>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 correctly
\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.
