How can I get the parameters of a MATLAB Function programmatically on command line

Hello,

I want to get all Inputs with scope 'Parameter' from a MATLAB Function block, but the following commands will only return the Inputs with scope 'Input':

S = sfroot;
B = S.find('Name','myBlockName','-isa','Stateflow.EMChart');
B.Inputs

In the following answer, it is described how to Change Inputs to Parameters so there also must be a way to access these.

http://www.mathworks.com/matlabcentral/answers/100659-how-do-i-set-user-defined-parameters-in-an-embedded-matlab-function-block-from-the-matlab-command-pr

Thanks in advance, Philip

Answer 1

[Roman Luz]

I wanted to access all the MATLAB Functions to find any function parameters that may have unchecked the Tunable checkbox.

I couldn't automate this as I'd hoped. The best I could do was find MATLAB Functions and list their parameter variable names. This turned out to be useful enough in my case, because about 60% of the blocks could be ignored since they didn't have any parameters at all. For the other 40% I still had to manually navigate through each parameter's setting in the Ports and Data Manager GUI.

I wish I could get handles to these parameters and query if they were Tunable.

I'm using R2020a.

mdl_systems = gcs();
search_depth = 99;
find_options = {'FindAll','on', 'LookUnderMasks','all',...
    'FollowLinks','on','LookInsideSubsystemReference','on', ...
    'LoadFullyIfNeeded','on', 'Variants','ActiveVariants', ...
    'IncludeCommented','on', 'SearchDepth',search_depth};

bd = get_param(mdl_systems, "Object");
matlab_subsystems = find_system(mdl_systems, find_options{:}, 'SFBlockType','MATLAB Function');
for b = 1:length(matlab_subsystems)
    matlab_subsystem = find(bd, 'Handle',matlab_subsystems(b));
    params = get_MATLABFunction_parameters(matlab_subsystem);
end

function params = get_MATLABFunction_parameters(mfun)
    childs = mfun.getChildren();
    sfun = find(childs, 'BlockType','S-Function');
    params = get(sfun, 'Parameters');
end

[Mark Tucker]

I couldn’t quite get Roman's code to work but a few modifications allowed me extract all the parameters used by Matlab Functions in a model.

NumberMatlabFunctionParameters = 0;
MatlabFunctionBlocks = find_system(ModelName, 'FollowLinks','on', 'SFBlockType','MATLAB Function');
for ii=1:length(MatlabFunctionBlocks)
    MatlabSubsystem = find(slroot, '-isa', 'Stateflow.EMChart', 'Path', MatlabFunctionBlocks{ii});
    if ~isempty(MatlabSubsystem)
        Children = MatlabSubsystem.getChildren();
        for jj=1:length(Children)
            if strcmp(Children(jj).Scope,'Parameter')
                NumberMatlabFunctionParameters = NumberMatlabFunctionParameters+1;
                Parameter{NumberMatlabFunctionParameters} = Children(jj).Name;
            end
        end
    end
end
Parameter = unique(Parameter);

[Roman Luz]

Thanks! This is helpful.

Answer 2

[Paul]

For a specific Matlab Function block, as asked in the question (I have a simple Matlab Function block in my model with one input, one output, and one parameter).

S = sfroot;
B = S.find('-isa','Stateflow.EMChart','Path',gcb);  % gcb if the block is selected, otherwise use the standard, full path name
C = B.getChildren;
get(C,'Scope')

ans =

  3×1 cell array

    {'Input'    }
    {'Output'   }
    {'Parameter'}
    

So the third element of C is the parameter and C(3) will reveal its properties.

[Roman Luz]

I finally found the Tunable setting! Thanks for the help.