I guess your data are treated as text in stead of numbers. You can check
this on the Fields tab of the Layer Properties dialogue.
Sake
Op 31-8-2012 23:19, Roy Marsh schreef:
IN QGIS 1.8 I want to create a simple choropleth to show 5 bands for a
range of numeric values
I open Properties /Style for the vector layer and choose Legend Type
'Continuous Colour'
This should allow me to group values in a specified field into
meaningful bands
Unfortunately, the 'classification field' box is greyed out in the
dialogue box, so no existing fields are selectable
Strangely, if a new field is created, this becomes one of the
selectable fields in the 'Classification field' box
Surely the system should not behave like this?
Roy
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