Create a bar graph using gnuplot and save it as an image file. The goal is to create the graph below.
You can easily install it on your Mac using Homebrew.
$brew install gnuplot
Create a bar graph
Prepare the data h4>
I saved it with the file name sample-box.dat.
1 "2016" 9500 2 "2017" 10800 3 "2018" 11800 4 "2019" 12100 5 "2020" 16600
Start gnuplot and display the graph.
If sample-box.dat is not in the current directory, specify the file path.
$ gnuplot G N U P L O T Version 5.4 patchlevel 0 last modified 2020-07-13 Copyright (C) 1986-1993, 1998, 2004, 2007-2020 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> gnuplot> plot 'sample-box.dat' using 1:3:xtic(2) with boxes gnuplot>
Did you see a bar chart?
I think that the x-axis is displayed from "2016" to "2020", and the y-axis is the value in the third column of sample-box.dat to create a bar graph.
Save as an image
Specify the output destination with set terminal and set output and plot.
gnuplot> set terminal png font "Sans,9" Terminal type is now 'png' Options are 'nocrop enhanced size 640,480 font "Sans,9.0" ' gnuplot> set output 'test-boxes.png' gnuplot> gnuplot> plot 'sample-box.dat' using 1:3:xtic(2) with boxes gnuplot>
Was the graph saved as a test-boxes.png file?
Select a font that can display Japanese in your environment.
Simplify the output of bar graphs
Save the following file as png_plot-boxes.txt.
I also tried to specify the format of the graph.
set terminal png font "Sans,9" set output 'test-boxes.png' set boxwidth 0.5 set style fill solid unset key set title 'year sell' set ylabel '(yen)' set format "%'.0f" set decimalsign locale; set decimalsign "." plot [0:] 'sample-box.dat' using 1:3:xtic(2) with boxes</pre> You can execute the commands in the file all at once by executing the following. <pre> $gnuplot png_plot-boxes.txt
You can get the same result by starting gnuplot and using the load command.
The following image is saved.