Matlab Coder stop removing extraneous data

Is there a way to stop matlab from removing the extraneous data structures for inputs to functions? Basically I am passing a struct with 20 feilds to a function but currently only using 5. In future code I may end up using the other 15 and I want the generated C code to input the full 20 feilds instead of removing the extraneous feilds and only having 5 inputs. I want to pass the entire struct and not the seperate 5 feilds in the struct.

Answer 1

[Balavignesh]

Hi Eric,

I understand that when using MATLAB Coder to generate C code, it often optimizes the code by removing unusual fields from structures. However, if you want to to ensure that all fields in a structure are preserved in the generated C code, you can use the coder.cstructname function to enforce the inclusion of all fields, even if they are not used in the current MATLAB code.

Below is a brief demonstation on how you can do it:

% Define the structure with 20 fields
structDef = struct('field1', 0, 'field2', 0, 'field3', 0, 'field4', 0, 'field5', 0, ...
                   'field6', 0, 'field7', 0, 'field8', 0, 'field9', 0, 'field10', 0, ...
                   'field11', 0, 'field12', 0, 'field13', 0, 'field14', 0, 'field15', 0, ...
                   'field16', 0, 'field17', 0, 'field18', 0, 'field19', 0, 'field20', 0);

% Function definition
function myFunction(structInput)
    %#codegen
    % Preserve all fields in the structure
    coder.cstructname(structInput, 'MyStructType');

    % Your function implementation
    % For example, using only 5 fields currently
    result = structInput.field1 + structInput.field2 + structInput.field3 + ...
             structInput.field4 + structInput.field5;
end

Kindly have a look at the following documentation links to have more information on:

• 'coder.cstructname' : https://www.mathworks.com/help/simulink/slref/coder.cstructname.html

Hope that helps!

Balavignesh