graph does not appear

this code was working earlier. it showed all the graphs but is not working now. what should i do?

[Adam Danz]

Not enough info.

Are you getting an error?

What plot do you expect? I don't see any plotting functions but I do see unfamiliar functions that aren't provided by matlab.

What have you tried to fix it or to investigate it?

Is there anything in the command window?

[Shubhangi Singh]

Plot functions are in editor window where these functions are defined. Earlier it was working giving exponentially decaying sinusoidal function, but has stopped working without any error.