Re: [matplotlib-devel] New plot type idea -- EventRaster

[Todd]

On Mon, Sep 24, 2012 at 3:33 PM, Todd  wrote:

> I would like to add a new plot type to matplotlib.  Of course I am willing
> to implement it myself, but I want to confirm that it is acceptable and
> iron out the implementation details and API first so there are no major
> surprises when I submit it.
>
> I tentatively am calling the plot type an "EventRaster" plot (name
> suggestions, along with any other suggestions, are welcome).  The plot is
> made up if horizontal rows of identical vertical lines and/or markers.
> Each line or marker represents a discrete event, and each row represents a
> single sequence of events (such as a trial).  The x-axis position of the
> line or marker identifies the location of the event by some measure.  An
> example of what such a plot often looks like is below.
>
> http://hebb.mit.edu/courses/9.29/2003/athena/dylanh/quad-rast.gif
>
> This sort of plot is used ubiquitously in neuroscience.  It is used to
> show the time of discrete neural (brain cell) events (called "spikes") over
> time in repeated trials, and is generally called a spike raster, raster
> plot, or raster graph.  However, it can be used in any situation where you
> are only concerned with the position of events but not their amplitude,
> especially if you want to look for patterns in those events or look for
> differences between multiple sequences of events.
>
> Plotting the timing of events is an obvious use case, such as photons
> hitting photodetectors, radioactive decay events, arrival of patients to
> hospitals, calls to hotlines, or car accidents in cities.  However, the
> events do not have to be relative to time.  It could be position, for
> example, such as tree rings along bore holes, road crossings along railroad
> tracks, layers in sediment cores, or particular sequences along a DNA
> strands.
>
> I'll cover possible implementation details in the next email if everyone
> thinks this is a good idea.
>

So does anyone think this would be a useful plot type?  If so I can explain
how I plan to implement it and we can discuss changes or improvements to
that.
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Re: [matplotlib-devel] New plot type idea -- EventRaster

[Michael Droettboom]

On 09/26/2012 04:35 AM, Todd wrote:
On Mon, Sep 24, 2012 at 3:33 PM, Todd > wrote:


I would like to add a new plot type to matplotlib.  Of course I am
willing to implement it myself, but I want to confirm that it is
acceptable and iron out the implementation details and API first
so there are no major surprises when I submit it.

I tentatively am calling the plot type an "EventRaster" plot (name
suggestions, along with any other suggestions, are welcome).  The
plot is made up if horizontal rows of identical vertical lines
and/or markers.  Each line or marker represents a discrete event,
and each row represents a single sequence of events (such as a
trial).  The x-axis position of the line or marker identifies the
location of the event by some measure. An example of what such a
plot often looks like is below.

http://hebb.mit.edu/courses/9.29/2003/athena/dylanh/quad-rast.gif

This sort of plot is used ubiquitously in neuroscience.  It is
used to show the time of discrete neural (brain cell) events
(called "spikes") over time in repeated trials, and is generally
called a spike raster, raster plot, or raster graph.  However, it
can be used in any situation where you are only concerned with the
position of events but not their amplitude, especially if you want
to look for patterns in those events or look for differences
between multiple sequences of events.

Plotting the timing of events is an obvious use case, such as
photons hitting photodetectors, radioactive decay events, arrival
of patients to hospitals, calls to hotlines, or car accidents in
cities.  However, the events do not have to be relative to time. 
It could be position, for example, such as tree rings along bore

holes, road crossings along railroad tracks, layers in sediment
cores, or particular sequences along a DNA strands.

I'll cover possible implementation details in the next email if
everyone thinks this is a good idea.


So does anyone think this would be a useful plot type?  If so I can 
explain how I plan to implement it and we can discuss changes or 
improvements to that.


Sorry to not get back to you sooner -- a number of us are busy here 
getting the 1.2.0 release ready at the moment.  I think this is 
definitely a worthwhile plot type to add.  Similar plots are used in 
Computer Science, for example, to visualize the execution of 
multi-threaded applications, or other scheduling problems.  I'd 
personally use it for that.


So, yes, let's start talking implementation.  Or, if easier, you could 
just submit a pull request and we can go from there.  Whatever method 
seems most appropriate to you.


Cheers,
Mike
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[matplotlib-devel] print_png bug

[Oleg Volkov]

There is an annoying bug in print_png (a'm using 1.1.0).
After saving figure it just stops redrawing on screen (gdk). It happens
because the print_png calls the set_pixmap method of the canvas renderer
which change the associated drawable forever. I'm using workaround saving
canvas._renderer.gdkDrawable and restoring it after print_png call. Woud be
nice to fix it in the upcoming release if possible.

Regards,
  Oleg Volkov
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