Rectangular-Polar conversions

Two methods allow to tranform Complex Results expressed in real-imaginary format to magnitude-phase format, and reversely:

“set2RI” produces a complex Result in rectangular (real-imaginary) format. The method has 0 or 1 argument. If the method has one argument, the object on which the method is called is set to the rectangular complex values of its argument. Otherwise, the object on which the methods is called is modified.
“set2MP” produces a Complex Result in polar (magnitude-phase) format. The method has the same characteristics as “set2RI”.

For these two methods, no complex conversion is performed if the Result is already in the requested format.