On Feb 29, 2012, at 5:54 PM, Neil Toronto wrote: > On 02/29/2012 05:15 PM, John Clements wrote: >> Plot's new "density" function is awesome. I'd like to add something to it, >> though; independent control of the y axis. >> >> Here's the motivating scenario; I'm looking at server logs, to try to see >> which users are hammering the handin server hardest. Suppose I take a list >> of numbers representing the seconds on which a submission occurred. I can >> plot the density of these using (density …), but what I get is the relative >> density, rather than the absolute density. In this case, I want the y axis >> to have the units "elements per unit time". This is different from an >> application such as the one in the docs where the number of data points is >> irrelevant. >> >> This problem becomes much more acute when I'm trying to compare two >> different sets of server logs; the current behavior essentially normalizes >> w.r.t. the number of points. >> >> The easiest way to fix this is just to allow the user to have independent >> control over the y scaling, so that you can for instance write: >> >> (plot (density all-seconds 0.0625 >> #:y-adjust (/ 1 (length all-seconds))) >> #:width 800) >> >> to get a graph that shows density in hits per second. > > If you're only plotting the density graph, you could currently do this: > > (define scale (/ 1 (length all-seconds))) > (parameterize ([plot-y-ticks (ticks-scale (plot-y-ticks) > (linear-scale scale))]) > (plot (density all-seconds 0.0625))) > > > But you probably don't want to. First, some background.
I knew I'd get a good response if I gave you enough information. Thanks! John
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