Re: typo injected an undeclared function into the name space ?

[Ethan A M. <sf...@us...>]

On Friday, 15 January, 2016 11:38:01 pl...@pi... wrote:
> Hi ,
> 
> I accidentally forgot a * operator when plotting a function. This seems 
> to have injected an udefined fn into the name space
> 
> 
> twopi=2*pi
> 
> gnuplot> plot datafile" u ($1/365.25+1970):2 w l, cos (twopi(x)/p3) +0.05
>           undefined function: twopi
> 
> 	User-Defined Functions:
> 	cos1(x)=a1*cos(twopi*(x-phi1)/p1)
> 	cos2(x)=a2*cos(twopi*(x-phi2)/p2)
> 	cos3(x)=a3*cos(twopi*(x-phi3)/p3)
> 	triple(x)=c+cos3(x)
> 	twopi is undefined
> 
> 
> gnuplot>  print twopi
> 6.28318530717959
> 
> 
> Now it won't stop crapping on about "twopi is undefined", even though I 
> have plotted something else and make no reference to it.
> 
> 
> All I can find to clear it is to quit gnuplot.
> 
> Has this , as it seems, injected an undeclared function into the name 
> space ?
> 
> How to clear it more elegantly, is this a bug?

There is currently no way to clear or delete any user-provided function.
That is true for your well-defined functions as well as your undefined
function. The "undefine FOO" command only looks for FOO as a variable
name not as a function name.

If you want to reset the entire namespace you can use "reset session".
Of course that will clear everything, not just the undefined function.

	Ethan