Interactive Plotting

The ginput function enables you to use the mouse or the arrow keys to select points to plot. ginput returns the coordinates of the pointer's position; either the current position or the position when a mouse button or key is pressed. See the ginput function for more information.

Example - Selecting Plotting Points from the Screen

This example illustrates the use of ginput with the spline function to create a curve by interpolating in two dimensions.

First, select a sequence of points, [x,y], in the plane with ginput. Then pass two, one-dimensional splines through the points, evaluating them with a spacing 1/10 of the original spacing.

This plot shows some typical output.

  Displaying Contours in Polar Coordinates Animation