Unable to resolve the name phased.internal

I am currently using the Matlab version R2021a and I am trying to run the "Pedestrian and Bicyclist Classification Using Deep Learning" example from Matlab. An error was raised at line 287 of backscatterPedestrian.m file ("Unable to resolve the name phased.internal.getHumanBodyParts."). I have tried to find some document about internal attribute but I cannot find anything related.

This is exactly what i see when i try to excute the example file:

Unable to resolve the name phased.internal.getHumanBodyParts.

Error in backscatterPedestrian (line 287)

[obj.pBodyPartsJointsInitialPosition,~] =

phased.internal.getHumanBodyParts(obj.Height);

Error in helperBackScatterSignals (line 63)

pedestrian = backscatterPedestrian('InitialPosition',ped_pos,...

Error in test_udoppler (line 4)

[xPedRec,xBicRec,xCarRec,Tsamp] = helperBackScatterSignals(numPed,numBic,numCar);

Answer 1

[Steven Lord]

See Bug Report 2470530. Apply the workaround given in that bug report or fix it by installing release R2021a Update 2 if possible.

[Khue Ha]

Thank you very much, this works perfectly!

Answer 2

[Walter Roberson]

internal is not an attribute . internal is just part of the name. MATLAB uses internal as part of names to indicate that the functions are not intended to be directly called by the user. A lot of the time, items marked internal are either coded as "built in" (that is, implemented in C or C++ or Fortran), or else coded as .p files.

phased.internal.* is part of the implementation files for the Phased Array Toolbox, and the example would probably fail at that point if you do not have that toolbox installed and licensed,

[Khue Ha]

Dear Roberson,

Thank you for valuable information. I checked that Phased Array Toolbox installed and licensed properly, I have run another example ("Introduction to Micro-Doppler Effects") that also uses phased.internal in Phased Array Toolbox and this works well. I realized that there is not getHumanBodyParts.m file in my "R2021a\toolbox\phased\phased\+phased\+internal" folder. I am wondering that there is any alternate version of this function?

[Walter Roberson]

Your error message is about line 287 in backscatterPedestrian where it calls pahsed.internal.getHumanBodyParts . But when I check in R2021a (update 3), I see that line 287 is about releasing an object, and the closest to that call is line 272

            [obj.pBodyPartsJointsInitialPosition,~] = radar.internal.getHumanBodyParts(obj.Height);

Notice the reference to radar not phased

I suspect that somehow you do not have the correct R2021a version of that example or the implementing files.

It might be worth reinstalling Phased Array Toolbox and Radar Toolbox

[Khue Ha]

Dear Roberson,

Thank you for your support, I have solved the problem by remove backscatterPedestrian.m file in the example folder like Steven mentioned above.