Robert Bradshaw wrote: > On Dec 3, 2008, at 5:55 AM, Stan Schymanski wrote: > >> Dear all, >> >> Could anyone tell me how to controll the order in which arguments are >> evaluated when they are passed to python functions? It seems that the >> functions are evaluated first and then the variables are substituted, >> which leads to failures in the following example: > > To answer the original question, Python doesn't give control over > this. Arguments are always evaluated before passed to the function. > (What one can do, as Jason demonstrated, is pass in a function to be > evaluated later).
So, bringing up an issue that has come up before, there is no way to do the equivalent of the Hold or HoldAll commands in Mma? See http://reference.wolfram.com/mathematica/ref/Hold.html?q=Hold&lang=en for example. It'd still be nice if there were a way to be able to create and deal with unevaluated symbolic expressions (for example, if I want to print an integral sign by doing latex(hold(integrate(...))) ). I guess we could add yet another feature to the preparser if there was enough demand. Another way to do it might be to have classes like Integrate (as opposed to functions), that represent an integral. That still wouldn't prevent something like Integral(2+3,(x,0,3)) being simplified to Integral(5,(x,0,3)), though. Thanks, Jason --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
