Reading variable with double float precision from a text file with gnuplot

Posted by user3636322 on Stack Overflow See other posts from Stack Overflow or by user3636322
Published on 2014-06-04T15:22:34Z Indexed on 2014/06/04 15:24 UTC
Read the original article Hit count: 135

Filed under:

gnuplot

I have a text file, containing data in 3 columns like below:

0.0100000000 | 0.0058077299 | -0.0000000288

0.0110000000 | 0.0075128707 | -0.0000000373

0.0120000000 | 0.0093579693 | -0.0000000465

I want to get the variables from this file in gnuplot and use them to draw graphs:

What I exactly do is like below (e.g: to pick the variable from row 2 column 3):

ii= 2

a_0 = system("awk '{ if (NR == " . ii . ") printf \"%f\", $3}' " .datafile)

a_0 = a_0+0.

but what is written as a_0 is zero!

How can I increase the precision to get the exact value?

Related posts about gnuplot

gnuplot: x11 terminal in "interactive mode" while calling gnuplot from shell

as seen on Stack Overflow - Search for 'Stack Overflow'
Hey there, I want to call gnuplot with a shell command, all the commands are stored in, let's say, "load.gp". If I start the gnuplot shell and type "load 'load.gp'" I can change the viewpoint by dragging the splot with the mouse around. The Problem is, I can't figure out how to reach that without… >>> More
Visualization of Nelder-Mead algorithm in gnuplot

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, does anyone know how I can achieve drawing triangle on level sets of some 3d function (something like on this image in gnuplot? When I tried doing this after reading some tutorials: gnuplot> set border 15 front linetype -1 linewidth 1.000 gnuplot> set logscale z 10 gnuplot> set view… >>> More
Error with TextMate 2 --shell-escape and gnuplot 10.8.2

as seen on Super User - Search for 'Super User'
I have had TM 1.X since a long time ago, but a week ago I updated my system to Mountain Lion 10.8.2 and installed TM2. The problem is that I write with LaTeX, and sometimes I use gnuplot for the graphs (I installed gnuplot with macports). But now it doesn't work because the --shell-escape doesn't… >>> More
Histogram using gnuplot?

as seen on Stack Overflow - Search for 'Stack Overflow'
I know how to create a histogram (just use "with boxes") in gnuplot if my .dat file already has properly binned data. Is there a way to take a list of numbers and have gnuplot provide a histogram based on ranges and bin sizes the user provides? >>> More
gnuplot: display only the roots.

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, Gnuplot, a great package ... I'm in love with it. But we can have our tiffs as well, as any couple :-) This time, I wanted to simply plot the roots of an equation: say a quadratic to keep things simple. However, I only want two nice round dots appearing on the x-axis representing the point where… >>> More

Developer IT

Reading variable with double float precision from a text file with gnuplot - Developer IT

Reading variable with double float precision from a text file with gnuplot

gnuplot

Related posts about gnuplot

gnuplot: x11 terminal in "interactive mode" while calling gnuplot from shell

Visualization of Nelder-Mead algorithm in gnuplot

Error with TextMate 2 --shell-escape and gnuplot 10.8.2

Histogram using gnuplot?

gnuplot: display only the roots.

Categories cloud