lookup table error in simulink

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vishnuvardhan naidu tanga
编辑： Johannes Lips 2025-2-28
Hello I am trying to model a 2D lookup table in simulink. I am calling the break points and table data from workspace. When i run it it shows an error as "the number of dimensions specified by the 'Table data' parameter (1) must match the 'Number of table dimensions' parameter value (2)." but when I check the table dimensions are table data: 1x9000 and break point 1 : 1x9000 and break point 2: 1x9000 all are same. But still I am getting this error. Please guide me through it.

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回答（2 个）

Sai Sri Pathuri
Sai Sri Pathuri 2020-6-2
Check whether you have set Number of table dimesions to 1, since your data is one-dimensional
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vishnuvardhan naidu tanga
vishnuvardhan naidu tanga 2020-6-2
yes i run the code. when i run the code the break points are updated from the data base. the error marks in break points are eliminated. But the system wont run because of the following error:
In block 'SH', the number of dimensions specified by the 'Table data' parameter (1) must match the 'Number of table dimensions' parameter value (2).
Sai Sri Pathuri
Sai Sri Pathuri 2020-6-2
Set Number of table dimensions (I highlighted it in above screenshot) to 1 in the dialog box, because your input is one-dimensional

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Johannes Lips
Johannes Lips 2025-2-28
编辑：Johannes Lips 2025-2-28
The problem, which was not properly addressed in the previous answer, is the table data itself, not the dimensionality parameter.
For the 2D lookup table, you ought to use a row vector of length n1 for breakpoints 1, a row vector of length n2 for breakpoints 2, and a 2D matrix with size n1 x n2 for the table data.
Preprocessing (reshape or interpolate) of the 1x9000 data of this question is necessary to obtain the required inputs for the 2D lookup table block.
rangeX1 = %choose based on data e.g. min(x1):stepx1:max(x1)
rangeX2 = %similar
[X1grid, X2grid] = meshgrid(rangeX1, rangeX2);
% Create the scattered interpolant for your original data
F = scatteredInterpolant(x1, x2, y, 'linear', 'none');
% Evaluate the function on the grid
Ygrid = F(X1grid, X2grid);
Then use rangeX1, rangeX2 and Ygrid for the breakpoints and table data.

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