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

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,

Answer 1

[Paul]

% 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.');

[翼]

Thank you.

I solved it !

Answer 2

[Image Analyst]

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

[翼]

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.