I am trying to plot a function of two variables represented in tabular form. I would like to label my color bar while representing this as a heatmap. No matter how much I rescale, no luck, and I don't even see the colorbar label appearing. Here is my gnuplot script:
set title "Flux in core vs radius and height"
set view map
set cblabel "Neutron flux (cm^-2 s^-1)"
set xlabel "Radius (cm)"
set ylabel "Axial distance from center (cm)"
splot "flux.out" using 1:2:3 with image
And the result looks like this, lacking a colorbar label:
The cblabel is printed outside the picture. You can manually adjust the margins to make some space for the label:
set lmargin at screen 0.1
set rmargin at screen 0.7
I used at screen because else the picture would be cropped again. And I also set lmargin because else in my test the ylabel would not fit on the page.
Tested with Gnuplot 4.6.
Related
I have a gnuplot SVG terminal. One issue that I'm facing when I output the files and import to powerpoint is that there is a lot of blank space especially at the Top, even though I mention that margin is 0.
Below is the example and the screen shot that shows blankspace when imported in powerpoint.
My question is how to remove blank space so I dont have to trimp or crop using another tool.
reset session
set terminal svg size 600,600 enhanced font 'Verdana,10'
set output 'output.svg'
set view 50,10
set isosample 40
set xlabel "x"
set ylabel "y"
set zlabel "f(x,y)" rotate
set pm3d noborder
set palette rgb 33,13,10
unset colorbox
set lmargin 0
set rmargin 0
set bmargin 0
set tmargin 0
set log cb
set cbrange [0.1 : *]
splot [x=-2:2] [y=-1:3] (1-x)**2+100*(y-x**2)**2 with pm3d notitle
set output
The "set margin" commands in the form you show them are designed to describe the space between the x and y borders of a 2D plot and the edges of the page. Their effect on a 3D plot rotated so that the x/y plot borders are not parallel to the page is non-obvious.
I suggest using instead a different form of the bmargin command that positions the bottom of the 3D view box at a specific screen location, followed by a scaling command to increase the vertical size by a factor of, say 1.6 or so. The vertical scale operates symmetrically above and below the center of the 3D view box. My preference would be to also get rid of the empty space inside the view box by repositioning the base plane to z=0. The additional command and their result is shown here.
set bmargin at screen 0.4 # reposition entire plot upwards
set view 50, 10, 1.0, 1.6 # increase default vertical scale by 1.6
set xyplane at 0 # remove space between base plane and bottom of surface
replot
I am trying to plot two data series plotted in one graph (histogram) using gnuplot. One is Baseline data and other one is Optimized. The script looks like this currently.
n=50
max=0.07946462
min=0.0
reset
width=(max-min)/n #interval width
hist(x,width)=width*floor(x/width)+width/2.0 #function used to map a value
to the intervals
set term png #output terminal and file
set output "histogram.png"
set xrange [min:max]
set yrange [0:]
set style fill solid 0.5 #fillstyle
set termopt enhanced # turn on enhanced text mode
set xlabel "PowerDensity(mA/um2)"
set ylabel "Area(um2)"
set title 'Power Density Histogram'
plot 'power_density_oxili_sptp.txt' u (hist($2,width)):($1) smooth frequency
w boxes lc rgb"blue" title 'Baseline', 'power_density_oxili_sptp.txt' u
(hist($3,width)):($1) smooth frequency w boxes lc rgb"red" title 'Optimized'
The output of this will be as given
enter image description here
The problem here, I am not able to see baseline data (blue) completely,since it is hiding below the optimized data.Either I need to see both data or I need to plot histogram separately in the same graph.
Br
Sree
It looks like you want the two histograms to be transparent. For that you should set the transparent flag in your fillstyle (see help fillstyple):
set style fill transparent solid 0.5
In addition, you need to specify truecolor to get transparent areas from the standard png terminal (see help png):
set term png truecolor
Alternatively you can use the pngcairo terminal.
I'm trying to use multiplot to stack two image plots on top of one another, in a column. When I try to test this with x11 terminal, the images are produced separately, only one visible at a time. When I use the epslatex terminal, which is what I want, then the text is drawn correctly within the LaTeX document, but the EPS portion of the plot is produced as two separate pages, resulting in a figure that is missing a lower half.
Here's the multiplot section of my script:
set multiplot 2,1
set cbrange [-0.4:0.4]
set cbtics -0.4,0.2,0.4
unset xlabel
set tmargin at screen 0.95
set bmargin at screen 0.60
plot data u 1:2:3 with image notitle
set cbrange [-0.1:0.1]
set cbtics -0.1,0.05,0.1
set xlabel "$x$"
set tmargin at screen 0.50
set bmargin at screen 0.15
plot data u 1:2:3 with image notitle
unset multiplot
unset output
What results in the document is this:
I have tried enlarging the vertical size of the plotting area(per this question), but what this does is increase size of each page in the EPS file. To be clear, the product of plotting with epslatex is an EPS file containing two pages, the first with the first plot at the position that I want (near the top), and the second with the second plot at the position that I want (near the bottom).
This normally happens when you are not in multiplot mode. For me, set multiplot 2,1 gives an error message "only valid in the context of an auto-layout command". The command set multiplot layout 2,1 works with Gnuplot 5.0 and 4.6.
As a side note: This behavior can be used to produce animated gifs with set terminal gif animate, each plot command creates a new frame.
I'm trying to model a certain progress through some environment. The x axis would represent the location (based on x coordinate) in the environment.
In order to make this clear, I'd like an image of the environment (based on a .png) on the x axis (the environment is rather wide and not that high, so it should look good) of my plot, basically as an xtics/x-axis label.
Do you have any suggestions on how to approach this?
Thanks in advance!
You can either plot both the image and the data in one plot command, or with multiplot. The first variant is easier, but the image is inside the plot, the other is a bit more complicated, but allows arbitrary positioning of the "axis image".
The dummy image "gradient.png" for the axis is
One plot command:
set yrange[0:1]
set xrange[0:1]
plot 'gradient.png' binary filetype=png dx=0.0015 dy=0.002 with rgbimage t '',\
x**2
The result is:
Using multiplot
set yrange[0:1]
set xrange[0:1]
set lmargin at screen 0.1
set rmargin at screen 0.98
set tmargin at screen 0.98
set bmargin at screen 0.2
set xtics offset 0,-1.5
set xlabel 'xlabel' offset 0,-1.5
set ylabel 'ylabel'
set multiplot
plot x**2
set tmargin at screen 0.2
set bmargin at screen 0.15
unset border
unset tics
unset xlabel
unset ylabel
unset key
set autoscale xy
plot 'gradient.png' binary filetype=png with rgbimage
unset multiplot
As you can see, this requires a bit more effort. To explain the details:
You must set explicit margins so that the axis image can be placed exactly below the main plot.
Before plotting the axis image, you must remove tics, labels, reset ranges to autoscale etc. (Therefore you must also set fixed lmargin and rmargin).
To plot the image itself, use the plotting style with rgbimage.
You must fine-tune the xtics and xlabel offset, as well as the marings.
The resulting image is:
I decided to migrate to the latest version of gnuplot from 4.4 to 4.6
I am having issue with the x label disappearing with version 4.6 but being there with version 4.4.
here is a stripped down version of my script.
set key outside
set title "MY TITLE"
set timefmt "%m/%d/%Y-%H:%M:%S"
set format x "%m/%d %H:%M"
set xdata time
set ylabel "Y LABEL"
set xlabel "Time"
set grid
set xtics rotate by 90 offset 0,-5
set terminal pngcairo size 1000,500 font ",9"
set xtics font ",8.0"
set ytics font ",8.0"
set output 'test.png'
plot '-' using 1:2 with linespoints ti "legend"
01/01/2013-00:15 186557
01/01/2013-01:15 254654
01/01/2013-04:00 180146
01/01/2013-06:15 191059
e
set key inside
I've identified the issue to this line
set xtics rotate by 90 offset 0,-5
Because my label is too long the offset makes it go away
if you remove the offset to
set xtics rotate by 90
Not the label show but in the middle of the chart.
Version 4.4 used to compress the chart to leave room for the label.
I guess my knowledge to gnuplot is limited.
Anyone has an idea?
thanks
UPDATED ANSWER, courtesy of Ethan Merritt
A better way to do this is to change the justification of the labels to being right justified (rather than the default centered).
set xtics rotate by 90 right
This correctly calculates the margin without needing to hardcode a margin size
The label placement here seems a little flaky to me. I think there might be a bug which I'll probably report. One workaround is to explicitly set the location of the "x-axis" via:
set bmargin at screen 0.2
The reason it seems flakey is because with set bmargin at screen 0.2, the xtic labels clearly extend higher than the position of the xlabel. However, if you comment that line out, all of a sudden they don't extend higher than the position of the xlabel.
Here are the plots with and without that line:
Perhaps cairo/pango cut out labels where any portion of the label extends past the visible "canvas" area?
As a side note, the plot also seems to be roughly correct if I use the postscript terminal...