> Has anybody tried using gnuplot to plot results from queries; there
> are some suggestions given in PostgreSQL Developer's Handbook but i
> have not any luck so far!
> Any pointers as how to send results from queries straight to a simple
> plotting utility (ex:gnuplot)!
I use a text file as an intermediary.
You only need to slightly modify (postgres output) and/or (gnuplot input) options:
for postgres, put something like this before the query:
\pset null '?9'
-- or other impossible beginning char to indicate missing values to gnuplot
\t
-- will show only data rows
\f '\t' -- make sure columns are tab-separated
-- don't align the output:
\a
Instead of the last two, you may change in the gnuplot script:
set datafile separator '|'
Additionally, let gnuplot know your missing columns:
set datafile missing '?'
Hope this helps.
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