# Documentation of m_quiver

Global Index (all files) (short | long) | Local Index (files in subdir) (short | long)

## Function Synopsis

    h=m_quiver(long,lat,u,v,varargin);

## Help text

     M_QUIVER Makes a quiverplot on a map (QUIVER-style)
        M_QUIVER(LONG,LAT,U,V) plots velocity vectors as arrows with components
        (U,V) at the points (LONG,LAT) on the currently defined map.  The
        matrices LONG,LAT,U,V must all be the same size. U and V contain the
        eastward and northward components of velocity. Arrow scaling is automatic.

        M_QUIVER(X,Y,U,V,S) automatically scales the arrows to fit within the
        grid and then stretches them by S.  Use S=0 to plot the arrows without
        the automatic scaling; In this case the scaling is 1 unit/degree
        latitude. Note that we do not scale arrows with respect to map
        coordinates! Instead, the arrows will correspond better to actual motions
        over some time step. The tradeoff is that a single scale arrow cannot
        be accurate for the entire map (M_VEC scales arrows according to
        map coordinates).

        M_QUIVER(...,LINESPEC) uses the plot linestyle specified for
        the velocity vectors.  Any marker in LINESPEC is drawn at the base
        instead of an arrow on the tip.  Use a marker of '.' to specify
        no marker at all.  See PLOT for other possibilities. M_QUIVER is a wrapper
        for QUIVER - for fancier arrows it is possible to replace the call to
        QUIVER with one to another routine that draws fancy arrows, e.g.
        ARROW (from TMW user-contrib software archive), or to use M_VEC.

        M_QUIVER(...,'filled') fills any markers specified.

        H = M_QUIVER(...) returns a vector of line handles.

        See also QUIVER, M_VEC

## Cross-Reference Information

This function calls | This function is called by
--- | ---
m_ll2xy m_proj | m_demo

Pierre-Michel THEVENY <theveny@dt.insu.cnrs.fr>