what software you use for obtaining graphs by data?
 

which software is better to draw x-y graphs in ubuntu?(there are columns of data i obtained by postProcessing OF)

The answer depends on everyone's opinion/like and dislike. Personally, my preference is gnuplot.

thanks Julien
whats the command for making a graoh of a file containing columns of x and y?
and how can save the graph that is obtained?
can do this in LibreOffice Calc in your opinion?
whats your opinion about SciDAVis?have you worked with it?

For the datafile format you describe, you could start with

Depends on what you want exactly.

will save a .png file of your plot.
For everything beyond this point, my favorite site is:

http://web.archive.org/web/201007261...t/index-e.html

thanks Alex
that site is banned here.could you give me another link?

What a pity! This really is the best site for gnuplot.
You could try to google for "gnuplot not so frequently asked questions" and see if there is another archive of this page you are allowed to view.

This would be another one
http://lowrank.net/gnuplot/index-e.html
http://www.ualberta.ca/~xz10/gnuplot/index-e.html

we have both internal and external censorship here!
is this link good enough?http://heim.ifi.uio.no/inf3330/scrip...o/index-e.html
read what parts?

This looks like an older version of Kawanos gnuplot site, so yes, it has all the information you need.
Since gnuplot has a learning curve, be prepared to spend a few hours before your first plot looks exactly the way you want it to. Consequently, you will have to start with the "introduction to gnuplot" section.
If you have any specific questions you cant figure out by yourself, feel free to ask.

Yust one hint: put your gnuplot commands in a text file instead of typing them in the shell. This way, you wont have to repeat all commands to produce similar plots.
Load the commands in gnuplot via
load 'textfile.plt'

I have plot this figure with below commands in a file:
but it doesn't appear so good,the titles are on graphs,how can make it better?

There are many ways to improve on the look of the figure.
First of all, the png-terminal has to go. Try "set terminal pngcairo" instead of "set terminal png".
The figure will look way better with this terminal.

For the key placement and the other options of the key, type "help set key" in gnuplot.
I guess something like "set key outside top right" will do the trick.

And another hint: putting "reset" in the first line of your file will make sure you only get the settings you specify in this file.
Changing the terminal type once again at the end of the file, for example by putting "set terminal wxt" in the last line will prevent some mysterious bugs...

Thanks Alex,
it is like this now.
how can extend the x axis and decrease legend area? :)

I am not sure what you mean by "extend the x-axis"
You could adjust the range
or adjust the size of the plot
Type "help margin" for more info on how to adjust the margins of the figure.
And please attach figures as figures ;)

I want x-axis be longer with more labels,
it shows an error of "invalid file" so I have to compress it so that be in gzip format.

excluding "(" character
 

in U column there are some exess ('s,how can exclude them in gnuplot?
this is the error that gnuplot shows:

I found this that seems contains what I needmbut its banned!
http://codejourneys.blogspot.com/200...ot-basics.html

Try to play around with the margin settings ("set lmargin a" and "set rmargin b" with low integer values for a and b).
You can also try to adjust the size of the plot by "set size 1.2,1.0" or something in that range.
To control the number of labels, use "set xtics start_value, increment" will do.
Again, gnuplot has some sort of documentation on this topic "help set xtics"

I dont know if this is possible in gnuplot, but any text editor has a search&replace functionality if you have no influence on the format of the datafile directly.

The site has some very basic information, but the "not so frequently asked questions" page has the same information and a lot more.

thanks Alex,
how can increase the distance between points in linepoints style?
in the image points are too close and it seems like a continous line.

in this data file,some lines aren't in proper position in the column,how can automatically fix it?

and do you mean this site by "not so frequently asked questions"?
http://t16web.lanl.gov/Kawano/gnuplot/index-e.html
it can't be open.

This can be achieved wit the "every" plot option.
will only plot every 5th point in your data set.
Edit:
With the linepoints stile, I guess you want to have every data point for the line to have a smooth line but only few points for the points...
I did that plotting the same data twice, once as a line and a second time with points using the every option.
The drawback is that you cant have the same representation of the linestyle in the key automatically as far as I know. Some editing of the figure will be required.

Why would you need to fix that? Gnuplot doesnt care about the "look" of the datafile as long as there are datafile separators between each column.
The only issue with this datafile are the brackets. But we already had that.

Didnt we find a version of this page that you have access to?

but it doesn't plot the data files I've attache them by this error:
I've attached the gnuplot code used.

But that works for another case with attached files.
do you mean that its not possible to plot with linepoints style so that line be continuous and points plot every 5 points as you mentioned? then I have to use only points style for that?

this error shown when I added "every" option,what may be the cause?

Seriously, why dont you erase the brackets in the datafiles?

I mean that you cant have the correct representation of that line style in the key automatically, because the line with dots will actually consist of two plots.
With the method I described, the line within the plot will be continuous and contain all data points, while there will only be few points to enhance visibility.

I dont think it is a good idea to have the every option at the end of the plot prompt.
Not 100% sure about the correct sequence, so try one of the following

I don't think it be because of parentheses,because it was plotting other columns without parentheses in previous data files,however I deleted parentheses but the error has remained,although its appearance has changed.:confused:

Greetings to all!

I don't have much time to spare today, so I can't play with gnuplot myself :(. Nonetheless, here are the instructions for installing the gnuplot documentation and example on Ubuntu:

1. Install the documents and examples:
   
   Code:

   ---

   sudo apt-get install gnuplot-doc

   ---

2. Open the main HTML page on Firefox:
   
   Code:

   ---

   firefox /usr/share/doc/gnuplot-doc/html/index.html

   ---

   This is the main page for the documentation for gnuplot.
3. You can find the examples at the folder:
   
   Code:

   ---

   /usr/share/doc/gnuplot-doc/examples/

   ---

Good luck! Best regards,
Bruno

Hi
that resolved,the ranges wasn't appropriate,
but I didn't grasp how to set linestyles to have lines and points concurrently and points be less.:confused:

it resolved,thanks,
the attached is the result with this command:

an issue is that the output page that graph is plotted on that has fixed size.
my data's are very high in numbers in x-axis side.I want my graph be wider without need to make it smaller in y-direction by size commands.I want to have a more wider page in fact rather than a smaller graph in the same page output.
is there any way to change dimensions of output page?
it seems it has compacted in x-direction now.

another issue is that is it possible to do some calculations on columns before plotting by gnuplot,like multiplying one column to another column and divide by a constant?

You can directly specify the size of the png-file.
will result in a a figure of 1200*600 pixels.

This works almost the same way as in M$ Excel.
will plot plot the second column multiplied by 5 over the first column. The $ character denotes the column number.

thanks Alex,
how I should act if I want to for example subtract two columns in two data files from each other?

I have no idea, and apparently, there is no way to do this in gnuplot directly.
But google seems to know another way to do this if you search for "gnuplot compare two files" and hit the first result.
You can be sure that EVERY question you might have concerning gnuplot has already been answered somewhere on the web.

in this link:
http://objectmix.com/graphics/139945...le-figure.html
it says to use: plot '< join fileA.dat fileB.dat' using 1:N+1

how can add all numbers in a column in gnuplot and the number of figures(for obtaining an average of them)?

this page seems to have some information about averaging in gnuplot but is banned here:(
can anyone help to read the page or know about averaging in gnuplot?:)
http://gnuplot-tricks.blogspot.com/

http://www.phyast.pitt.edu/~zov1/gnu...tatistics.html

thanks Alex,then how I have to use averaging?

I found this also,but isn't clear what have to do exactly.:confused:
http://www.manpagez.com/info/gnuplot...nuplot_419.php

how can draw two sided arrows for specifying a part of plot parallel to x-direction?(arrow be in x-axis to distinguish a part of plot over a period of time)
for example in the figure attached I want to distinct 0.0347 till 0.0355 by an arrow.
(is there a way to send this type of figures as image?)