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vector field specifying location of vectors


Hello. 

I'd like to plot a vector field and specify which vectors to plot (for example, only at points with integer coordinates). 

What I am trying to do is show how a vector field transforms under a planar transformation.  So, if F is the planar transformation, a vector V based at the point (x,y) will become a new vector NV based at F(x,y).

Thanks for any help.


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