Re: data and function plot causing double assignment

[<pl...@pi...>]

On 10/04/11 17:28, Ethan Merritt wrote:
> 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

Exactly, so why is area still 0 after having been assigned the value 1 
about 512 times?!

I reiterate that if I remove the function plot I do get areas=1 after 
plotting. This indicates that plot is re-executing area0=0 after the 
second data plot and before plotting the function.

/Peter.


> 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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>
>