MATLAB: How to use the “scatteredInterpolant” function object which is present in MATLAB workspace inside Simulink Model

blockfunctioninterpretedMATLABscatteredinterpolantsimulink

How to use the "scatteredInterpolant" function object, which is present in MATLAB workspace inside Simulink Model?

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There is a block called 'Interpreted MATLAB Function' block, which can be helpful in your scenario. Following documentation link provides information on the block:

https://www.mathworks.com/help/releases/R2019b/simulink/slref/interpretedmatlabfunction.html

I have attached an example model 'scatterInterpolantObjRead.slx' (which uses the 'scatteredInterpolant' object created in MATLAB workspace) and MATLAB script 'scatterInterpolantObj.m' (which creates the 'scatteredInterpolant' object). Please execute the attached files in the following order:

Execute the 'scatterInterpolantObj.m' file
Run the Simulink model 'scatterInterpolantObjRead.slx'

The attached example demonstrates how to use the 'scatteredinterpolant' object in the MATLAB workspace in Simulink Model.

Related Solutions

MATLAB: How to set parameters in the MATLAB Function block in Simulink

In the Simulink model put a MATLAB Function block.

Double click on it to open the function in MATLAB Editor, and add additional parameters, e.g. "param1" to the function signature. Then in Editor tab under Simulink subtab click on "Edit Data" in order to open the Ports and Data Manager. Click on the new parameter, and in the General tab change the scope to be "Parameter", and click on "Apply" to save this

Then back in Simulink right click Mask > Create Mask, open "Parameters & Dialog" tab. On the left pane it shows "Controls", choose "Edit" control and drag it to "Dialog box" in the middle pane.

Change the name of this control to be the name of the parameter, e.g. "param1". Then set the default value and prompt, e.g. 1 and "Parameter 1". Click on "OK" at the bottom of the window to save this mask.

Now if you double click on the Function block, it will allow to change the default value for the parameter used in the block. You can go back to the source code of the block by clicking the arrow at the bottom left corner, should you wish to make further changes to the function itself.

For more information on adding parameter arguments, please see the documentation page in https://www.mathworks.com/help/simulink/ug/parameter-arguments-in-matlab-function-block-functions.html.

An example "function_block_parameters.slx" has been attached to this answer and the screenshot of the model is shown below.

MATLAB: How to implement a MATLAB class that simulates function syntax (like scatteredInterpolant)

You can achieve this behavior using operator overloading:

https://www.mathworks.com/help/releases/R2017b/matlab/matlab_oop/implementing-operators-for-your-class.html

Here is an example 'MyFunction' class that simulates a subset of the behavior of 'scatteredInterpolant' by using a private 'scatteredInterpolant' object and overloading the 'subsref' method.

% MyFunction.m
classdef MyFunction
    properties (Access = private)
        F
    end
    methods
        function obj = MyFunction(x, y, v)
            obj.F = scatteredInterpolant(x, y, v);
        end
        function B = subsref(A, S)
            if ~( ...
                    strcmp(S.type, '()') && ...
                    length(S.subs) == 2 && ...
                    isa(S.subs{1}, 'double') && ...
                    isa(S.subs{2}, 'double') && ...
                    all(size(S.subs{1}) == size(S.subs{2})) ...
                    ... % etc.
                )
                error('error: invalid index ...');
            end
            B = A.F(S.subs{1}, S.subs{2});
        end
    end
end

You can use 'MyFunction' as follows.

>> F = MyFunction([91; 13; 92], [64; 10; 28], [55; 96; 97])
F = 
    MyFunction with no properties.
>> F(1, 2)
ans =
    101.9511
>> F([1; 2], [1; 2])
ans =
    103.1101
    102.2278
>> F([1 2], [1 2])
ans =
    103.1101  102.2278

Note that you could implement the 'subsref' method to support multiple numbers and types of indices (as 'scatteredInterpolant' does).

https://www.mathworks.com/help/releases/R2017b/matlab/ref/scatteredinterpolant.html#bvkm1mh

Best Answer

Related Solutions

MATLAB: How to set parameters in the MATLAB Function block in Simulink

MATLAB: How to implement a MATLAB class that simulates function syntax (like scatteredInterpolant)

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