How to get underlying numbers of enumeration?

I have a custom enumeration data type such as the one defined in the code below. How can I get the underlying integer values that comprise the type (i.e., [0,1,2])?

Simulink.defineIntEnumType('BasicColors', {'Red', 'Yellow', 'Blue'}, [0;1;2])

The getEnumTypeInfo function does not provide this information. The class metadata provides the EnumerationMemberList, but not the numerical values. Is there any other way?

Answer 1

[Fangjun Jiang]

Simulink.defineIntEnumType('BasicColors', {'Red', 'Yellow', 'Blue'}, [0;1;2]);
a=BasicColors.Blue;
a.real

[Monika Jaskolka]

This works for one enumeration value. How can I get all the int values for the type, while also taking into account that some enumerations can be discontinuous (e.g. [0;1;2;10;20])?

[Fangjun Jiang]

m=enumeration('BasicColors')
real(m)

[Jonas]

This does not seem to work for me. I have created an Simulink.Enumeration called 'ALM_A' in a Data Dictionary, and then copied it to the Base Workspace.

Now i want to get the enumeration value for the entries in this object in MATLAB.

I have tried

ALM_A.STOP

but it returns:

Unrecognized method, property, or field 'STOP' for class 'Simulink.data.dictionary.EnumTypeDefinition'.

When I request 'ALM_A', it returns the enumeration entries, but not the values:

ALM_A = 
   Simulink.data.dictionary.EnumTypeDefinition
      NULL
      RESET
      NOTIFY
      STOP

I have tried finding the possible commands to use on an enumeration type but could not figure it out. I have requested methods(ALM_A) and found some functions, but not yet a way to get the enumeration value from an entry.

I have attached the Simulink.Enumeration object to this message.

Many thanks,

Jonas

[Fangjun Jiang]

When you define a class, you need to run a .m file or run Simulink.defineIntEnumType() to have it established first in the memory. Your "ALM_A" is a Simulink.data.dictionary.EnumTypeDefinition, it needs to be used in the context of a data dictionary.

Here is what I did.

Load the .mat file

run "daexplr" in Command Window, File, New, Data Dictionary

Drag "ALM_A" from base worksapce to the data dictionary

Click menu Add, MATLAB Variable, Specify the value of "Var" as "ALM_A.NULL"

Drag "Var" from data dictionary to base workspace

type "Var" or "ALM_A.STOP" in Command Window

[Jonas]

Like magic. Really clever! Never would I found this out.

Thanks a lot!

Jonas

[riccardo]

I'm using 2020a.

Once you have an EnumTypeDefinition object in the main workspace, one of the properties is "Enumerals".

>> enumDefList = <enumTypeDefObject>.Enumerals;

will return in "enumDefList" a structure array holding Name, Value and Description of the enumerated type.

Alternatively, if you define the object in Matlab:

>>Simulink.defineIntEnumType( 'tryEnum01', { 'AA', 'BB', 'CC', 'KK' }, [0, 2 , 4, 6] )

using enumeration you extract the arrays of enumerated definitions and labels :

>> [ gg, hh ] = enumeration( 'tryEnum01' );

scalar-expanding the enumerated definitions "gg" within a cast to double:

>> indexes = double( gg(:) )

indexes =

0

2

4

6

<<

If you want just the numerical values, then

>> indexes = double( enumeration( 'tryEnum01' ) )

indexes =

0

2

4

6