Question about CAS and Graphing

[jte]

(11-23-2014 08:42 PM)Han Wrote:  

(11-23-2014 06:31 PM)jte Wrote:  After trying a handful of examples I've also experienced some crashes when going to a Function plot view (crashes that didn't occur with F1 defined as f(X) in the Function Symbolic view — but only when f contained CAS operations).

Could you provide some examples?

IIRC, the examples I tried that crashed when going to a Plot view all showed "Error: Syntax Error" as the F1 definition in the Function Symbolic View. When that occurs, it may be apropos to treat that as a warning and save your work / not enter a Plot view (or, at least, uncheck the function(s) whose definitions come up as syntax errors — even though I wouldn't describe a crash in this situation as being expected).

When I try the following in the CAS screen of a virtual calculator (just after resetting it) I get a window reporting that "the application has crashed and will be restarted":
  f(z):=proot([1,z])
  f(3)
  g(z):=f(z)(1)
  g(3)
  F1:=g
  F1:=g('X')

I included the penultimate step as it demonstrates "Error: Syntax Error" showing up as a definition in the Function Symbolic View. (I didn't observe a crash when I tried going to a Function plot view.)

I do get the plot I expect if I define F1 as g(X) in the Function Symbolic View.

I rarely use the CAS, so there likely are better ways to use it than those that I know of.

PS: I just tried the above example again after setting "Simplify:" to None in the CAS Settings screen. After this change in settings I didn't observe a crash with this example.