PROVEC is the jGraph module of jLab.

 PROVEC  Generate progressive vector diagrams (simple and fancy).
    Simple provecs:
      PROVEC(DT,U,V) generates a simple progressive vector diagram plotting
      CUMSUM(U*DT) vs CUMSUM(V*DT).  U and V are column vectors, or 
      matrices with time oriented in columns. DT is a scalar with units of 
      of hours, while U and V must have units of cm/s.
      PROVEC(DT,CV), where CV=U+iV, also works.
      INT=PROVEC(...) outputs the integrated dispacement INT in km.
    Fancy provecs:
      A fancy provec use SCATTER to plot the color and/or sizes of the 
      points according to another parameter, say density or temperature. 
      A colorbar is also plotted.
      PROVEC(DT,U,V,C) uses C, of size SIZE(U), as the symbol color.
      PROVEC(DT,U,V,C,S) also uses S, of size SIZE(U), as the symbol size. 
      PROVEC(DT,CV,C) and PROVEC(DT,CV,C,S) also work.
      Note that since SCATTER is slow for large datasets, it is useful to
      decimate the data after CUMSUMing but before plotting.  This is 
      accomplished using PROVEC(...,INDEX).  Then only the points 
      INT(INDEX,:) of the integrated trajectory are plotted.
      [INT,H,HC]=PROVEC returns the intergrated displacement INT, the
      handle H to the data, and the handle HC to the colorbar axis.
    As an example,
           load bravo94
           caxis([-8 8])
    makes part of Figure 6b of Lilly and Rhines (2002) JPO.
    Usage: int=provec(dt,cv);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 1999--2017 J.M. Lilly --- type 'help jlab_license' for details

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