gnuplot-info

[Gnuplot-info] Fw: Asking a question about gnuplot

[Hamed A. <s.h...@ya...>]

Hi,


I have a data file as matrix form. The values on the x axis are in the first row of this file. The y values  corresponding to the x values are on the following rows.  I want, for example, plot the second row respect to  the first row (first row on the x axis and the second row on the y axis), but i do not know how to do that.
I use, for example this command "plot "filename" matrix using 1:3 every :::1::1" which plot second row but with its arbitrary x values. I want to use first row as x values. My data file looks like this:
First row:            x1    x2     x3     x4    .....
Second row:      y1    y2     y3      y4     ......
(y1 corresponds to x1 and y2 to x2 and etc.)


Thanks,

Re: [Gnuplot-info] Fw: Asking a question about gnuplot

[Hans-Bernhard B. <HBB...@t-...>]

On 05.02.2014 21:30, Hamed Ahmadi wrote:

> I have a data file as matrix form.

As far as gnuplot's use of the term is concerned, that sentence directly 
contradicts the following two:

 > The values on the x axis are in
> the first row of this file. The y values  corresponding to the x
> values are on the following rows.

A file in that format is not in matrix form as understood by gnuplot.

Your data file format is not really usable by gnuplot as-is.  If at all 
possible, you should transpose it, i.e. make columns out of rows and 
vice versa.  Then a simple

     plot 'filename' using 1:3

will display what you want.