Date: 2018apr15
Product: gnuplot
Q. gnuplot: make a simple line graph
A. Install gnuplot with your distro's package manager
dnf install gnuplot
(On RedHat/Fedora/CentOS)
Gather your data into a text file of x,y pairs.
water_level.data
2001 132
2002 141
2003 144
2004 143
2005 126
2006 133
2007 358
2008 350
2009 357
2010 371
2011 375
2012 361
2013 384
2014 387
2015 400
2016 410
2017 417
Make a .gp file.
water_level.gp
set terminal pngcairo size 800,800 enhanced font 'Verdana,10';
set output 'water_level.png';
set title 'Water Levels;
set xlabel 'Year';
set ylabel 'Centimetres';
plot 'water_level.data' with lines lw 2 title '';
print 'Done';
Run it:
gnuplot water_level.gp
Look at water_level.png
