First Order Texture Features

I found this code that calculates some of the first order feautures. But it calculates in different ways the features and I get different values..Does anyone knows what is the correct way? http://www.mathworks.com/matlabcentral/answers/129096-calculating-first-order-histogram-based-features

[Walter Roberson]

You will need to show us your code as well.

[Ann G]

There is no code yet...I need to extract the first order features from an image, lets say image1...

[Walter Roberson]

If you do not have any code, then how do you know that you get different values?

[Ann G]

I use the code above, by reading a specific image, and I get the results of the code above..But it has 2 or 3 different ways to calculate each feature..My question is, which of these ways is the right one?