log Y axis?

On Wed, Nov 3, 2010 at 6:18 AM, David Frey <dpf...@shaw.ca> wrote:
> I am trying to use matplotlib (for the first time) to graph the address space
> usage of an application against time.  The data is written to a log file by
> trace statements throughout the source code of the application.  The trace
> statements contain the current address space usage as well as a timer value
> with millisecond granularity.
>
> My data in the y-axis (address space usage) is fairly uniform (0-2000 MB
> values), but my data in the x-axis (the time at which the the trace statements
> were executed) is highly clustered.  For example, I have approximately 150
> data points over a 5 minute run, but some of the data points are only 10ms
> apart.
>
> I would like to annotate each point on the graph with the line number in the
> log file so that the user can look up what was happening at that point.  I 
> have
> succeeded, but the graph isn't readable because there is so much overlap in
> the points.
>
> Is there a standard way that people display data like this?  I don't really
> like the idea of equally spacing all of the points along the x-axis because
> you lose the understanding of the timing.  One idea I had was to have some
> sort of vertical break in the graph at areas where there was a long gap
> without a data point, but I have no idea whether it's possible to implement
> something like that in matplotlib.
>
> The output format hasn't been strictly specified, so if you have any ideas of
> how I can produce a useful graph, I would be happy to hear them.
>
> Thanks,
> Dave
>
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