Results 2 issues of Mingtau Li

Is there a way to retrieve the arguments from a function? For instance, if I typed in `sin(3+x)+cos(x)` into a guppy field, I'd like to get the `3+x` part back...

I'm trying to insert the contents of one guppy object into another without replacement. I've been successful at this by extracting the doc object `g1.engine.insert_doc(g2.doc());` (Basically, I want to save...