How to programmaticaly set storage class (2020a) in Data Store Memory ?

Hi, I use Matlab 2020a.

I have hundreds of Data Store Memory Block that i generate on the Simulink model from an external file (Excel).

I've got a custom package ('mypackage') and a custom storage class within this package ('DataStore').

It works when i do it manualy.

What i want to do is setting by command line the package 'mypackage' with my storage class 'DataStore' into my data store memory block. It works when i do it manualy. To do that, i tried:

1) set(DSM_Block, 'StateSignalObject', mypackage.Signal)

--> It gives back:

"Invalid input for argument 1 (rhs1):

Value must be 'matlab.mixin.SetGet'.

Error in Simulink.DataObject/set"

2) a=get(DSM_Block_with_good_package, 'StateSignalObject')

set(DSM_Block, 'StateSignalObject', a)

--> It gives back:

"Invalid input for argument 1 (rhs1):

Value must be 'matlab.mixin.SetGet'.

Error in Simulink.DataObject/set"

And if i only write "set(DSM_Block,'StateStorageClass', 'DataStore');",

--> it gives back

"Invalid setting in DataStoreMemory block 'My_Bus' for parameter 'StateStorageClass'

Caused by:

'DataStore' is not a valid storage class"

Can you please help me ?

Answer 1

[Fangjun Jiang]

if "DSM_Block" is a block handle, you can use get/set

if "DSM_Block" is a block path, use set_param/get_param

[Jean Matthieu]

That's exactly what i do, but as the question's decriptor says, it doesn't work. It specificaly does not work with 'StateSignalObject' because of the errors mentionned in the description.

[Fangjun Jiang]

I tried it in R2020a. It seemed that way. It might have some dependency but hard to experiment.

I usually do it in a different way. You have hundres of DSM blocks. Each must have a unique data store name (the default is "A", for example). You need to create a signal object in base workspace or data dictionary

A=mpt.Signal and then set whatever property/value pair.

In the block, check "Data store name must resolve to Simulink signal object" option

command line is set_param(BlockPath,'StateMustResolveToSignalObject','On')

This way, the properties that you want to set are all linked to that sigal object.

This is a better way to manage the DSM blocks.