[QGIS-Developer] Quantile (Equal Count) broken or is data borked?
Richard Duivenvoorde
rdmailings at duif.net
Fri Mar 1 23:41:19 PST 2019
Hi,
I've been asked to see if I can add 'logarithmic' breaks to the
GraduatedSymbolRenderer.
I am right that it is missing, yes?
BUT: looking into current code and testing the available break modes I
happen to look at the Quantile (Equal Count) one with a random dataset I
had around:
https://duif.net/temp/QuantileEqualCount.png
Using more classes makes it even worse:
https://duif.net/temp/QuantileEqualCount2.png
As you see a lot of 'empty' zero classes.
If I google: "The quantile map tries to bin the same count of features
in each of the x classes."
As if the 'breaks'-algorithm cannot handle zero's or floats or negative
values ???
The spread is indeed funny, see:
https://duif.net/temp/EqualInterval.png
What do others think?
Am I misunderstanding things or is my data borked?
Regards,
Richard Duivenvoorde
ps cannot share the data yet... would be cool if there was a processing
algorithm called 'randomize points' or so :-)
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