Index: /issm/trunk/src/m/classes/public/plot/processdata.m
===================================================================
--- /issm/trunk/src/m/classes/public/plot/processdata.m	(revision 1217)
+++ /issm/trunk/src/m/classes/public/plot/processdata.m	(revision 1218)
@@ -59,5 +59,6 @@
 	%log?
 	if ~isnan(options_structure.log),
-		data=log(data)/log(options_structure.log);
+		pos=find(~isnan(data));
+		data(pos)=log(data(pos))/log(options_structure.log);
 	end
 end