I have ran into a caching problem while working on my project for the vector calcculus module. This occurred while I was debugging the express method on vector (this isn't really relevant though).
So, I have a symbol theta and another symbol phi. >>> cs.theta cs.theta >>> cs.phi cs.phi cs is an instance of the CoordSysSph class (again, not really relevant to the problem at hand). The problem: >>> sin(cs.theta) * sin(cs.phi) sin(cs.theta) ** 2 Well, in the definition for the cacheit decorator, the dicitionary func_cache_it_cache exists. Now, when sin(cs.theta) is called, a key, value pair gets added to the dictionary: *((sin, <class 'sympy.core.function.FunctionClass'>), (cs.theta, <class 'sympy.vector.vector.BaseScalar'>)) :* *sin(cs.theta)* * * Now, when SymPy needs to calculate sin(cs.phi), the cacheit decorator is called again. The lookup key for sin(cs.phi) is generated as: *((sin, <class 'sympy.core.function.FunctionClass'>), (cs.phi, <class 'sympy.vecto**r.vector.BaseScalar'>))* At this point, the func_cache_it_cache *does not* have the key correspondind to sin(cs.phi), as it shouldn't. But, here's the catch: running the has_key method on func_cache_it_cache for this second key (for sin(cs.phi)) returns True. That means, the cache returns sin(cs.theta). And that is what is causing the problem. What can I possibly do here? For the time being, I am going to proceed with the debugging. When there is a solution for this problem, we can go ahead and fix this. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
