Use objects of class 'ConstantGammaClutter' only as scalars or use a cell array

I am trying to use the ConstantGammaClutter object example MathWorks has posted and run into the above error. Here is the relevant portion of code (copied from MathWorks):

clutter = phased.ConstantGammaClutter('Sensor',array,...
    'PropagationSpeed',c,'OperatingFrequency',fc,'PRF',prf,...
    'SampleRate',fs,'Gamma',tergamma,'EarthModel','Flat',...
    'TransmitERP',tpower,'PlatformHeight',height,...
    'PlatformSpeed',speed,'PlatformDirection',direction,...
    'BroadsideDepressionAngle',depang,'MaximumRange',Rmax,...
    'AzimuthCoverage',Azcov,'SeedSource','Property',...
    'Seed',40547);

%   Simulate the clutter return for 10 pulses.
Nsamp = fs/prf;
Npulse = 10;
sig = zeros(Nsamp,Nele,Npulse);
for m = 1:Npulse
    sig(:,:,m) = clutter();
end

MATLAB seems to object to my referencing clutter with parentheses, in the loop. I assume this is do to my operating MATLAB 2015b, not the current 2016b. I have virtually no experience with cell arrays so I'm not sure how to alter the above code. Help?

Answer 1

[Honglei Chen]

This is not about the cell array since there is only one clutter object. It is really because you are using R2015b so the new syntax of running System object with the name is not supported. To get around this error, replace the line

sig(:,:,m) = clutter();

with

sig(:,:,m) = step(clutter);

it should just run fine. You can find more information about this alternative syntax in the following reference page (the first row in Common Methods table)

https://www.mathworks.com/help/dsp/gs/system-objects-methods.html

HTH

[Dean Ranmar]

Thank you!