Ineed a little problem here,  it is a really simple code:

I need to do a substraction between CV2 Y value  and CV Y (both are 
XY_KNOBS)value and that result will be the value of another knob. ALso, how can 
I set an expression of XY_KNOBS translation as well, thanks!!! 



import math
def conversion():
#setCamera Parameters
st = nuke.nodes.NoOp(name='LE RULERo')
IS = nuke.Int_Knob( "ctrl","RESULT_PIXEL" )
CV = nuke.XY_Knob( "ctrl2","RIGHTPOS" )
CV2 = nuke.XY_Knob( "ctrl3","LEFTPOS" )
st.addKnob(IS)
st.addKnob(CV)
st.addKnob(CV2)



IS.setValue(RESULT OF SUBSTRACTION OF CV.Y AND CV2.Y)

CV.setValue(1132,0)

CV.setValue(546,1)

CV2.setValue(1356,0)

CV2.setValue(546,1)

I cant make this thing to work, thank ytou
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