MATLAB function

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1. To calculate combination,
   nchoosek(x, y); % This function means "xCy".
   
2. vector inner product
   dot(A,B) or sum(A.*b)
   
3. vector outer product
   cross(A,B)
   
4. To drawing graph,
   axis([ x-axis_start x-axis_end y-axis_start y-axis_end])
   ( e.g. axis([1 10 1 100]) )
   
   title('title') %To write figure's title