Re: [Gnuplot-bugs] differences between u 1:2 and using ($1):($2)

[Thomas S. <t.s...@fz...>]

"$1" is a shorthand for "column(1)", but for timedata you need to use
"timecolumn(1)":

plot 'timedata" using (timecolumn(1)):(($2)*($3))

on the other hand,
plot 'timedata" using 1:(($2)*($3))
should also work.


Javier Galan wrote:
> 
> Hi,
> 
> I have found out that when creating a plot with time format in the x-axis,
> using comands
> 
> set timefmt "%s"
> set xdata time
> 
> there is a difference in the use of the column specifier.
> 
> There is no problem by using the reduced form.
> 
> plot "timedata" u 1:2
> 
> works perfectly,
> 
> however when using as
> 
> plot 'timedata" using ($1):($2)
> 
> the time data is not properly interpreted.
> 
> This is a problem when somebody wants to create this kind of plot by
> producing a mathematical operation in the y-axis,
> 
> as it could be ...
> 
> plot 'timedata" using ($1):(($2)*($3))
> 
> cheers,
>   Javier
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