A calculus is an object defined through it's name and a formula.
A real calculus can be created through icon.
A complex calculus is created through icon.
A calculus can be modify with icon of the top toolbar.
Name i is not available for a calculus or a function. It is reserved for complex calculus.
Real calculus creation :
A real calculus can use all real values previously defined (including measures) but is not allowed to use any complex calculus or complex function.
In the dialog box opening when creating a real calculus :
Complex calculus creation :
A real calculus can use all real or complex values previously defined (including measures) or any complex function but is not allowed to use owner-defined real functions.
In the dialog box opening when creating a real calculus :