embedded matlab function error with MFCC features

hello evry body: i used also embedded matlab function in simulink to extract the Mfcc caracteristics of isolated words, but thay give me somme errors: this is may code: ******************************************************************************************************************

function [ceps] = mfcc6(input)
lowestFrequency = 133.3333;
linearFilters = 13;
linearSpacing = 66.66666666;
logFilters = 27;
logSpacing = 1.0711703;
fftSize = 256;
cepstralCoefficients = 12;
windowSize = 256;       
samplingRate = 8000;
frameRate = 100;
totalFilters = linearFilters + logFilters;  
freqs = lowestFrequency + (0:linearFilters-1)*linearSpacing;
freqs(linearFilters+1:totalFilters+2) =    freqs(linearFilters) * logSpacing.^(1:logFilters+2);
lower = freqs(1:totalFilters);
center = freqs(2:totalFilters+1);
upper = freqs(3:totalFilters+2);
mfccFilterWeights = zeros(totalFilters,fftSize);
triangleHeight = 2./(upper-lower);
fftFreqs = (0:fftSize-1)/fftSize*samplingRate;
for chan=1:totalFilters
    mfccFilterWeights(chan,:) =   (fftFreqs > lower(chan) & fftFreqs <= center(chan)).* triangleHeight(chan).*(fftFreqs-lower(chan))/(center(chan)-lower(chan)) + ...
  (fftFreqs > center(chan) & fftFreqs < upper(chan)).* triangleHeight(chan).*(upper(chan)-fftFreqs)/(upper(chan)-center(chan));
end
hamWindow = 0.54 - 0.46*cos(2*pi*(0:windowSize-1)/windowSize);
mfccDCTMatrix = 1/sqrt(totalFilters/2)*cos((0:(cepstralCoefficients-1))' * (2*(0:(totalFilters-1))+1) * pi/2/totalFilters);
mfccDCTMatrix(1,:) = mfccDCTMatrix(1,:) * sqrt(2)/2;
    preEmphasized = filter([1 -.97], 1, input');
windowStep = samplingRate/frameRate;
cols = fix((length(input')-windowSize)/windowStep);
ceps = zeros(cepstralCoefficients, cols);
for start=0:cols-1
    first = start*windowStep + 1;
    last = first + windowSize-1;
    fftData = zeros(1,fftSize);
    fftData(1:windowSize) = preEmphasized(first:last).* hamWindow;
    fftMag = abs(fft(fftData));
    earMag = log10(mfccFilterWeights * fftMag');
    ceps(:,start+1) = mfccDCTMatrix * earMag;
end
end

********************************************************************************************************************** it give me the fellowing errors: ******************************************************************************************************

    1-  Function output 'y' cannot be of MATLAB type. 

    Function 'Parametrisation MFCC/mfcc6' (#240.0.282), line 1, column 1:

    "function y = paramettre(x)"
    2- Errors occurred during parsing of Embedded MATLAB function 'Parametrisation
    MFCC/mfcc6'(#240) 
    3-Embedded MATLAB Interface Error: Errors occurred during parsing of Embedded MATLAB function 'Parametrisation MFCC/mfcc6'(#240) .
    *******************************************************************
    *best regard*

Answer 1

[Kaustubha Govind]

You need to pre-declare 'y' to the expected output type of your function. See this documentation section for an explanation.

[latsi lab]

in this case y _is the same with _ceps; i pre declare _ceps_by

ceps = zeros(cepstralCoefficients, cols);

but when i run the model it give this error.

Function output 'y' cannot be of MATLAB type.

[Kaustubha Govind]

Could you also pre-declare 'y' in a similar fashion?