I have a tab-separated data file containing a number of (double-blank-line-separated) datasets and I want to plot a line for each of them. I want to be able to set the linetype (by this I'm referring to solid/dashed/dotted). I want each line to be a different color.
I can plot them all different colors using this:
plot 'example.dat' using 1:2:(column(-2)) with lines linecolor variable
And I can set the linetype but plot them all the same color using this:
plot 'example.dat' using 1:2:(column(-2)) with lines linetype 5
But when I combine them, the linetype is not what I set it to (in this case I just get a solid line).
plot 'example.dat' using 1:2:(column(-2)) with lines \
linetype 5 linecolor variable
Is there a way to achieve this?
I'm using gnuplot 4.6, tried with the x11 and postscript terminals.
This looks like a bug to me. Unfortunately, I don't think too many gnuplot devs hang out on StackOverflow, so we might not ever find out. (I would encourage you to submit a bug report though and keep me updated on any progress that might be made)...
If you're really using column(-2) to pick out the colors, the problem becomes a lot easier and you should be able to do that using plot iteration (as long as you know an upper limit on the number of datasets).
NDSET=3 #This will issue a warning if NDSET is too big, but will still work.
plot for [IDX=0:NDSET] 'example.dat' index IDX using 1:2 with lines linetype 5 linecolor IDX+1
The indexing starts from 0 and corresponds to column(-2). Linecolor 0 isn't defined (I don't know why gnuplot uses two different conventions here -- I suppose because in theory the colors corresponding to any particular linestyle are terminal dependent, so it doesn't really matter too much anyway...)
Related
I'm using GNUPlot.Simple for Haskell and am trying to change the colour of my plots.
Specifically when I use the code:
plotListsStyle [][ ((PlotStyle {plotType = Lines, lineSpec = CustomStyle [ PointSize 0.1, LineTitle "First "] }) , ( zip [0..10] [0..10]))]
I want to change the colour of the plot.
I tried looking at the source code here https://www.stackage.org/haddock/nightly-2022-01-23/gnuplot-0.5.6.1/Graphics-Gnuplot-Simple.html, but couldn't figure out if there is anyway to do this.
Does anyone know how to do this or can recommend an alternative?
Thanks
From a quick look at the summary page in your link, it seems that the Simple variant of the Haskell wrapper does not provide a means to access the "linecolor" attribute of lines, points, etc. So you get only the default colors.
On the other hand, if the script it produces is fed to a standard build of gnuplot then the program will on entry read a system- and/or user- initialization script. So you could change the default line colors in that initialization script and the change would affect subsequent execution of scripts produced by your Haskell wrapper.
For example, if you want the color of the first plot to be green and the second plot cyan, you could place the lines
set linetype 1 linecolor "forest-green"
set linetype 2 linecolor "cyan"
in the file ~/.gnuplot. That would replace the first two colors of the default sequence.
I try to create a nice waterfall map with gnuplot showing the development of an optical spectrum with current. My goal is to achieve something close to this :
A waterfall plot
I have tried this command
splot [][1160:1200][-80:-30] "Waterfall.txt" u 1:2:3 w l lw 3 lc rgb 'black'
The "Waterfall.txt" file has the format suggested in the accepted answer here Gnuplot: fence plot from data.
I have ignored z-data values lower than -80, substituting them with NaN.
The outcome is shown in the next image link.
My attempt
As you can see, compared with the previous figure, this is confusing to the reader. How can I fix it in order for it to be close to the first image and thus more clear to the viewer ?
Edit:
Thanks to #Ethan's answer it worked. The outcome is shown in the figure below. The only problem is the transparency of each fence, that reveals partially the subsequent fences.
The new attempt
Assume twenty 2D files each containing Y and Z:
Gnuplot version 5.2
filename(i) = 'silver.dat'
set pm3d scansauto
set style fill solid noborder
set xyplane at 0
set log z
unset key
splot for [k=20:1:-1] filename(k) using 1:(k):2:(1.0):2 with zerrorfill \
fc "white" lc "black" lw 2
I don't have your data files so I use the same file 20 times for the purpose of illustration. It is based on the zerror demo in the gnuplot distribution and online demo set.
Note that the base of each 'fence' is set to (z=1.0) rather than zero because of the log scale on z.
The figure shown was made using a newer gnuplot. It uses partial transparency and a fancier bounding box that isn't in 5.2
I have a file with scattered data (points located approximatelly on the vertices of a regular grid): first two columns are the x and y coordinates, then a few more columns with other data that I need to plot. I want to obtain color maps that represent this data, and since points are scattered I'm using dgrid3d to generate a regular grid and have a smoother representation. My problem is that when I set dgrid3d, gnuplot ignores the x and y ranges and plot the grid outside the figure frame. Bellow is a minimal script to reproduce my problem:
set view map
set yrange [0.4:0.8]
set xrange [0.2:0.8]
set pm3d
set style data lines
set dgrid3d 100,100,4
splot "./Terr.dat" using 1:2:(log($6)) pal
The result that I obtain is the following image:
Setting the option clip1in or clip4in of pm3d has no effect. If I unset view so that the result is a 3D surface, it also ignores the x and y ranges. I could easily write an script to pre-process the data and remove the points outside the range I want, but gnuplot should be able to manage this. Any idea?
I'm using gnuplot 4.2 patchlevel 6
Thanks!
I'm not sure that I am able to reproduce your problem, but there are a few funny things with your script. I'm not exactly sure what the line set style data lines is supposed to do in this context as you're plotting with pm3d. I created a simple datafile:
0 1 4
1 0 5
0 0 2
1 1 3
And I plotted it using this script:
set view map
set yrange [0.4:0.8]
set xrange [0.2:0.8]
set dgrid3d 100,100,4
splot 'test.dat' u 1:2:3 w pm3d
And it seemed to "work" (I'm using gnuplot 4.6.0).
There are a few things of note however -- Notice that every point in my original domain was out of the given x and y ranges. Gnuplot still used those points when constructing the surface. This is also demonstrates reasonably nicely what the gnuplot weighting function looks like (although we could do even better by using only 1 point in our data file.)
UPDATE
Between my 2 computers, I have access to gnuplot4.2.6, gnuplot4.3.0, gnuplot4.4.2, gnuplot4.6.0, gnuplot4.6.1 and gnuplot4.7.0. gnuplot4.2.6 is the only version which exhibits the behavior you describe. It looks to me like they changed the behavior of pm3d in the 4.3 CVS branch, but didn't push those changes back into gnuplot4.2. The easy fix is to upgrade to gnuplot4.6 -- I've been using it as my default gnuplot for a few months now and it seems to be pretty stable.
I am using Gnuplot to successfully plot some time series data. However, the series are fairly dense (10,000's of samples in about 5 inches of space), and when I plot multiple series, it is hard to see underneath the series that was plotted on top. Is there any way to make the lines have a bit of opacity or transparency (i.e. make the line transparent so underneath lines are visible)?
Excel has this capability, but I would much prefer to use Gnuplot.
Below is a sample of what I'm talking about. You can't see the red lines under the green lines. I would actually like to add a third time series. I am plotting with the command:
plot [][-3:3] 'samples_all.csv' using 1:7 title 'horizontal' w l ls 1, '' using 1:8 title 'vertical' w l ls 2"
Good news! This has been implemented in gnuplot. Example syntax is
plot x lw 10, -x lw 10 lc rgb "#77000000"
This will plot x as a red line and -x as a transparent black line (it looks gray). The first pair of two characters in the rgb specification define the alpha (transparency) channel ("#AARRGGBB"). The normal syntax ("#RRGGBB") still works.
old (gnuplot < 5.0 or so) answer for reference:
If you want to make lines plotted for time series data, the answer is no (see discussion here). You can't set a line style to be transparent. Transparency only works for filling under curves, and it has to be printed to the right terminal type.
I ran into this problem myself recently, I hope this feature will be added in a future version of gnuplot.
This may be what you're looking for.
I am trying to plot (with Gnuplot) some basic 3d data from one file which is pretty much like that:
N M t1 t2 t3 t4
1000 1000 0.05268 0.04711 0.003947 0.003348
1000 2000 0.05743 0.04214 0.007577 0.006486
1000 3000 0.08465 0.04193 0.011329 0.009654
2000 1000 0.10726 0.08845 0.013593 0.012397
2000 2000 0.21065 0.10817 0.026525 0.024390
2000 3000 0.31528 0.16960 0.039772 0.036405
3000 1000 0.25415 0.14845 0.031082 0.026364
3000 2000 0.47345 0.25227 0.060887 0.051840
3000 3000 0.70612 0.36866 0.091311 0.077432
The idea is to plot it in some way I could see t1,t2,t3 and t4 for each N and M. It may be a lot of data to plot in only one graph, I know that. First of all, I have started with t1 plotting this way:
splot 'aux' u 1:2:3 w lp
and I get something like that
I would like to smooth a bit those lines and give them a different color. Is there any way to do something for it? Also any ideas to improve it in any other way would be very nice.
You're right, that is a lot of data. Changing the color of a particular dataset is pretty easy:
splot "dataset" using 1:2:3 w lines linecolor rgb "green"
Note that you can easily overlay multiple plots as follows:
splot "dataset" using 1:2:3 w lines lc rgb "green",\
"" using 1:2:4 w lines lc rgb "red"
A backslash at the end of a line is the gnuplot line-continuation character. Note that it must be the last character on the line. I've also used the pseudo-file "" which is just shorthand for the last file that gnuplot read. Finally, in this second version I used lc instead of linecolor. The gnuplot parser provides a lot of shorthand, although I suspect you already know this since you plotted w lp. (Also, please don't actually choose red and green for your plots. I think one of the biggest flaws in gnuplot is the default first 2 colors are red and green -- 1 in 20 people is red-green colorblind)
Smoothing is another story (unfortunately). plot does support a smooth option
plot "dataset" using 1:2 smooth beizer with lines #see help smooth for a list of options
Unfortunately, it appears that this option doesn't work for splot. At this point, I would write a small utility script to smooth the data in your favorite language using your favorite smoothing algorithm (plot "<utility.script mydata" u 1:2:3 ...). There are other (gnuplot-only) options, but they'd be ugly. What version of gnuplot do you have by the way? The gnuplot version is important to decide the best way to do the smoothing all in gnuplot if you decide that's still necessary.