[R] 3D pie
Peter Ehlers
ehlers at math.ucalgary.ca
Thu Apr 20 00:41:40 CEST 2006
This discussion of 3-d pie charts comes at an opportune time. I have
just formulated a new theory of graphical information transfer which
is particularly simple in the case of 3-d pie charts.
Let theta denote the angle between the normal to the pie cylinder and
the pie-eyed line (connecting eye and centre of pie). Then the
information transmitted from pie to viewer is
K * (pi/2 - theta)^3
for theta in [0, pi/2]. The normalizing constant may be written in
the obvious manner as
K = 8 * I_0 / pi^3.
I conjecture that I_0 is not large, but I'm still waiting to hear
from Microsoft regarding my application for funding to allow me to
conduct extensive testing.
I'm also working on higher-dimensional generalizations, but even
the 4-d case does not seem to be simple.
Peter Ehlers
Frank E Harrell Jr wrote:
> Rolf Turner wrote:
>
>>Gabor Grothendieck wrote:
>>
>>
>>
>>>Since everyone else wimped out with a tedious you-do-not-want-to-do-that,
>>>here is a solution that uses R to control Excel and create a 3d chart.
>>
>> .
>> .
>> .
>>
>>People really ***should not*** be encouraged or abetted in
>>wrong-headedness. Excel is terrible. Pie charts are terrible.
>>Don't mess with them. Period.
>>
>>
>> cheers,
>>
>> Rolf Turner
>> rolf at math.unb.ca
>
>
> I second that. Helping people do things known to have major problems
> with the approaches can actually hurt others in the long run. 2-D pie
> charts are terrible. That makes 3-D pie charts terrible to the 3/2
> power. Excel has serious errors and is not a good model for
> reproducible research.
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