Convert a three 10x2 matrix into a 2D lookup table data

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Sandeep Nair
Sandeep Nair 2022-11-22
回答： Aditya Srikar 2023-5-26
I have a three 10x2 data in terms of a,b,c and i want to convert these data into 2D lookup table ie row should be a ,column should be b and the value to be lookup should be c,i tried doing interp2(x,y,z,xq,yq) but am getting an error of
Error using griddedInterpolant
Grid arrays must have NDGRID structure.
Can someone please help how to solve this issue
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Dyuman Joshi
Dyuman Joshi 2022-11-23
Alright. In that sense, what if the value is a=0, b=0.5. Which value of c should be interpolated?
Similarly for a=0, b=0.52, c=?
Sandeep Nair
Sandeep Nair 2022-11-24
Here the condition which arise is a=0.45 and b=1.5 ,the condition which you are saying will not arise i want to interpolate between the points of the matrix

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回答（1 个）

Aditya Srikar
Aditya Srikar 2023-5-26
To create a 2D lookup table where the rows are values of `a`, the columns are values of `b`, and the entries are values of `c`, you can use MATLAB's `interp2` function. Here are the steps to do this:
1. Create a grid of `a` and `b` values using the `meshgrid` function in MATLAB:
[a_grid, b_grid] = meshgrid(a_values, b_values);
2. Use the `interp2` function to interpolate the values of `c` on this grid:
interp_c = interp2(a, b, c, a_grid, b_grid, 'spline');
Here, `inter_c` is the interpolated value of `c` on the grid, and the `'spline'` option specifies cubic spline interpolation.
Make sure that the dimensions of `a`, `b`, and `c` are the same and that there are no NaN or Inf values in `a`, `b`, or `c`.

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