How to change the scale on x,y axes? In thisr picture the scale x is 1, I want to change to 0.5. Can you help me to change it? Thank you.
You probably need the FrameTicks-option, e.g.:
FrameTicks
ContourPlot[<arguments>, FrameTicks -> {Range[0, 10, .5], Range[0, 10, .5]}]