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fix basic statistics calculation ( mean no longer always 0.00! )

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git-svn-id: http://svn.osgeo.org/qgis/trunk@10848 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
cfarmer 2009-05-25 21:05:34 +00:00
parent cfd97adee1
commit d37aae28a6
1 changed files with 10 additions and 13 deletions
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23
python/plugins/fTools/tools/doVisual.py
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@ -174,11 +174,11 @@ class visualThread( QThread ):
fields = vprovider.fields()
index = vprovider.fieldNameIndex( myField )
feat = QgsFeature()
sumVal = 0
meanVal = 0
stdVal = 0
cvVal = 0
nVal = 0
sumVal = 0.0
meanVal = 0.0
stdVal = 0.0
cvVal = 0.0
nVal = 0.0
values = []
first = True
nFeat = vprovider.featureCount()
@ -196,20 +196,17 @@ class visualThread( QThread ):
if value < minVal: minVal = value
if value > maxVal: maxVal = value
values.append( value )
sumVal = sumVal + value
sumVal = float( sumVal + value )
nElement += 1
self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), nElement )
nVal= float( len( values ) )
print "to here"
if not nVal > 0.00:
print "then here"
if nVal > 0.00:
meanVal = float( sumVal ) / nVal
if not meanVal == 0.00:
for val in values:
stdVal += ( ( val - meanVal ) * ( val - meanVal ) )
print "finally here"
stdVal = math.sqrt( stdVal / nVal )
cvVal = stdVal / meanVal
stdVal += float( ( val - meanVal ) * ( val - meanVal ) )
stdVal = float( math.sqrt( stdVal / nVal ) )
cvVal = float( stdVal / meanVal )
lstStats = []
lstStats.append( "Mean : " + unicode( meanVal ) )
lstStats.append( "StdDev : " + unicode( stdVal ) )