Add plot demo using plotutils

demos/plot.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+# erentar2002 2024
+
+# This script plots certain properties of elements on the periodic table
+
+# Dependency: gnu plotutils https://pkgs.org/search/?q=plotutils
+
+# To display the plot, use ./tek4010 demos/plot.sh
+
+# From top to bottom:
+#    - curl: download the periodic table data
+#            source: https://gist.github.com/GoodmanSciences/c2dd862cd38f21b0ad36b8f96b4bf1ee
+#
+#    - awk: split file by seperator ","
+#           then filter missing values in column 20 (density)
+#           then filter up to element 105
+#           then print atomic mass and density
+#
+#    - sed: remove the top row which includes names
+#
+#    - graph: -X x axis title;
+#             -Y y axis title;
+#             -F font;
+#             -m line type;
+#             -S symbol type and size;
+#             -w width;
+#             -r move horizontally
+#
+#    - plot: -T use tek device
+curl 'https://gist.githubusercontent.com/GoodmanSciences/c2dd862cd38f21b0ad36b8f96b4bf1ee/raw/1d92663004489a5b6926e944c1b3d9ec5c40900e/Periodic%2520Table%2520of%2520Elements.csv' \
+| awk '{split($0,a,","); if(length(a[20])!=0&&a[4]<105){print a[4],a[20]}}' | \
+sed 1d \
+| graph -X "atomic mass" -Y "density" -F "HersheySans" -m 1 -S 2 0.03 -w 1 -r 0 \
+| plot -T tek
+
+# On the line containing `awk`, columns are selected at the print statement.
+# This script selects the 4th and 20th columns, which are atomic mass and density respectively.
+
+# Full documentation for the `graph` utility is available at https://www.gnu.org/software/plotutils/manual/en/plotutils.pdf