Re: Postgres and GnuPlot

Well, there is this:

http://www.varlena.com/varlena/GeneralBits/Tidbits/bernier/art_66/graphingWithR.html

I thought it was overkill for me, so I went with the gnuplot method.

On Mon, 9 May 2005, Hrishikesh Deshmukh wrote:

> Hmmmm......looks like i simply can't send the query results to gnuplot
> without an intermediary!! So far my search results have not yielded
> anything....i guess intermediary is the only way to !! :(((
>
> Hrishi
>
> On 5/9/05, Ben <bench(at)silentmedia(dot)com> wrote:
> > Heh. Funny you should ask; I spent a fair amount of time yesterday
> > doing precisely this.
> >
> > Here's my gnuplot file:
> >
> > set terminal png small color picsize 1000 400
> > set style fill solid 1.0 border
> > set title "Concurrent listeners"
> > set xdata time
> > set xlabel "Time"
> > set ylabel "Cuncurrent Logged In Listeners"
> > set format x "%Y/%m/%d\n%H:%M:%S"
> > set timefmt "%s"
> > plot "< echo \"select t-7*3600,c from stats_concurrent_listener_count
> > (extract(epoch from '2004/12/13 20:00'::timestamp)::int,null);\" |
> > psql -h plur -U greenroom gr-dev -t | sed 's/|//'" using 1:2 with boxes
> >
> > cat file | gnuplot > image.png works perfectly.
> >
> > The bitch of it is that I seem to be having a hard time running this
> > as a cgi. I can't figure out. Not that this question has anything to
> > do with postgres, but maybe somebody else can tell me where I'm going
> > wrong? My CGI is:
> >
> > #!/bin/bash
> >
> > echo -e "Content-type: image/png\n\n";
> > echo -e "set terminal png small color picsize 1000 400\nset style
> > fill solid 1.0 border\nset title \"Concurrent listeners\"\nset xdata
> > time\nset xlabel \"Time\"\nset ylabel \"Cuncurrent Logged In Listeners
> > \"\nset format x \"%Y/%m/%d\\\n%H:%M:%S\"\nset timefmt \"%s\"\nplot
> > \"< echo \\\"select t-7*3600,c from stats_concurrent_listener_count
> > (extract(epoch from '2004/12/13 20:00'::timestamp)::int,null);\\\" | /
> > usr/bin/psql -h plur -U greenroom gr-dev -t | sed 's/|//'\" using 1:2
> > with boxes" | /usr/bin/gnuplot
> >
> > ...and it seems that when printing to stdout, it gives a truncated
> > version of the file. When redirecting, it does not. Maybe that's not
> > too surprising, if apache is looking for a null to see when stdout
> > stops.... but I don't know how to get around that.
> >
> >
> > On May 9, 2005, at 7:51 AM, Hrishikesh Deshmukh wrote:
> >
> > > Hi All,
> > >
> > > 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)!
> > >
> > > Thanks,
> > > Hrishi
> > >
> > > ---------------------------(end of
> > > broadcast)---------------------------
> > > TIP 4: Don't 'kill -9' the postmaster
> > >
> >
> >
>
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