Maurizio wrote: > Hi > > can anyone give an advice on how to adapt Quantities to let it be > compatible with SAGE? I don't know how SAGE modifies the way to > represent numbers, and why it does not comply with Quantities. > > For example, how does SAGE generate an instance of > "sage.rings.integer.Integer"? I hope this can help me. Actually, I > wasn't able to understand how Quantities deals with numbers, because > it basically transform any python int or float multiplied by a > physical unit, into a numpy array (either a single element or a > vector) with unit "dimensionless". I think there would be nothing > wrong with continue using normal sage integers or float as > dimensionless, even though I don't know how could we manage an object > given by the multiplication of an integer and a physical unit: would > this become a "quantity" instance? This would be fast to implement, > because that's the way it is now. Nonetheless, this is not the way I > would like it to do, because it would cause the necessity to add in > quantity the way to deal with all the possible types in SAGE (also > symbolics, in future?).
Not necessarily. As I understand it, quantities are just numpy arrays, basically. Those numpy arrays should be able to contain and deal with any type (sage or python or whatever). I tracked down where the error was in what you posted before. I think if we could get the following two expressions to return the same thing, we may be good to go. Does anyone know what is going on here? sage: import quantities as pq sage: other_sage=numpy.asarray(10).view(pq.Quantity) sage: import numpy sage: numpy.ndarray.__mul__(numpy.array(float(1.0)),other_sage) NotImplemented sage: numpy.ndarray.__mul__(numpy.array(float(1.0)),other_sage.astype(int)) array(10.0)*dimensionless Thanks, Jason --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
