| Re: Frustrated by 2 Data Plotting problems [message #76276 is a reply to message #76275] |
Fri, 27 May 2011 11:14   |
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Paul Van Delst[1]
Messages: 1157
Registered: April 2002
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Senior Member |
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David Fanning wrote:
> almost_like_a_metaphor writes:
>
>> THe CGplot solutoion also works quite well, but slow. I currently have
>> ~400,000 points to plot, and will end up with probably an order of
>> magnitude more before this is done with.
>
> I hate to be a spoil sport, but what is the point
> of putting 4 million points on a plot!? Don't some
> of them, uh, overlap? Think "visualization" rather
> than "By God I have the data and I'm gonna plot it!".
Dunno about the OP, but plotting lots and lots of points (i.e. scatter plot) can tell you a lot about the relationships
in, and between, datasets. Especially if datasets derived using different algorithms/input-data/whatever are
scatter-plotted with different colours. (a meaningless scatterplot scenario: red points show a linear dependency with a
negative bias, the blue quadratic with a positive bias, and the green linear/+ve bias for low wind speeds, but inverted
quadratic for higher windspeeds)
I could also see plotting individual points using a color gradient to include, say, time information in said
scatter-y-type plot.
It wouldn't be the only way I would look at a dataset, but it is still a useful visualisation of the data.
cheers,
paulv
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