Can someone please explain me the code and how can i give my input in it?

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Nana Fernandes 2017-4-12

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I want a kalman filter with two inputs and one output port; 1st Input is a excel sheet with 16801x28 and 2nd is a sample of which i want to see how close are the values to the original which again is a excel sheet of 6rows and 28 columns. Can someone please explain the code given below and tell me where can i input my two excel sheet inputs Thanks in advance

numSamples = 4000;
R = 0.02;
src = dsp.SignalSource;
src.Signal = [ones(numSamples/4,1);   -3*ones(numSamples/4,1);...
    4*ones(numSamples/4,1); -0.5*ones(numSamples/4,1)];
tScope = dsp.TimeScope('NumInputPorts', 3, 'TimeSpan', numSamples, ...
    'TimeUnits', 'Seconds', 'YLimits',[-5 5], ...
    'ShowLegend', true); % Create the Time Scope
kalman = dsp.KalmanFilter('ProcessNoiseCovariance', 0.0001,...
    'MeasurementNoiseCovariance', R,...
    'InitialStateEstimate', 5,...
    'InitialErrorCovarianceEstimate', 1,...
    'ControlInputPort',false); %Create Kalman filter
while(~isDone(src))
   trueVal = src();
   noisyVal = trueVal + sqrt(R)*randn;
   estVal = kalman(noisyVal);
   tScope(noisyVal,trueVal,estVal);
end