In gnuplot, how do you plot flattened tables that fit the form of aggregated key-value pairs? For example given this tab-delimited file, how could I plot a bar graph for type=foo, with one bar per version?
type version count
foo a 1
foo b 2
foo c 3
bar a 3
bar b 2
bar c 1
baz a 0
baz b 2
baz c 2
Extra credit: How would I plot k subplots, one for each type (e.g. foo, bar, and baz?
Use awk inside of gnuplot. First, filter the table for only 'foo' rows, then generate an x cordinate with $NF var. Pass this edited file to plot (note the quotes around the awk command) with the with boxes option:
plot "< gawk '$1 ~ /foo/ {print $NF, $2, $3 }' table.dat " using 1:3:xtic(2) with boxes
You can add multiple plots to a single diagram in gnuplot, so you could run the command above changing the filter to add "bar" and "baz" curves.
