Getting Simulink compile-time error "Grid inputs must be vectors or the output of MESHGRID" even though I don't get that error when I try testing those lines in MATLAB

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Kadhir 2022-10-23

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https://ww2.mathworks.cn/matlabcentral/answers/1833488-getting-simulink-compile-time-error-grid-inputs-must-be-vectors-or-the-output-of-meshgrid-even-tho

回答： Paul 2022-10-24

Hi everyone. I have a table of aerodynamic coefficients and I'm trying to interpolate within them and do a spline extrapolation outside of them. I am passing in the Mach number and Angle of attack to a MATLAB function block, and I'm passing that through interpn in the following way:

aero.Cmdh = interpn(params.aero.Cmdh.X, params.aero.Cmdh.Y, params.aero.Cmdh.V, Mach, alpha, "spline");

When I do this, I get the following error at compile-time:

"Grid inputs must be vectors or the output of MESHGRID. Error in '.../MATLAB Function'."

I'm assuming it's during compile-time because any breakpoints I put within the function are not triggered. However, when I open up an empty MATLAB file and run the line of code provided above, I don't get any errors, and get a reasonable output. Why is it that I don't get any errors in MATLAB but get errors in Simulink? How do I fix this issue? Any kind of insight would be greatly appreciated.