The error message "Illegal use of a matrix or vector type where a scalar was expected" typically occurs in Stateflow when you attempt to use a matrix or vector in a context where only a scalar is allowed. This can happen in various situations, such as in state transitions, conditions, or actions. Here are some steps you can follow to resolve this error:
- Verify the type of input being passed to the source chart. If it is in the form of a matrix or vector, try to pass it as a scalar with respect to time steps.
- Ensure that the variables used in conditions and transitions are of the correct type. For example, if a condition expects a scalar value, make sure you are not passing a matrix or vector.
- Check how variables are initialized in the Stateflow charts. Ensure that the initialization does not ichange the expected type of the input from scalar to matrix.
- Adjust the Stateflow chart to accommodate the correct type of variables. Ensure that all variables are used appropriately as scalars where required.
- Utilize the debugger to step through the chart and inspect variables, transitions, and state conditions. This can help you identify the root cause of the issue.
You can refer to the following MATLAB Answers for guidance:
- https://www.mathworks.com/matlabcentral/answers/730658-illegal-use-of-a-matrix-or-vector-type-where-a-scalar-was-expected-error-in-simulink
- https://www.mathworks.com/matlabcentral/answers/1712740-illegal-use-of-a-matrix-or-vector-type-where-a-scalar-was-expected-in-stateflow
I hope this helps you!
