i want to plot120 files with gnuplot.
plot '18205.plot' u 1:3 w l t '18205' , '18208.plot' u 1:3 w l t '18208'
Failed to initialize wxWidgets.
warning: Warning - difficulty fitting plot titles into key
warning: Too many axis ticks requested (>1e+01)
warning: Too many axis ticks requested (>1e+01)
warning: Too many axis ticks requested (>6)
the files looking like
21 4 0.865671
22 4 0.894175
23 4 0.921895
24 4 0.949053
25 4 0.975792
26 4 1.00147
27 4 1.02577
28 4 1.05008
Apparently this is it failing to detect a terminal it likes. On my Debian stable "gnuplot 4.4 patchlevel 0" I get an identical error until I add some:
set terminal png
...at which point it works fine. Raaage!
The important bit is this:
Failed to initialize wxWidgets.
This means that gnuplot couldn't open a window to plot using wxWidgets.
Be sure that the terminal where you are running gnuplot can open windows in X. You can do that by typing echo $DISPLAY in the terminal (or !echo $DISPLAY from within gnuplot) and checking if it's not empty and if it makes sense (usually this means a value of :0.0. If it should be anything different, you should know that because you have set it up that way ;) ).
Setting the right X permissions is also necessary if you are running gnuplot as a different user (or on a different host e.g. via ssh) than the one running the graphic environment. in a secure environment xhost + would do, but if you are on a network and specially not behind a firewall, xhost server-running-gnuplot.domain would be a much wiser choice.
I was getting the same errors. However, I realised that I did not have X permissions in my current terminal window. This would explain why switching terminal formats to non-X (ie. jpg/png) worked for the guys above as well.
As the warning suggest you probably have too many keys in you plot. Try leaving away the titles and set key off.
Also you might want to take a look at iterations like in THIS blog at the bottom. This would clean up your script quite a lot.
You might want to ask yourself if you really want to plot 120 lines in a singe plot!?
just set area size, such as:
set terminal png size 1500 1200
and then plot
I was getting the same error. Switching to a different output format fixed it for me.
To have your graph be a jpg:
set term jpeg
To see all possible output formats:
help term
Related
I am using gnuplot over ssh (-X) and due to different screen resolution issues, my x11 output window has minuscule fonts. I want to access the .Xdefaults file as mentioned in documentation but cannot locate it. This question GNUPLOT_DRIVER_DIRECTORY pointed towards some solution but I don't want to input it every time. Can someone help me find a permanent fix for font sizes?
What is your default terminal ? I think it shoulds be xterm, to have x11 as defaults.
shell> echo $TERM
What is yout default gnuplot terminal display ?
gnuplot> show term
Instruction in ~/.Xdefaults have a special syntax (some example in linuxcertif.com/man/1/gnuplot/ ). But i think that's not what you want to do. This is more for 'fine tuning'. And i think it will only be effective if your default terminal is allready x11.
gnuplot*pointsize: 2
gnuplot*background: white
gnuplot*textColor: black
Anyway, it is better to use gnuplot with a text file : file.gp where you put your commands. Then just put in the beginning of your file :
set term x11 font "arial,15"
And execute your file with :
shell> gnuplot file.gp -
do not forget the 'dash' '-' at the end of the command, so that you can continue to put command in the gnuplot prompt to debug additional command.
I haven't found anything to my specific Problem with Gnuplot in other Threads. I want to load a text file on Mac. When I tell Gnuplot to
load '/Users/name/Desktop/test.rtf'
it always says Cannot open script file.
I already made sure, that I'm in the right working directory (I guess):
pwd
gives /Users/name
The text file contains:
plot sin(x)
and the standard terminal I'm using is
terminal type is wxt 0 enhanced
I hope someone can help me with that, since I'm not experienced in using programs with the terminal, so I really don't know how to solve my Problem right here.
first of all thanks for your answer! So I just managed to find my mistake, it seems that it has to do something with the notation, since I'm working on a german Mac. So
load 'file'
makes Problems, while
load "file"
works fine for me. Unfortunately I still have the Problem, that
set terminal postscript eps enhanced
set output "/Users/name/Desktop/testplot 2.png"
set encoding default
p sin(x)
set terminal wxt 0 enhanced
gives me a file, that can't be opened and it says the file is probably damaged or the format is not supported by 'preview'. It is not a huge problem actually since I can save the plot manually from the wxt terminal, but I really don't understand what Gnuplot is doing on OS X...
In Matlab I'm plotting a matrix (let's call it M) using imagesc over an image using imshow. I would like M to have a degree of transparency so I can actually see the image below. This is what I'm doing:
imshow(img); hold on;
h = imagesc(M);
set(h,'AlphaData',0.4); % set transparency to 40%
However, the last line generates an error when running it on Linux. I've been trying to solve it but nothing seems to work. I wonder if there is an alternative to the "AlphaData" property to make it transparent. Thanks!
EDIT: I'm using Matlab R2014a and Java 1.7 on a Linux CentOS 6.6
As Luis Mendo suggested, I just needed to change the renderer. You can:
>get(gcf,'renderer'); % to see which render engine is Matlab using
>set(gcf,'renderer'); % to get a list with all the possible renderers in your machine
So, at least in Linux, to change the renderer it's necessary to start Matlab from terminal by calling it as:
matlab -softwareopengl
Once this is done, setting transparency in an specific plot, as shown in the description of the question, is possible.
i have a gnuplot script file to fit measurement data, using this structure:
set terminal png
...some format templates...
f(x) = a + b*x + c*x**2
fit f(x) "datafile.txt" using "X":"Y" via a, b, c
...some plotting commands etc...
with this, gnuplot shows some strange behaviour:
when i run the script as-is, it gives me the following error:
Undefined value during function evaluation
"myscriptfile.gnuplot", line 5: error during fit
when i move the set terminal png line after the fit line, it runs without a hassle.
normally, i'm loading this at the beginning of a master script containing format templates and further data processing routines. doing this also gives me the aforementioned error message, even with the moved set terminal command.
since this is just the first part of processing my data i really need it to work from the master script... i already tried setting initial guesses, FIT_LIMIT and loading it from a gnuplot environment. i'm using gnuplot 4.6.5.
does anyone know how to solve this or how fit gets influenced by other commands? or is this some kind of bug?
edit: uploaded a stripped down version of scripts and data files to here. with the reduced data files the computed fits don't concur with the measured points, but with the complete data they do.
I'm not sure, what the real error is, but it seems to be related to your use of using "PHEAT":"RHOT", although that should be fine.
I could reproduce your error with the following minimal setup:
A data file test.dat:
A B
1 2
2 3
3 4
and a file test.gp:
f(x) = a*x**2 + b*x + c
fit f(x) 'test.dat' using "A":"B" via a,b,c
If I call this file with gnuplot test.gp I get the same error as you. It doesn't appear if I use using 1:2. If I paste the code in an interactive terminal, the error also appears, but only once. If I repeat only the fit command again, it works fine. I'll report this as a bug.
In the script you posted, I was also able to fix this by using using 9:8 instead of using "PHEAT":"RHOT". Additionally you must remove the first line of the data file, which can be done on-the-fly with tail, so that you can leave the using statements of the plot unchanged. So you can use:
fit rhotside(x) "< tail -n +2 testdata.txt" using 9:8 via rhot0, rhot1, rhot2
fit rcoldside(x) "< tail -n +2 testdata2.txt" using 9:8 via rcold0, rcold1, rcold2
I'm trying to make a graph with gnuplot. I specified my xrange, yrange, and labels, but when I typed in the following command:
gnuplot> plot "data.txt" using 1:2 with lines
gnuplot tells me:
warning: Skipping unreadable file "data.txt" No data in plot.
I don't understand how my data file is unreadable. This is what my data.txt looks like:
X Y [I didn't enter X and Y into my text file]
10000 0.030
5000 0.02
1000 0.012
I know I must be doing something wrong -- this is my first time using gnuplot. I tried doing a Google search on how to make a proper data.txt file turns up zilch.
EDIT:
I feel like this may sound strange to ask at a programming Q&A site, but what should a typical text file w/data look like? I'm no computer programmer, just an undergrad trying to plot a graph for her biochemistry class.
Either as most people answered: the file doesn't exist / you're not specifying the path correctly.
Or, you're simply writing the syntax wrong (which you can't know unless you know what it should be like, right?, especially when in the "help" itself, it's wrong).
For gnuplot 4.6.0 on windows 7, terminal type set to windows
Make sure you specify the file's whole path to avoid looking for it where it's not (default seems to be "documents")
Make sure you use this syntax:
plot 'path\path\desireddatafile.txt'
NOT
plot "< path\path\desireddatafile.txt>"
NOR
plot "path\path\desireddatafile.txt"
also make sure your file is in the right format, like for .txt file format ANSI, not Unicode and such.
plot "data.txt" using 1:2 with lines
works for me. Do you actually have blank lines in your data file? That will cause an empty plot. Can you see a plot without data? Like plot x*x. If not, then your terminal might not be set up correctly.
Create your Datafile like this:
# X Y
10000.0 0.01
100000.0 0.05
1000000.0 0.45
And plot it with
$ gnuplot -p -e "plot 'filename.dat'"
There is a good tutorial: http://www.gnuplotting.org/introduction/plotting-data/
For future reference, I had the same problem
"warning: Skipping unreadable file"
under Linux. The reason was that I love using Tab-completing and in gnuplot this added a whitespace at the end that I did not really notice
gnuplot> plot "./datafile.txt "
I had the same issue when tried to open the file using Plot->Data filename... option provided in the version for Windows 7 (by the way, it worked fine on another computer with the same version of the OP system).
Then I tried to change directory and save the .plt file, but it didn't work either. Finally, I tried to tape manually as it was showed for Linux earlier in this queue of posts:
gnuplot > plot "./datafile.dat"
and it worked!
This error usually means the file couldn't be found.
Can you see the file from the command line?
Try specifying the full pathname.
check line ending type (use 0x0d).
is file open in another program?
do you have read access to it?
I was having the exact same issue. The problem that I was having is that I hadn't saved the .plt file that I was typing into yet. The fix: I saved the .plt file in the same directory as the data that I was trying to plot and suddenly it worked! If they are in the same directory, you don't even need to specify a path, you can just put in the file name.
Below is exactly what was happening to me, and how I fixed it. The first line shows the problem we were both having. I saved in the second line, and the third line worked!
gnuplot> plot 'c:/Documents and Settings/User/Desktop/data.dat'
warning: Skipping unreadable file c:/Documents and Settings/User/Desktop/data.dat
No data in plot
gnuplot> save 'c:/Documents and Settings/User/Desktop/myfile.plt'
gnuplot> plot 'c:/Documents and Settings/User/Desktop/data.dat'
Just go to the properties of your cmd.exe shortcut and change the 'start in' by adding the file name where you put all your '.txt' files.I had same problems and i put the whole file mane as 'D:\photon' in the 'start in' of the properties and it worked.Remember you have to put all your files in that folder otherwise you have to create many shortcuts for each data files.Sorry for late reply