Can someone pls help me with this code. (mfcc)

whenever I am trying to run the code it is throwing an error i.e. =>

"Undefined function or variable 'melfilter'.

Error in mfcc (line 29)
filterBankMat = melfilter(N, Fs,@hamming);                % matrix for a mel-spaced filterbank

Error in phase1 (line 17)
 M = mfcc(y, Fs);"
% ============================================================
CODE: 

function c = mfcc(y, Fs)
% MFCC Calculate the mel frequencey cepstrum coefficients (MFCC) of a signal
%
% Inputs: 
%       y       : speech signal data
%       Fs      : sample rate in Hz of the speech signal data y
%
% Outputs:
%       c       : MFCC output, each column contains the MFCC's for one speech frame

N = 256;                        % frame size
M = 100;                        % inter frame distance
len = length(y);
numberOfFrames = 1 + floor((len - N)/double(M));
mat = zeros(N, numberOfFrames); % vector of frame vectors

for i=1:numberOfFrames
    index = 100*(i-1) + 1;
    for j=1:N
        mat(j,i) = y(index);
        index = index + 1;
    end
end

hamW = hamming(N);              % hamming window
afterWinMat = diag(hamW)*mat;   % square diagonal matrix
freqDomMat = fft(afterWinMat);  % FFT into freq domain

filterBankMat = melfilter(20,N, Fs);                % matrix for a mel-spaced filterbank      [HERE IT IS THROWING ERROR].
nby2 = 1 + floor(N/2);
ms = filterBankMat*abs(freqDomMat(1:nby2,:)).^2; % mel spectrum
c = dct(log(ms));                                % mel-frequency cepstrum coefficients
c(1,:) = [];                                     % exclude 0'th order cepstral coefficient
end

[madhan ravi]

download FEX

Answer 1

[Gaurav Sharma]

on the mathwork website, melfilter is gievn as predefined funcion which can be directly used. That's why I am a bit confused. And if am trying to put melfiter as an input in the argument of the function mfcc, it throws an error of not enough input defined.

what should I do now?? I want to run this code since it is my project. Pls help me !!!

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/23179-melfilter

[Gaurav Sharma]

am actually following this code sir, but my code still throws the same error, "not enough input arguments".

[Walter Roberson]

when you call mfcc pass in @melfilter as the appropriate parameter

[Gaurav Sharma]

Dear Sir, I appologise for asking this again but I didnt get what you want to say. May I request you to explain me a bit more. Matlab is new for me.

Thank You.

[Gaurav Sharma]

Thank You sir, It worked.

[hanif omar]

Dear @Gaurav Sharma , is this mfcc code start from pre emphasis ?

Answer 2

[Jacob Shulman]

if melfilter is a matrix you want to use then it must be an input to the function or be created and defined wihtin the function. functions create different new workspaces with new variables.