A call to dat2tp with second parameter h>0 does not work unless the mexfile findrfc.c is compiled. Rainflow filtering should be done by the routine dat2dtp which does not require the mex-file, but only the special filtering routine rfcfilter.m. Alternatively, rfcfilter.m may be used. Any call to findrfc will result in an empty matrix and a warning. July 12, 2000 Georg Lindgren georg@maths.lth.se