thank you, in advance, for your time.