MATLAB: Do I get an assertion failed error when I try to set the input argument types in a project using MATLAB Coder 2.2 (R2012a)

matlab coder

I am trying to define data types for input arguments to my entry-point function using ‘Define by example’ or by using the ‘Autodefine types’ option. Either way I get an error message similar to:

 Type conversion failed at <SNIP> Assertion failed.

Best Answer

The error is caused when the examples used to define the data type are not valid. A scalar [1x1] structure whose fields are not scalar is invalid. For example, the following [1x1] structure ‘testStruct’ cannot be used to define arguments for code generation as the field ‘fieldB’ is not scalar.

 testStruct = 
     fieldA: 0
     fieldB: [21x1 struct]

The workaround is to instead use an array of structures.

Related Solutions

MATLAB: Matlab change structure field name by comparing it with a list of conversions

Mustahsan - to be clear, you have a struct with a number of fields. If any of those field names appear in column 1 of your labellist.mat file, then you want to replace that field name with that in column 2. Is that is correct, then you can try the following. Suppose you have a cell array of field names and their replacements (read from your file) as

 namesArray = {'fieldA' 'fieldANew' ; 'fieldB' 'fieldBNew' ; 'fieldC' 'fieldCNew'};

and a struct like

 myStruct = struct('fieldA',0,'fieldB',1,'fieldD',42);

where

 myStruct = 
    fieldA: 0
    fieldB: 1
    fieldD: 42

We can then create a list of the fields in the structure, iterate over each one and replace where necessary

 structFields = fields(myStruct);
 for k=1:length(structFields)
     fieldName = structFields{k};
     % find the index of this field name in the first column of namesArray
     idx = find(strcmp(namesArray(:,1),fieldName));
     if ~isempty(idx)
         % field name exists so get the replacement
         newFieldName = namesArray{idx,2};
         % create the new field
         myStruct.(newFieldName) = myStruct.(fieldName);
         % remove the old field name
         myStruct = rmfield(myStruct,fieldName);
      end
 end

And the field names in myStruct are replaced

 myStruct = 
       fieldD: 42
    fieldANew: 0
    fieldBNew: 1

MATLAB: Do I get an error in MATLAB Coder 2.2 (R2012a) when instantiating an Enumerated data type with an Enumerated data type as its argument

The ability to instantiate an Enumerated data type with another Enumerated data type as an argument is currently unsupported in MATLAB Coder 2.2 (R2012a).

As a workaround, please use either of the following statements:

x = MyEnum(2);
x = MyEnum.Error;

Best Answer

Related Solutions

MATLAB: Matlab change structure field name by comparing it with a list of conversions

MATLAB: Do I get an error in MATLAB Coder 2.2 (R2012a) when instantiating an Enumerated data type with an Enumerated data type as its argument

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