"erikcw" wrote: > I have a collection of ordered numerical data in a list. The numbers > when plotted on a line chart make a low-high-low-high-high-low (random) > pattern. I need an algorithm to extract the "significant" high and low > points from this data. > > Here is some sample data: > data = [0.10, 0.50, 0.60, 0.40, 0.39, 0.50, 1.00, 0.80, 0.60, 1.20, > 1.10, 1.30, 1.40, 1.50, 1.05, 1.20, 0.90, 0.70, 0.80, 0.40, 0.45, 0.35, > 0.10]
silly solution: for i in range(1, len(data)-1): if data[i-1] < data[i] > data[i+1] or data[i-1] > data[i] < data[i+1]: print i (the above doesn't handle the "edges", but that's easy to fix) </F> -- http://mail.python.org/mailman/listinfo/python-list