The formula of a real calculus is not allowed to refer to a complex number. Thus if you want to use the modulus of a complex number you have first to create a modulus of complex
You can then refer to this calculus (which is a real calculus) in another real calculus.
Here is an example :
Let's a complex number named z has been created.
You wish to create a point coordinates of which will be the double of z imaginary part.
You must use menu Calculus - New real calculus - Imaginary part of complex.
In the field Name of the calculus, type a.
Press OK.
When you will create a point by it's coordinates you will specify 2*a in the fields x-coordinate and y-coordinate.
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