Re: [Gnuplot-info] defining function in gnuplot

[<as...@ca...>]

Hi Tatjana!

On 3/7/07, Tatjana Skrbic <sk...@si...> wrote:
>
>
> Dear All,
>
> I would like to if it is possible in gnuplot to define a function
> (using ternany operator) whose values are the result of some
> operations on the data stored in a given data-file.


You can define a function in the usual way. Suppose we want to determine an=
d
plot the max. of the data stored on two different columns of the date file.
So first, we could define the function "max" as:

gnuplot> max(x,y)=3D(x>y?x:y)

In this case, if x>y it the result will be x, otherwise y.
Then we could use this funciton to analize the data:

gnuplot> plot 'mydatafile.dat' u 1:(max($2,$3)) w p

This statment will plot a graph with points using the contents of column 1
as the x-axis, and the max value between columns 2 and 3 for the y axis.

Bye!




Any info will be highly appreciated.
> Best regards from Tatjana.
>
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