Simulink Block IO signal data type reference inside the fcn block

Dear experts,

Just wondering if it is possible to reference I/O data type specified in "Edit Data" inside a fcn block, while doing value assignment.

For example, input "u" is defined as "fixdt(1,9,0)" in "Ports and Data Manager". Currently I have to do this explicitly: "u = fi(3, 1, 9, 0)" if I wanna say "u=3".

I am thinking it will be convenient if I could just do "u = fi(3, numerictype(u))".

Thanks,

[Kaustubha Govind]

Using "u = fi(3, numerictype(u))" works for me. Are you seeing an error?

[legendbb]

'u = fi(3, numetictype(u))'

Error: Undefined function or variable 'u'. The first assignment to a local variable determines its class.

'u' is defined as fixdt(0,3,0) in Ports and Data Manager.

[legendbb]

I tested moving the fcn block into a different model, and found out, if the input signal is set to Type = "Inherit: Same as Simulink" the numerictype can be dereferenced inside the fcn block, but not from explicit definition in side 'Ports and Data Manager'.

[Kaustubha Govind]

legendbb: It works for me both when the input type is set to "Inherit" or when it is explicitly specified. What error do you get in the second case?

[legendbb]

Hi, Kaustubha,

Thanks for your comment.

I am not able to reproduce the same error, after rewriting all those functions to 'u=fi(3,numerictype(u))' and redesign the whole block.

But clearly previous error of 'u=fi(3,numerictype(u))" is

Error: Undefined function or variable 'u'. The first assignment to a local variable determines its class.

Please leave this ticket here for notes, it might come back and I will update it here.

Thanks,

[Kaustubha Govind]

"Error: Undefined function or variable 'u'. The first assignment to a local variable determines its class." - this means that "u" is not defined as ta local/input variable in the function. I assumed "u" was your input because you posted the 'u=fi(3,numerictype(u))' line originally as a desirable syntax.

[legendbb]

Hi, Kaustubha,

Originally, I might confused myself by trying to reference data type for output. I knew for sure it generates the abovementioned error, if I define explicitly data type for "output y" and try to reference its data type inside fcn code, for instance:

function y = f(u)

reg_y = fi(0,numerictype(u));

y = reg_y;

end