  1.  NAME

  contoxyz - Reorder and regrid contour data

  2.  SYNOPSIS

  [x,y,z] = contoxyz(data, iz, yi )

  3.  DESCRIPTION

  This Matlab function selects specified z variables from an input
  contour file. It also reorder the columns to have x and y the least
  and next varying values. Data are also regridded on a specified grid
  along y values.

  4.  PARAMETERS

     data
        Array containing contour data. The x and y must be located in
        the frist two columns,respectively.

     iz Column number of the z variable to retrieve from the data
        matrix.

     yi A vector on which contour data should be interpolated. This is
        necessary because some contour data do not have values at
        identical y in different profiles.

  5.  RETURNS

     x  A vector containing x values.

     y  A vector containing y values (same as yi).

     z  An array containing the desired z values,interpolated on grid
        defined by x and yi values.

  6.  AUTHORS

  Pierre Jaccard, Geophysical Institute, University of Bergen, 1999

