gnuplot

问题 I have a two-column file which has 1000000 entries, that is 1000000 rows, however I don't want to plot all the data, I just want to plot the points every 100 lines? How to do this in gnuplot? Also, is it possible to specify some particular rows to plot in gnuplot? 回答1: You have at least two options here. First, check out the documentation for help datafile every plot 'datafile' every 100 using 1:2 Another option is to use the pseudo-column 0 ( help datafile using pseudo ) in conjunction with

问题 Do you know how to change the time format based on its data? I'd like to add Year info on the X axis if the date is January like this. 2013/01/01, 02/01, 03/01, ..., 11/01, 12/01, 2014/01/01, 02/21,.... I know set format command to change it. set format x "%m/%d" or set format x "%Y/%m/%d" But I don't know how to customize it. Thanks. 回答1: That is not so straightforward, because, as you said, with gnuplot you can set only a single format without any conditionals. You can solve this by setting

问题 I am using the following script to fit a function on a plot. In the output plot I would like to add a single value with etiquette on the fitting curve lets say the point f(3.25). I have read that for gnuplot is very tricky to add one single point on a plot particularly when this plot is a fitting function plot. Has someone has an idea how to add this single point on the existing plot? set xlabel "1000/T (K^-^1)" font "Helvetica,20" #set ylabel "-log(tau_c)" font "Helvetica,20" set ylabel "

问题 I am using the following script to fit a function on a plot. In the output plot I would like to add a single value with etiquette on the fitting curve lets say the point f(3.25). I have read that for gnuplot is very tricky to add one single point on a plot particularly when this plot is a fitting function plot. Has someone has an idea how to add this single point on the existing plot? set xlabel "1000/T (K^-^1)" font "Helvetica,20" #set ylabel "-log(tau_c)" font "Helvetica,20" set ylabel "

问题 I have several files called data_x.dat , where x ranges from 1 to 10 . I'm looking for something in gnuplot that would allow me to directly plot the second column agains the first one of all of the files in the same graph, instead of doing p "data_1.dat" u 1:2, "data_2.dat" u 1:2, ..., "data_10.dat" u 1:2 which is slow to type. Something like: p "data_*" u 1:2 is what I'm looking for. Does it exist for gnuplot?. Thank you. 回答1: Use inline iterations: plot for [i=1:10] sprintf("data_%d.dat", i

问题 I have a long file like the following (I am just writing a sample) 0.0 0.00209627946771 6483.0 3092622.0 1100 0.1 0.00253798848144 78.0 30733.0 1100 0.2 0.0174927113703 6.0 343.0 1100 0.3 0.0 0.0 35.0 1100 0.4 0.1 1.0 10.0 1100 0.5 0.0 0.0 4.0 1100 0.9 0.0 0.0 1.0 1100 1.0 0.0 0.0 2.0 1100 0.0 0.00292927058349 9057.0 3091896.0 2100 0.1 0.00299136583044 88.0 29418.0 2100 0.2 0.00743889479277 14.0 1882.0 2100 0.3 0.00578034682081 2.0 346.0 2100 0.4 0.0172413793103 2.0 116.0 2100 0.5 0

问题 Can somebody explain why the second curve is not just the expected line from 0,0 to 1,1 , but a line from 0,0 to 2*pi,2*pi ? Why is the second range [t=0:1] ignored? Bug or feature or did I miss anything in the manual? Code: ### parametric curves reset session set parametric set size square plot [0:2*pi] cos(t), sin(t) w l, \ [t=0:1] t, t w l ### end of code Result: 回答1: The use of axis ranges at the start of a plot command is a historical artifact. It confuses the program as well as the user

问题 I'm having trouble running gnuplot 5.2 on my desktop (Ubuntu 18.04). I get the following error: $ gnuplot G N U P L O T Version 5.2 patchlevel 2 last modified 2017-11-01 Copyright (C) 1986-1993, 1998, 2004, 2007-2017 Thomas Williams, Colin Kelley and many others gnuplot home: http://www.gnuplot.info faq, bugs, etc: type "help FAQ" immediate help: type "help" (plot window: hit 'h') Terminal type is now 'qt' gnuplot> test /usr/lib/gnuplot/gnuplot_qt: symbol lookup error: /usr/lib/x86_64-linux

问题 I have a data file with 100 columns and thousands of rows, but I want to be able to select one single row, and in that row, use the even columns as the inputs for the X-axis and the odd columns as inputs for the Y-axis for a plot. Is there any way I can do that in gnuplot? 回答1: So here the script I've done to plot a given line from a given data file with odd column as x-axis and even column as y-axis. #!/usr/bin/gnuplot set term pdf set output "plot.pdf" line_number=1 data_file="data.dat" set

问题 I need to plot a single point, from a line in data file, that has many other lines and two rows. I don't know how to select a single line in gnuplot, not the entire file of data. Any suggestions please??? 回答1: You have to filter out. In gnuplot this is done with the keyword every . Since you do not provide the file you want to plot here is a possible hint based on this datafile data.dat : 10 62 11 95 12 74 13 33 14 70 youplot the point at the third line (12,74) like this: plot 'data.dat'