Whats the correct way to remove all links (including appdata) to a serialport

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Jason 2020-1-8

编辑： Jason 2020-1-8

I often create a serial port object, s and save it from a button callback using

s = serialport('COM2',19200)
setappdata(0,'serial',s).

I understand using the new serialport there is no need for fclose(s).

Whats the correct way to clear up both the serialport object and the appdata (from a seperate button callback that created the serialport object)

Is it

S1=getappdata(0,'serial')
delete(S1) 
clear S1
rmappdata(0,'serial')

Thanks

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