I have a graph that looks like this:
I want to increase the size of the points in the legend (is it legend or key?) but without increasing the size of the points in the plot.
It's explained better in the picture. Can this be achieved?
First plot nothing with increased symbol size, then plot the data without the key.
gnuplot> plot 1/0 ls 7 lw 6 with points t "0.0", "yourdata" ls 7 notitle
Use the same point style for both of the plots, and rename the first plot key as you wish.
Unless you are using filled circles (pt 7) you may want to adopt this improvement of the Jari's answer which looks better as the points in the key are less fatty and more elegant:
plo 1/0 w p lc 1 pt 1 lw 3 ps 3 t "Data 1", "data1.dat" lc 1 pt 1 notitle,\
1/0 w p lc 3 pt 2 lw 3 ps 3 t "Data 2", "data2.dat" lc 3 pt 2 notitle
Related
I am a beginner in gnuplot. Recently I tried to visualize a pressure field on adaptive mesh.
Firstly I got the coordinates of nodes and center of the cell and the pressure value at the center of the cell.
And, I found something difficult to deal with. That is the coordinates in x and y directions are not regular, which made me feel hard in preparing the format of source data. For regular and equal rectangular case, I can do something just like x-y-z format. But is there any successful case in adaptive mesh?
I understand that you have some x,y,z data which is in no regular grid (well, your adaptive mesh).
I'm not fully sure whether this is what you are looking for, but
gnuplot can grid the data for you, i.e. inter-/extrapolating your data within a regular grid and then plot it.
Check help dgrid3d.
Code:
### grid data
reset session
# create some test data
set print $Data
do for [i=1:200] {
x = rand(0)*100-50
y = rand(0)*100-50
z = sin(x/15)*sin(y/15)
print sprintf("%g %g %g",x,y,z)
}
set print
set view equal xyz
set view map
set multiplot layout 1,2
set title "Original data with no regular grid"
unset dgrid3d
splot $Data u 1:2:3 w p pt 7 lc palette notitle
set title "Gridded data"
set dgrid3d 100,100 qnorm 2
splot $Data u 1:2:3 w pm3d
unset multiplot
### end of code
Result:
If you have the size of each cell, you can use the "boxxyerror" plotting style. Let xdelta and ydelta be half the size of a cell along the x-axis and y-axis.
Script:
$datablock <<EOD
# x y xdelta ydelta pressure
1 1 1 1 0
3 1 1 1 1
1 3 1 1 1
3 3 1 1 3
2 6 2 2 4
6 2 2 2 4
6 6 2 2 5
4 12 4 4 6
12 4 4 4 6
12 12 4 4 7
EOD
set xrange [-2:18]
set yrange [-2:18]
set palette maxcolors 14
set style fill solid 1 border lc black
plot $datablock using 1:2:3:4:5 with boxxyerror fc palette title "mesh", \
$datablock using 1:2 with points pt 7 lc rgb "gray30" title "point"
pause -1
In this script, 5-column data (x, y, xdelta, ydelta, pressure) is given for "boxxyerror" plot. To colorize the cells, the option "fc palette" is required.
Result:
I hope this figure is what you are looking for.
Thanks.
I would like to draw a line with plots that contain "jumping" values.
Here is an example: when we have plots of sin(x) for several cycles and plot it, unrealistic line will appear that go across from right to left (as shown in following figure).
One idea to avoid this might be using with linespoints (link), but I want to draw it without revising the original data file.
Do we have simple and robust solution for this problem?
Assuming that you are plotting a function, that is, for each x value there exists one and only one corresponding y value, the easiest way to achieve what you want is to use the smooth unique option. This smoothing routine will make the data monotonic in x, then plot it. When several y values exist for the same x value, the average will be used.
Example:
Data file:
0.5 0.5
1.0 1.5
1.5 0.5
0.5 0.5
Plotting without smoothing:
set xrange [0:2]
set yrange [0:2]
plot "data" w l
With smoothing:
plot "data" smooth unique
Edit: points are lost if this solution is used, so I suggest to improve my answer.
Here can be applied "conditional plotting". Suppose we have a file like this:
1 2
2 5
3 3
1 2
2 5
3 3
i.e. there is a backline between 3rd and 4th point.
plot "tmp.dat" u 1:2
Find minimum x value:
stats "tmp.dat" u 1:2
prev=STATS_min_x
Or find first x value:
prev=system("awk 'FNR == 1 {print $1}' tmp.dat")
Plot the line if current x value is greater than previous, or don't plot if it's less:
plot "tmp.dat" u ($0==0? prev:($1>prev? $1:1/0), prev=$1):2 w l
OK, it's not impossible, but the following is a ghastly hack. I really advise you add an empty line in your dataset at the breaks.
$dat << EOD
1 1
2 2
3 3
1 5
2 6
3 7
1 8
2 9
3 10
EOD
plot for [i=0:3] $dat us \
($0==0?j=0:j=j,llx=lx,lx=$1,llx>lx?j=j+1:j=j,i==j?$1:NaN):2 w lp notit
This plots your dataset three times (acually four, there is a small error in there. I guess i have to initialise all variables), counts how often the abscissa values "jump", and only plots datapoints if this counter j is equal to the plot counter i.
Check the help on the serial evaluation operator "a, b" and the ternary operator "a?b:c"
If you have data in a repetitive x-range where the corresponding y-values do not change, then #Miguel's smooth unique solution is certainly the easiest.
In a more general case, what if the x-range is repetitive but y-values are changing, e.g. like a noisy sin(x)?
Then compare two consecutive x-values x0 and x1, if x0>x1 then you have a "jump" and make the linecolor fully transparent, i.e. invisible, e.g. 0xff123456 (scheme 0xaarrggbb, check help colorspec). The same "trick" can be used when you want to interrupt a dataline which has a certain forward "jump" (see https://stackoverflow.com/a/72535613/7295599).
Minimal solution:
plot x1=NaN $Data u 1:2:(x0=x1,x1=$1,x0>x1?0xff123456:0x0000ff) w l lc rgb var
Script:
### plot "folded" data without connecting lines
reset session
# create some test data
set table $Data
plot [0:2*pi] for [i=1:4] '+' u 1:(sin(x)+rand(0)*0.5) w table
unset table
set xrange[0:2*pi]
set key noautotitle
set multiplot layout 1,2
plot $Data u 1:2 w l lc "red" ti "data as is"
plot x1=NaN $Data u 1:2:(x0=x1,x1=$1,x0>x1?0xff123456:0x0000ff) \
w l lc rgb var ti "\n\n\"Jumps\" removed\nwithout changing\ninput data"
unset multiplot
### end of script
Result:
If I set a specific yrange and plot in a pdf terminal with this plot command:
plot "data.dat" u 1:4:5:6 w yerrorbars pt 6 ps 0.5 t "R_t"
errorbars that belong to data points outside the yrange, but end inside the yrange are not shown.
How do I force gnuplot to draw those. I already tried "set clip one/two"
The only workaround I found is to plot the data 3 times, once for the central point and once for each side of the error bar.
Use "-" as symbol for the errorbars and use their own "errorbars" to draw a line to the central point.
You could use multiplot to achieve this.
Set your plot to have zero margins, so the axes are on the border of the canvas, and switch of all tics and borders for the first plot.
Switch on the axes, tics etc. again, and do an empty plot that you set at the correct position using set size and set origin. You'll have to do some math to calculate the exact position.
#MaVo159, you can reduce it to plotting only twice by using with yerrorbars and with vectors (check help vectors). You need to set the proper arrow style, check help arrowstyle.
However, this works only for gnuplot>=5.2.3, for earlier versions there seems to be a bug which plots the arrowhead at the wrong side for some of the vectors extending the graph.
You nevertheless have to plot once with yerrorbars in order to get the proper legend.
Script: (works for gnuplot>=5.2.3, May 2018)
### plot errorbars from points outside the range
reset
$Data <<EOD
1 9 5.11 8.32
2 8 6.20 9.22
3 6 5.31 6.31
4 5 4.41 5.51
5 4 3.31 4.71
6 2.9 2.81 3.71
7 2 1.11 3.41
EOD
set yrange[3:7]
set offsets 1,1,0,0
set style arrow 1 heads size 0.05,90 lw 2 lc 1
set multiplot layout 2,1
plot $Data u 1:2:3:4 w yerrorbars pt 6 ps 2 lw 2
plot $Data u 1:2:3:4 w yerrorbars pt 6 ps 2 lw 2, \
'' u 1:3:(0):($4-$3) w vec as 1 notitle
unset multiplot
### end of script
Result:
You could modify your data file: Because the central value of the data point is outside the plot range you could set it equal to the errorbar's end point that would be still visible in your plot.
Example:
plot range: set yrange[-2:2]
data point: 1, -3, -1, -4 (x, y, ylow, yhigh)
set data point to: 1, -1, -1, -4
Attention: Since you have to edit your data file you should
Make a copy of the original data file
Be very careful when editing the file
Keep in mind, that when changing the plot range such that the central
value of the data point becomes visible you have to use the original data point. Otherwise you will see the correct error bar but there will be no central value plotted. (this is equivalent to setting 'point type' to 0)
I have data for a CDF in a file which looks like the following:
0.033 0.0010718113612
0.034 0.0016077170418
0.038 0.0021436227224
... ...
... ...
0.847 0.999464094319
0.862 1.0
First column is the X-axis value and the second column is the CDF value on Y-axis. I set the line style as follows:
set style line 1 lc rgb 'blue' lt 1 lw 2 pt 7 ps 0.75 # --- blue
and subsequently plot the line with the following:
plot file1 using 1:2 title 'Test Line CDF' with linespoints ls 1
This all works fine, the problem seems to be that my CDF file is pretty big (about 250 rows) and Gnuplot would plot the marker/point (a circle in this case) for every data point. This results in a very "dense" line because of the over-concentration of markers such that the underlying line is almost not visible as I show in an example image below:
How can I selectively draw the markers so that instead of having them on all data points, I plot them after every 50 data points, without having to decrease the number of data points (which I believe is what "every n" in the plot command would do) in my data file or decrease the marker size?
There is no need to use two plots commands, just use the pointinterval option:
plot 'data' pointinterval 5 with linespoints
That plots every line segment, but only every fifth point symbol.
The big advantage is, that you can control the behaviour with set style line:
set style line 1 lc rgb 'blue' lt 1 lw 2 pt 7 ps 0.75 pi 5
plot 'data' w lp ls 1
You can plot the same function twice, once with lines only, and then with points every n points. This will draw less points without decreasing the amount of segments. I think this is what you want to achieve. For this example I have done set table "data" ; plot sin(x) to generate numerical sampling of the sin(x) function.
What you have at the moment is:
plot "data" with linespoints pt 7
which gives
Now you can do the following:
plot "data" with lines, "data" every 10 with points pt 7 lc 1
which gives what you want:
You can change the styling to meet your needs.
Although #Miguel beat me to it, but I'm also posting my solution below:
The idea is to once draw the line and then draw the points with the "every n" specifier. I changed my own Gnuplot script in the following manner. A kind of hack but works:
set style line 1 lc rgb 'blue' lt 1 lw 2 pt 7 ps 0 # --- blue
plot file1 using 1:2 title '' with linespoints ls 1, "" using 1:2 every 20 title 'Test Line CDF' with points ls 1 ps 0.75
This retains the nice curve, without quantizing it too coarsely while also keeping the points much better spaced.
After the answer got in my earlier post drawing vertical lines in between bezier curves, I have been trying to label the segments separated by the dotted lines. I used x2label but found out that if I use it multiple times then the data gets replaced though they are positioned in different places. Below is the script:
set term x11 persist
set title "Animation curves"
set xlabel "Time (secs.)"
set ylabel "Parameter"
set x2label "Phoneme1" offset -35
set pointsize 2
set key off
set style line 2 lt 0 lc 1 lw 2
plot [0.04:0.15] "curve.dat" u 1:2 smooth csplines ls 1, "" u 1:($2-0.2):(0):(0.3) w vectors nohead ls 2, \
"curve.dat" u 1:2 with points
The output is the following.
I want to label Phoneme1, Phoneme2...and so on.. on top of each segment. How would I do it? Also as I was suggested in my earlier post to play with the line "" u 1:($2-0.2):(0):(0.3) w vectors nohead ls 2 to get a top to bottom vertical lines. But that also did not work. How do I get the lines from top margin to bottom? Thank you.
The horizontal lines
The horizontal lines can be accomplished with setting the yrange to an explicit value. Otherwise gnuplot would try to get some space between the lines and the axis. You could choose the values
set yrange [0.3:1.2]
Then you simply modify the vector using directions like so:
"" u 1:(0.3):(0):(1.2) w vectors nohead ls 2
(see below for the complete script)
The labeling of the sections
A quick way of doing this with your set of data would be this:
set key off
set style line 2 lt 0 lc 1 lw 2
set yrange [0.3:1.2]
plot [0.04:0.15] "Data.csv" u 1:2 smooth csplines ls 1, \
"" u 1:(0.3):(0):(1.2) w vectors nohead ls 2, \
"" u ($1+0.005):(1):(sprintf("P %d", $0)) w labels
However, this will probably not look the way you want it to look. You could think of modifying your data file to also include some information about the labeling like:
#x-value y-value x-label y-label label
0.06 0.694821399177 0.65 0.1 Phoneme1
0.07 0.543022222222 0.75 0.1 Phoneme2
Then the labels line would simply look like:
"" u 3:4:5 w labels
The complete plot then looks like this: