Re: Time formats [was Re: Feature request - assignment in expressions]

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

On Saturday 12 May 2007 07:13, pl...@pi... wrote:
> My other problem is that the code snip I posted seems to be correctly  
> calculating the areas of the increamental trapezoidal segements but fails  
> to add the existing value of my area variable.
> 
> 
> area=0; started=0;prev_x=0;prev_y=0;
> add_aug(x,y)=assign("area",(started)?\
>                                       area + (x-prev_x)*(y-prev_y)/2.0  
> + 0.0*assign("prev_x",x) + 0.0*assign("prev_y",y) \
>                                      :( 0.0*assign("started",1)  
> + 0.0*assign("prev_x",x) + 0.0*assign("prev_y",y) ) \
>                     );
> 
> 
> plot  datafile   using  
> 1:(add_aug(strptime("%H:%M",stringcolumn(1))/3600*2,P( Th4($3-2.0)   
> -(Th7($5)-0.52) ))) axes x1y2  with lines s f t "aug" \
> 
> 
> 
> So referencing area inside assign("area", ) seems to return zero, whereas  
> the other calls to assign() work and references to the other variables  
> inside assign() produces expected results.
> 
> Can you confirm that bug and hopefully correct it?

Too complicated for my poor brain.  
Please try to reduce this to a much simpler test script
that demonstrates an error.

The obvious test:
	sum(x) = assign("sum",x+sum)
	plot <foo> using 1:($2+0*sum($2))
seems to work just fine

-- 
Ethan A Merritt            Courier Deliveries: 1959 NE Pacific
Dept of Biochemistry
Health Sciences Building
University of Washington - Seattle WA 98195-7742