[Geotools-devel] [jira] (GEOT-4138) StandardDeviationFunctionTest updated to support GeoTools 2.2 Classifier

[Jody G. (JIRA) <ji...@co...>]

Jody Garnett created GEOT-4138:
----------------------------------

             Summary: StandardDeviationFunctionTest updated to support GeoTools 2.2 Classifier
                 Key: GEOT-4138
                 URL: https://jira.codehaus.org/browse/GEOT-4138
             Project: GeoTools
          Issue Type: Bug
          Components: main
    Affects Versions: 8.0-RC1
            Reporter: Jody Garnett
            Assignee: Jody Garnett
         Attachments: geot-4138-standardDeviation.patch

>From Yang on gt-users:
{panel}
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???
{panel}

Fixes:
- Restored StandardDeviationFunctionTest, it now calculates a classifier, and then ensures that the classifier works. GeoTools 2.1 offered a "single pass" solution based on feature.getParent() method to access the feature collection
- StandardDeviationFunction is now single pass relying on StandardDeviationVisitor to calculate mean value in addition to standard deviation
- RangedClassifier has a few additional null checks, and a generateTitle resulting in the following:

{panel}
Group 0: Below -8.463556903291966
Group 1: -8.463556903291966..19.428814365569345
Group 2: 19.428814365569345..47.321185634430655
Group 3: 47.321185634430655..75.21355690329196
Group 4: Above 75.21355690329196
{panel}

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://jira.codehaus.org/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira