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Fix crash when calculating basic stats on a column of zeros

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git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@10409 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
cfarmer 2009-03-23 15:12:55 +00:00
parent a49e520583
commit 71b85ce793
1 changed files with 10 additions and 5 deletions
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15
python/plugins/fTools/tools/doVisual.py
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@ -185,11 +185,16 @@ class visualThread( QThread ):
nElement += 1
self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), nElement )
nVal= float( len( values ) )
meanVal = float( sumVal ) / nVal
for val in values:
stdVal += ( ( val - meanVal ) * ( val - meanVal ) )
stdVal = math.sqrt( stdVal / nVal )
cvVal = stdVal / meanVal
print "to here"
if not nVal > 0.00:
print "then here"
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
lstStats = []
lstStats.append( "Mean : " + unicode( meanVal ) )
lstStats.append( "StdDev : " + unicode( stdVal ) )