Index: /issm/trunk-jpl/src/m/plot/plot_gridded.m
===================================================================
--- /issm/trunk-jpl/src/m/plot/plot_gridded.m	(revision 21239)
+++ /issm/trunk-jpl/src/m/plot/plot_gridded.m	(revision 21240)
@@ -92,2 +92,16 @@
 options=addfielddefault(options,'axis','xy equal'); % default axis
 applyoptions(md,data,options);
+
+function y = nmedian(x,n)
+%NMEDIAN Generalized median filter
+%  NMEDIAN(X,N) sorts elemets of X and returns N-th value (N normalized).
+%  So:
+%     N = 0 is minimum value
+%     N = 0.5 is median value
+%     N = 1 is maximum value
+
+if nargin < 2
+	n = 0.5;
+end
+y = sort(x(:));
+y = interp1(sort(y),n*(length(y)-1) + 1);