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Plot Field Vectors at Random Positions
Plot a vector field by randomly selected positions.
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VectorPlot[{Cos[x^2 + y], 1 + x - y^2}, {x, -3, 3}, {y, -3, 3}, 

 VectorColorFunction -> "Rainbow", 

 VectorPoints -> RandomReal[{-3, 3}, {300, 2}], 

 VectorScale -> {Small, Automatic, None}]
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