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93 lines
4.1 KiB
Python
93 lines
4.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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StatisticsByCategories.py
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---------------------
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Date : September 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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from builtins import str
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__author__ = 'Victor Olaya'
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__date__ = 'September 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from qgis.core import QgsStatisticalSummary
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from processing.core.outputs import OutputTable
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.tools import dataobjects, vector
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterTableField
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class StatisticsByCategories(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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VALUES_FIELD_NAME = 'VALUES_FIELD_NAME'
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CATEGORIES_FIELD_NAME = 'CATEGORIES_FIELD_NAME'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Statistics by categories')
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self.group, self.i18n_group = self.trAlgorithm('Vector table tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input vector layer')))
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self.addParameter(ParameterTableField(self.VALUES_FIELD_NAME,
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self.tr('Field to calculate statistics on'),
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self.INPUT_LAYER, ParameterTableField.DATA_TYPE_NUMBER))
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self.addParameter(ParameterTableField(self.CATEGORIES_FIELD_NAME,
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self.tr('Field with categories'),
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self.INPUT_LAYER, ParameterTableField.DATA_TYPE_ANY))
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self.addOutput(OutputTable(self.OUTPUT, self.tr('Statistics by category')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
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valuesFieldName = self.getParameterValue(self.VALUES_FIELD_NAME)
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categoriesFieldName = self.getParameterValue(self.CATEGORIES_FIELD_NAME)
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output = self.getOutputFromName(self.OUTPUT)
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valuesField = layer.fields().lookupField(valuesFieldName)
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categoriesField = layer.fields().lookupField(categoriesFieldName)
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features = vector.features(layer)
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total = 100.0 / len(features)
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values = {}
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for current, feat in enumerate(features):
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progress.setPercentage(int(current * total))
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attrs = feat.attributes()
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try:
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value = float(attrs[valuesField])
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cat = str(attrs[categoriesField])
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if cat not in values:
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values[cat] = []
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values[cat].append(value)
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except:
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pass
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fields = ['category', 'min', 'max', 'mean', 'stddev', 'sum', 'count']
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writer = output.getTableWriter(fields)
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stat = QgsStatisticalSummary(QgsStatisticalSummary.Min | QgsStatisticalSummary.Max |
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QgsStatisticalSummary.Mean | QgsStatisticalSummary.StDevSample |
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QgsStatisticalSummary.Sum | QgsStatisticalSummary.Count)
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for (cat, v) in list(values.items()):
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stat.calculate(v)
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record = [cat, stat.min(), stat.max(), stat.mean(), stat.sampleStDev(), stat.sum(), stat.count()]
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writer.addRecord(record)
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