If I have a vector layer in QGIS, how do I use Python to find the maximum value which a given field has? I need to convert the values in one field into values between 0 and 1. I guess I therefore need to set it to val/maxVal. That's why I need to find the maximum value.
Answer
This does not work in qgis3. See below for updated answer
It is not necessary to get a complete list of field values. In QgsVectorLayer exists 'maximumValue' method. So, this works well and it's shorter:
layer = iface.activeLayer()
idx = layer.fieldNameIndex('fieldName')
print layer.maximumValue(idx)
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