using matplotlib to plot running totals

Hello, I have a table that contains a series of values for

    > each day I would like to use matplotlib to plot the running
    > total of those values over time right now, I am computing
    > an intermediary "running total table" myself and then plot
    > that. I just wonder whether matplotlib can be instructed
    > to plot running totals so I can skip that intermediary step
    > thanks for any insight you might have -frank

If you posted an example we might be able to advise on a better
approach. See also the numerix cumsum function...