Feature Vector of Matlab's Gabor Built in Function

I was create a Bank of Gabor with gabor function and using it for imgaborfilt function.

These function is Matlab R2015b's built in function.

What i am asking for is, how to get feature vector?

Is the result of imgaborfilt is feature vector?

I think, the result of imgaborfilt is just convolution between image with Gabor's bank.

Is the Gabor feature vector algorithm are smiliar like this?

jumlah_bank = length(gaborArray);
for i = 1:jumlah_bank
    subplot(4,2,i)
    hasil_gabor{i} = gaborMag(:,:,i); % Convolution between image with each bank Gabor
    imshow(gaborMag(:,:,i),[]);
    theta = gaborArray(i).Orientation;
    lambda = gaborArray(i).Wavelength;
    title(sprintf('Orientation=%d, Wavelength=%d',theta,lambda));

      featureVector = [];
      for a = 1:jumlah_bank
              gaborAbs = sum(abs(gaborMag(:,i)), 2); % sum all matrix elements in each rows
              gaborAbs = gaborAbs(:);
              % Normalized to zero mean and unit variance. 
              gaborAbs = ((gaborAbs-mean(gaborAbs))/(4.*std(gaborAbs,1))) + 0.5; % feature vector equation from Moftah Elzobi et al
              featureVector =  [featureVector; gaborAbs];
      end
  end

The feature vector algorithm above is inspired from Moftah Elzobi's et al paper : Gabor Wavelet Recognition Approach for Off-Line Handwritten Arabic Using Explicit Segmentation

Thanks in advance.

Edit #1

From Mr. Walter Roberson's explanation, i would to explain what for is this feature vector. The purpose is for get feature vector of word's handwritting. The handwritten text is very ugly or very hard to read (i.e Doctor's handwritting text). I need a Gabor feature vector algorithm for each Doctor's word segmented handwritting text.

Answer 1

[Walter Roberson]

Every function that calculates an scalar or vector output from an input, is a function that creates a feature vector. The problem is not in creating feature vectors, the problem is in finding useful feature vectors.

[Angga Lisdiyanto]

Thanks, i edited my question on Edit #1.