Re: data and function plot causing double assignment

[Ethan M. <merritt@u.washington.edu>]

On Tuesday, 04 October 2011, pl...@pi... wrote:
> Hi,
> 
> I have found what appears to be a defect in variable assignments in plot.
> 
> gauss0(x)=a0*exp(-(x-pk0)**2/b0)+c0
> a1=a0;b1=b0;c1=c0;pk0=-141;
> add_one(x)=area0=1;

This defines the function add_one(x)
to be  add_one(x) =   value of (area0=1)
                  = 1
So add_one(x) = 1 for all x
Any later changes to the value of area0 are not relevant.

	Ethan

> plot  area0=0\
> , datafile using 1:(add_one($2)) w l\
> , datafile using 1:(($2)) w l\
> , gauss0(x) tit 'fitted peak0'\
> 
> print "area0=",area0;
> 
> I was expecting this to do the assignment area0=0 once and once only 
> before any of the lines were plotted.
> 
> It is only assigned once for the datafile plots but adding the function 
> plot causes this snippet to print a value of zero , not one.
> 
> I am inferring that using a mix of data and function plots is causing 
> the initial assignment to be done twice.  Bug or feature?
> 
> best regards, Peter.
> 
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