SEL = VL_CLICKPOINT(V) let the user vl_click a point in the current figure and returns the index v of the closest point (in Euclidean norm) in the collection V. The 2xK matrix V has a a column for each point.

The user can abort the operation by pressing any key. In this case the function returns the empty matrix.

VL_CLICKPOINT(V,N) selects N points in a row. The user can stop the selection at any time by pressing any key. In this case the partial selection is returned. This can be used in combination with N=inf to get an arbitrary number of points.

VL_CLICKPOINT() accepts the following options:

- PlotMarker [0]
Put a marker as points are selected. The markers are deleted on exiting the function.