# Understand the ShearingMatrix

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 Below is the official document of ShearingMatrix: ShearingMatrix[[Theta],v,n] gives the matrix corresponding to shearing by [Theta] radians along the direction of the vector v, and normal to the vector n. But in the following examples, I'm still confused about understanding this command: In[47]:= ShearingMatrix[-Pi/4,{1,0},{0,1}] ShearingMatrix[-Pi/4,{1,0},{1,1}] Out[47]= {{1, -1}, {0, 1}} Out[48]= {{1/2, -(1/2)}, {1/2, 3/2}} Any comments/explanations will be appreciated.Regards,Zhao