Not enough input arguments - Function

This is probably easy to spot and solve but I'm new to MATLAB so am having trouble with this.

I would greatly appreciate anybody proposing a solution to the function I have below. The error message is at the bottom and states that there are not enough input arguments. The variable 'data' is a single matrix with dimensions 9x52x2.

function X = CreateFeatures(data,fs,numCh);

% ==================================================================
% ============ Preallocations and definitions ======================
% ==================================================================

numF = 18; % Number of features

fs = 256;

numCh = 8;

X = zeros(1, numF*numCh); % Preallocate

% ==================================================================
% =================== Sub-functions ================================
% ==================================================================

function count = zerox(data) % sub-function: Zero-Crossings

      t       = 1:length(data)-1;

      count   = 0; 

      for i = 1:length(t)

           if sign(data(i)) ~= sign(data(i+1))

              count = count + 1;

           end

      end

end 

function Ent = SpecEnt(data) % sub-function: Spectral Entropy

      x = fftshift(fft(data));

      PSD = abs(x).^2;

      sum = 0;

      for i = 1:length(data)

          sum = sum + PSD(i);
      end

      PSDn = PSD/sum;

      Ent = 0.0;

      for i = 1:length(data)

          Ent = Ent-PSDn(i)*log2(PSDn(i)+eps); % eps is the floating-point 
                                               % relative accuracy

      end

end    

function mob = Hjorth_mob(data) % sub-function: Mobility

      h = 1; %step size for approximated derrivative

      sd = var(data);

      sdx = var(diff(data)/h); %sd of the first derivative of the signal

      mob = sqrt(sdx/sd);

end

function com = Hjorth_com(data) % sub-function: Complexity

      h = 1; %step size for approximated derrivative

      sd = var(data);

      xx = diff(data)/h;

      sdx = var(xx); %sd of the first derivative of the signal

      sdxx = var(diff(xx)/h);

      com = sqrt((sdxx/sdx)/(sdx/sd));

end

% defining constants for input to the aar function below

Mode = [1,2]; % Mode = [aMode vMode]

MOP = [5,0]; % model order (number of parameters = 5)

% ===================================================================
% =============== Creating the feature vector =======================
% ===================================================================

for j = 0:numCh-1 % Loop over channels

      X(numF*j+1) = log10(var(data(j+1,:))); % Hjorth: activity (variance)

      X(numF*j+2) = zerox(data(j+1,:));  % Zero-crossings

      X(numF*j+3) = SpecEnt(data(j+1,:));  % Spectral entropy

      X(numF*j+4) = log10(abs(wentropy(data(j+1,:),'shannon'))); % Shannon entropy

      X(numF*j+5) = log10(Hjorth_mob(data(j+1,:))); % Hjort: mobility

      X(numF*j+6) = log10(Hjorth_com(data(j+1,:)));  % Hjort: complexity

      AllParam = aar(data(j+1,:)', Mode, MOP)' ; % finding all AAR

                                     % parameters using function from Biosig

      X(numF*j+(7:11)) = mean(AllParam(:,6:end),2); % mean over each row 
                                                    % (5 AAR param/channel)

      X(numF*j+12) = log10(bandpower(data(j+1,:),fs,[0.5 4])); % BP delta

      X(numF*j+13) = log10(bandpower(data(j+1,:),fs,[4 8]));  % BP theta

      X(numF*j+14) = log10(bandpower(data(j+1,:),fs,[8 13])); % BP alpha

      X(numF*j+15) = log10(bandpower(data(j+1,:),fs,[14 30])); % BP beta

      X(numF*j+16) = log10(bandpower(data(j+1,:),fs,[31 70])); % BP gamma

      X(numF*j+17) = log10(bandpower(data(j+1,:),fs,[71 100])); % BP high gamma 

      X(numF*j+18) = log10(bandpower(data(j+1,:),fs,[0.5 100])+eps); % BP total

end
end

The error message reads:

>> CreateFeatures
Not enough input arguments.

Error in CreateFeatures (line 88)
    X(j) = log10(var(data(j+1,:))); % Hjorth: activity (variance)

Answer 1

[Walter Roberson]

You define

function X = CreateFeatures(data,fs,numCh);

so CreateFeatures is a function with up to 3 inputs. But you invoke

>> CreateFeatures

which passes no inputs. The code fails at the first place that it refers to one of the three input parameters and discovers that you did not pass in that argument.

[Stephan Raczak]

Thank you for your answer!

Even after passing through the argumnents (data, fs, numCh) I keep receiving the same error message.

Do you happen to have suggestion that may solve this?

Thanks!

[Walter Roberson]

I copied your code in to my system and invoked

CreateFeatures(1:50)

Only 1 argument is needed here because you overwrite the contents of the other two arguments at the very beginning of your code.

The code did not fail with "not enough input arguments". Instead it failed with

Undefined function or variable 'aar'.
Error in CreateFeatures (line 115)
      AllParam = aar(data(j+1,:)', Mode, MOP)' ; % finding all AAR

aar() is not part of MATLAB and does not appear to be part of the File Exchange either.

Possibly it is part of AAR plugin for EEGLAB