20170912 07:20:23 0500  commented answer  The interval I(u,v) between a pair of vertices u,v in graph seems like just removing the u!=w and v!=w conditions would fix that 
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20150105 18:35:06 0500  answered a question  coupled ode's You can do something like to get a list of values of $A$, evaluated at each of those points. You probably need to do that to each entry in the matrix, since 
20150105 17:08:51 0500  answered a question  Using matrix elements as arguments I guess would also work 
20150105 16:13:45 0500  answered a question  Design of classes for dynamical systems I guess a Bindings is a morphism from SR to itself, that can be coerced more or less trivially to operate on vectors, vector fields, dynamical systems, etc. I don't know whether it would be useful to represent it that way somehow. 
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20150105 14:45:15 0500  asked a question  Design of classes for dynamical systems I have an ongoing project using Sage to process some dynamical systems (ODEs, that is), and along the way I've been developing some classes to generalize the process of storing an ODE system and working with it. I'd be interested in contributing the work to Sage if it's helpful, and in understanding what's a "sagelike" way to do it. So here I'm wondering about what would be worth trying to contribute to Sage, and asking whether people would do the design differently. I have a central class called ODEsystem, which is built around a dictionary encoding the flow function, e.g. if the system is $$dx/dt = axby$$ $$dy/dt = cxdy$$ the flow is a dictionary Another class that may be of use to others is Bindings, which binds variables to specific values in various expressions. For example, if I write I'll get $dx/dt = 12x$. This is a wrapper for Code for those two classes is at https://github.com/wordenlee/SageDyn..., and there's some more stuff in other files there. Example output is at http://lalashan.mcmaster.ca/theobio/w.... Questions:
