When the quantity that depends on x and y has both magnitude and a direction it can be represented by an arrow whose length is proportional to the magnitude. The* x-y* plane can be broken into a regular grid and an arrow drawn in the plane, representing the direction and magnitude associated with each point on the grid—a** vector plot**. As we are associating two quantities, the magnitude and direction, or, equivalently, Δx and Δy, for each* x-y* pair, we can think of this type of plot as a 4D plot.

The previous figure is a vector field of a rotating flow. The exact appearance of the arrows will vary with the output terminal.

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