SPUG: X-Y scatter-plotting with annotated datapoints
kahn at cpan.org
Thu Aug 15 16:43:31 CDT 2002
So I've got this complex data-set representing phonetic symbols and a
couple of pitch and timing values (in milliseconds and Hertz) for each
symbol. (This is data emitted by a text processing engine, coming up with
a plausible prosody for text-to-speech synthesis). Sample (and entirely
bogus) data is at the bottom of this note.
What I'd like to do is an X-Y plot (where time in ms is the X axis, and
Hz is the Y axis, with each "target" representing a point on that plot).
Ideally, the dots should be connected along the timeline (in their X
More important than the connectedness, though, is that the targets be
associated with the phonetic symbols they are subordinate to. These data
are pretty much worthless as a series of points if I can't synchronize
those points to the phonetic symbols. I can think of two nice ways to
demonstrate the synchronization:
* attach the phone symbol to each point
* plot the phone symbols as regions along the X axis
But I've gotten stuck looking for a tool that can build me this graph. I
experimented with Excel's graphing abilities -- no dice, as far as I could
tell, since I could get the X-Y plot, but no way to attach the phone
symbols, or I could get the phone symbols, but then they were
evenly-spaced along the X (time!) axis, despite their widely varying time
I once solved a problem like this using SAS, but I don't have it now and I
don't have the budget.
So, I thought, I'll turn to Perl, since everything is easier in Perl.
(It is, isn't it?) I found Martin Verbruggen's GD::Graph, which is very
spiffy, but doesn't have a way to do this all neatly packaged. Before I
plunge in to write an extension to GD::Graph (or -- please, no -- write it
directly in GD!), does anybody have any ideas or advice? Has anybody
solved a problem like this before using Perl?
Note the format below is not what I'm using; I've got it in XML, so it's
completely parsed. I am *not* interested in help parsing the data, just
giving some sense of the kind of data I have.
Input text: "she had"
ms Hz phonetic-symbol
0 120 S
20 118 (also S)
30 110 i
70 125 (also i)
90 120 h
120 110 (also h)
170 108 A
200 105 (also A)
210 100 d
245 95 (also d)
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