Is my feature extraction using glcm is true or false? Please!!!

i am doing plant disease detection and classification. i do the following steps:

1. preprocessing using median filtering
2. image segmentation using color thresholder app in matlab
3. feature extraction using GLCM
4. classification using SVM

In this, i have done step 3 but i'm not certain it is true. So, i want to check up my code in feature extraction don't call function. How can i check up?(Eg. if i get energy=0.5, how to calculate to get 0.5 by handwritten without using mathlab function?)

My code is given in the following:

 % Title : Potato Leaf Disease Detection using SVM

clc
close all 
clear all

[filename, pathname] = uigetfile({'*.*';'*.bmp';'*.jpg';'*.gif'},
                                    'Pick a Leaf Image File');
I = imread([pathname,filename]);
I = imresize(I,[256,256]);
%figure, imshow(I); title('Input Leaf Image');

 %Preprocessing using median filtering

I1 = rgb2gray(I);
I2 = medfilt2(I1,[3 3]);
imshow(I2);title('Filtered Image');

%%Image Segmentation 
%Background Removing using Color Thresholder app

[bw,rgb] = background_removal(I);

%Masking Green_Pixels

mask = (rgb(:,:,2)>rgb(:,:,1))&(rgb(:,:,2)>rgb(:,:,3));
seg_img=bsxfun(@times,rgb,cast(imcomplement(mask),'like',rgb));
imshow(seg_img);

%%Feature Extraction
% Convert to grayscale if image is RGB

   img = rgb2gray(seg_img);

% Create the Gray Level Cooccurance Matrices (GLCMs)

glcms = graycomatrix(img);

%Evaluate 10 features from the disease affected region only
% Derive Statistics from GLCM

   stats = graycoprops(glcms,'Contrast Correlation Energy Homogeneity');
  Contrast = stats.Contrast;
  Correlation = stats.Correlation;
  Energy = stats.Energy;
  Homogeneity = stats.Homogeneity;
  Mean = mean2(seg_img);
  Standard_Deviation = std2(seg_img);
  Entropy = entropy(seg_img);
  RMS = mean2(rms(seg_img));
  %Skewness = skewness(img)
  Kurtosis = kurtosis(double(seg_img(:)));
  Skewness = skewness(double(seg_img(:)));

% Put the 10 features in an array

   feat_disease = [Contrast,Correlation,Energy,Homogeneity, Mean, Standard_Deviation, Entropy, RMS, Kurtosis, Skewness];

Someone can tell me my code is true or false?

[Image Analyst]

Looks like the code is false. At least I can't see anything so it can't possibly do anything.

[Yoon ThiriZaw]

Image analyst, where i false? Can u tell me? If my code is complex, i edited attached file as main1

[Image Analyst]

Well at least the code is there now (unlike before), but you didn't format it properly because you have not read this link yet. Please read it and fix your formatting.

[Yoon ThiriZaw]

Yes, Image Analyst, I have done. where it's false in segmentation or feature extraction? Can you answer me because it is important for me. Please!

[Image Analyst]

That would be easier to do if you had attached/uploaded an image!