Error: No callback given (argument #0)

[Josh Gates]

I'm trying to run a calculation and graph the results, with a slider to select the size of a parameter and a button to re-run it. The basic loop that does the calculation and graphing runs fine. When I put that into a function and attach it to a button, though, it doesn't run and I get the error above. This is in Trinket: https://trinket.io/glowscript/e99c51c5c3

After this works, I'm not sure exactly what I'll do to clear the previous graphs for the next time through, either.

Thanks!

Josh 

[Bruce Sherwood]

Alas, rate and waitfor statements cannot be inside functions. In your case a fix is trivial: delete the rate(1000) statement. Another approach is to put the function content inside your while loop, executed when a global variable has been set to True in a button function. Yet another approach is to write your code in an "asynchronous" style. See for example this:

http://www.glowscript.org/#/user/GlowScriptDemos/folder/Examples/program/Bounce-Callbacks-VPython/edit

As for graph deletion, here's the graph documentation (but I think this capability may have been added later than version 2.1):

Deleting data or an entire graph

If you create a gcurve, gdots, gvbars, or ghbars entity and name it g, you can delete the associated data from a graph by saying g.delete(). Similarly, if you say gd = graph(), you can delete the entire graph by saying gd.delete().

[Bruce Sherwood]

Actually, graph deletion options do seem to be available in version 2.1.

[Josh Gates]

Yes - they worked great, as did the rate removal. Thanks for the help!

jg

On Fri, Jul 28, 2017 at 10:35 AM, Bruce Sherwood <bruce.s...@gmail.com> wrote:

Actually, graph deletion options do seem to be available in version 2.1.

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Joshua Gates