is it built in function or a structure ?

This is from the matalb documentation of reconfigurable intelligent surfaces. helperRISSurface is function or a structure ? how can i pass parameters?
i tried to rum this and i am getting error here. i have uploaded the screenshots
kindly help me

thank you.

=========================================================================
ris = helperRISSurface(‘Size’,[Nr Nc],’ElementSpacing’,[dr dc],…
‘ReflectorElement’,phased.IsotropicAntennaElement,’OperatingFrequency’,fc)
ris =
helperRISSurface with properties:

ReflectorElement: [1×1 phased.IsotropicAntennaElement]
Size: [10 20]
ElementSpacing: [0.0054 0.0054]
OperatingFrequency: 2.8000e+10
=====================================================================This is from the matalb documentation of reconfigurable intelligent surfaces. helperRISSurface is function or a structure ? how can i pass parameters?
i tried to rum this and i am getting error here. i have uploaded the screenshots
kindly help me

thank you.

ReflectorElement: [1×1 phased.IsotropicAntennaElement]
Size: [10 20]
ElementSpacing: [0.0054 0.0054]
OperatingFrequency: 2.8000e+10
===================================================================== This is from the matalb documentation of reconfigurable intelligent surfaces. helperRISSurface is function or a structure ? how can i pass parameters?
i tried to rum this and i am getting error here. i have uploaded the screenshots
kindly help me

thank you.

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