Why I cannot use 64 Bit datatype in Stateflow with MATLAB Action Language in R2020a?

Why I cannot use 64 Bit datatype in Stateflow with MATLAB Action Language in R2020a?

I have a Simulink Parameter with int64 datatype and now in the Diagnostic Viewer I can see the following error:

'paramChartInt64' has a value of an unsupported type.'

In R2019a and R2019b there was no error.

I use the following code to specify the parameter:

paramChartInt64 = Simulink.Parameter;
paramChartInt64.DataType = 'int64';
paramChartInt64.Value =1;

Answer 1

[MathWorks Support Team]

In R2019a and R2019b we unintentionally allowed to use 'int64' datatype in Stateflow charts. This was fixed in R2020a and now it correctly shows an error, because it is not supported.

Our development team currently plans to include this functionality in a future release.

In the meantime you can use the following workaround:

paramChartInt64 = Simulink.Parameter;
paramChartInt64.Value = fi(-1, 1, 64, 0);

64-bit datatypes are allowed in Stateflow starting in R2021a and are represented as a standard builtin type (not a fixed type alias).