`quiver`

Plots a 2-D vector field as arrows.

Syntax

quiver(X, Y, U, V)

Draws an arrow at each point (X, Y) with components (U, V).

quiver(U, V)

Places the arrows on an evenly spaced grid.

quiver(___, scale)

Scales the arrow length; 0 turns off the automatic scaling.

quiver(___, LineSpec)

Sets color and style of the arrows.

h = quiver(___)

Also returns the Quiver object.

Description

By default the arrows are scaled so that the longest one does not overlap its neighbors; the lengths therefore show relative magnitudes. Build the grid with meshgrid and compute the components from a formula or from gradient.

Input arguments

X, Y: Arrow base positions.
U, V: Components of the vectors, the same size as X and Y.
scale: Scale factor of the arrow length.

Output arguments

h: Quiver object with UData and VData.

Example

Rotation field

[x, y] = meshgrid(-2:0.5:2);
quiver(x, y, -y, x)
axis equal

In the app, the figure is drawn below the code.

quiver