How do I solve this error in Parameter Setting for 2-D Lookup Table Block in Simulink?

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翼
翼 2024-7-24
评论： 翼 2024-7-25
I'm trying to create a surrogate model for vehicle dynamics in Simulink, but I'm encountering an error when setting parameters for the 2-D Lookup Table block. I would greatly appreciate any advice.
When executing the following code, this error occurs.
set_param([modelName '/SurrogateModel'], ...
'RowIndex', mat2str(throttleBreakpoints), ...
'ColumnIndex', mat2str(brakeBreakpoints), ...
'Table', mat2str(speedData));
Error message:
There is no parameter named 'RowIndex' in the Lookup_n-D block
I can't figure out how I can solve this kind of error.
I was wondering if you could give me a solution.
How should I modify the code?
Here is my matlab script to create the surrogate model.
Full Script
% Create a surrogate model for vehicle longitudinal dynamics
% Set model name
modelName = 'VehicleLongitudinalSurrogate';
% Create new Simulink model
new_system(modelName);
open_system(modelName);
% Input: Throttle position (0-100%)
add_block('simulink/Sources/In1', [modelName '/Throttle']);
set_param([modelName '/Throttle'], 'Position', [100, 100, 130, 130]);
% Input: Brake pressure (0-100%)
add_block('simulink/Sources/In1', [modelName '/Brake']);
set_param([modelName '/Brake'], 'Position', [100, 200, 130, 230]);
% Surrogate model (Lookup table)
add_block('simulink/Lookup Tables/2-D Lookup Table', [modelName '/SurrogateModel']);
set_param([modelName '/SurrogateModel'], 'Position', [250, 140, 350, 190]);
% Output: Vehicle speed (km/h)
add_block('simulink/Sinks/Out1', [modelName '/Speed']);
set_param([modelName '/Speed'], 'Position', [450, 160, 480, 190]);
% Connect blocks
add_line(modelName, 'Throttle/1', 'SurrogateModel/1', 'autorouting', 'on');
add_line(modelName, 'Brake/1', 'SurrogateModel/2', 'autorouting', 'on');
add_line(modelName, 'SurrogateModel/1', 'Speed/1', 'autorouting', 'on');
% Set lookup table parameters (simplified data)
throttleBreakpoints = 0:20:100;
brakeBreakpoints = 0:20:100;
speedData = [
120, 100, 80, 60, 40, 20;
100, 80, 60, 40, 20, 0;
80, 60, 40, 20, 0, 0;
60, 40, 20, 0, 0, 0;
40, 20, 0, 0, 0, 0;
20, 0, 0, 0, 0, 0
];
% Set parameters (this is where the error occurs)
set_param([modelName '/SurrogateModel'], ...
'RowIndex', mat2str(throttleBreakpoints), ...
'ColumnIndex', mat2str(brakeBreakpoints), ...
'Table', mat2str(speedData));
% Save and close the model
save_system(modelName, [modelName '.slx']);
close_system(modelName);
disp('Vehicle longitudinal dynamics surrogate model has been created and saved.');
Best,

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采纳的回答

Paul
Paul 2024-7-25
Ran in:
% Create a surrogate model for vehicle longitudinal dynamics
% Set model name
modelName = 'VehicleLongitudinalSurrogate';
% Create new Simulink model
new_system(modelName);
open_system(modelName);
% Input: Throttle position (0-100%)
add_block('simulink/Sources/In1', [modelName '/Throttle']);
set_param([modelName '/Throttle'], 'Position', [100, 100, 130, 130]);
% Input: Brake pressure (0-100%)
add_block('simulink/Sources/In1', [modelName '/Brake']);
set_param([modelName '/Brake'], 'Position', [100, 200, 130, 230]);
% Surrogate model (Lookup table)
add_block('simulink/Lookup Tables/2-D Lookup Table', [modelName '/SurrogateModel']);
set_param([modelName '/SurrogateModel'], 'Position', [250, 140, 350, 190]);
% Output: Vehicle speed (km/h)
add_block('simulink/Sinks/Out1', [modelName '/Speed']);
set_param([modelName '/Speed'], 'Position', [450, 160, 480, 190]);
% Connect blocks
add_line(modelName, 'Throttle/1', 'SurrogateModel/1', 'autorouting', 'on');
add_line(modelName, 'Brake/1', 'SurrogateModel/2', 'autorouting', 'on');
add_line(modelName, 'SurrogateModel/1', 'Speed/1', 'autorouting', 'on');
% Set lookup table parameters (simplified data)
throttleBreakpoints = 0:20:100;
brakeBreakpoints = 0:20:100;
speedData = [
120, 100, 80, 60, 40, 20;
100, 80, 60, 40, 20, 0;
80, 60, 40, 20, 0, 0;
60, 40, 20, 0, 0, 0;
40, 20, 0, 0, 0, 0;
20, 0, 0, 0, 0, 0
];
The block parameters in question are defined at Lookup Table Block Parameters
% Set parameters (this is where the error occurs)
%set_param([modelName '/SurrogateModel'], ...
% 'RowIndex', mat2str(throttleBreakpoints), ...
% 'ColumnIndex', mat2str(brakeBreakpoints), ...
% 'Table', mat2str(speedData));
set_param([modelName '/SurrogateModel'], ...
'BreakPointsForDimension1', mat2str(throttleBreakpoints), ...
'BreakPointsForDimension2', mat2str(brakeBreakpoints), ...
'Table', mat2str(speedData));
disp('Model created')
Model created
% Save and close the model
%save_system(modelName, [modelName '.slx']);
%close_system(modelName);
%disp('Vehicle longitudinal dynamics surrogate model has been created and saved.');

更多回答（1 个）

Image Analyst
Image Analyst 2024-7-24
There is no rowIndex or columnIndex for set_param. Why do you think there is?
https://www.mathworks.com/help/simulink/slref/set_param.html#btuf9mn-1-ParameterName
  1 个评论
翼
翼 2024-7-25
编辑：翼 2024-7-25
Thank you,
I see...but,
In case of my script code above.
After I set lookup table parameters (simplified data), I can't figure out how I should set parameters...
I'd like to know how I should modify.

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