I would recommend reading the test cases for working examples - from
StandardDeviationFunctionTest:
public void testSetNumberOfClasses() throws Exception{
LOGGER.finer("testSetNumberOfClasses");
Literal classes = ff.literal(3);
PropertyName exp = ff.property("foo");
StandardDeviationFunction func = (StandardDeviationFunction)
ff.function("StandardDeviation", exp, classes);
assertEquals(3, func.getClasses());
classes = ff.literal(12);
func = (StandardDeviationFunction) ff.function("StandardDeviation",
exp, classes);
assertEquals(12, func.getClasses());
}
I also note that some test cases are commented out indicating that they don't
work (perhaps you can provide a code review and patch).
Let me quickly check the docs…
http://docs.geotools.org/latest/userguide/library/main/collection.html#classifier-functions
http://docs.geotools.org/latest/userguide/extension/brewer/classifier.html
That page has examples showing how to both make a Classifier by hand or using
one of the functions, but yeah no example of standard deviation.
--
Jody Garnett
On Friday, 4 May 2012 at 1:54 AM, Y_Wang wrote:
> Dear All,
>
> I had trouble to find out what exactly arguments used for standard deviation
> classification function. Tested it endlessly without luck.
>
> There should be two arguments. Like quantile and others, is it right to pass
> attribute name such as 'population' or 'headcount' for average and how about
> the other? Tested with classification numbers such as 1, 2, 6...no good, the
> function returns error with no content to trace. Strangely, if tested using
> any number less than 1, such as 0.5, 0.25, the function runs with no error
> but the map not shown.
>
> Any help???
>
> Thanks a lot!
>
> Yang
>
> --
> View this message in context:
> http://osgeo-org.1560.n6.nabble.com/StandardDeviation-Classification-Arguments-tp4949728.html
> Sent from the geotools-gt2-users mailing list archive at Nabble.com
> (http://Nabble.com).
>
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