I'd like to set up values that display as symbols but evaluate to numbers when called with .n(). I think this is similar to how pi and E are handled. In my case it's constants such as the speed of light, and Boltzmann's constant. When I look at the symbolic representation, I'd like to see these values represented as symbols (c, k_B), but when I evaluate I'd like their true value used without the need for explicit substitution.
Is there an easy way to set up such values? Looking through the source, I found Pi and Exp1 defined in sympy.core.numbers-- and it looks like each is a custom class. Is there a trick to setting up _as_mpf_val and approximation_interval for physical constants such as these? Does _sage_ need to be implemented if I'm not running within Sage? Thanks-- Greg -- 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.
