Re: Fast plotting?
[EMAIL PROTECTED] <[EMAIL PROTECTED]> typed: > Are you sure about these numbers? Most monitors refresh at 70-80Hz, > so unless you have special display hardware, I'm suspicious of these > numbers doubt . I once had a user post to the matplotlib mailing list > that xplt was refreshing at 1000 Hz. I think xplt drops plot requests > while requests are in the queue, so many of the loops in his iteration > were simply dropped. If the plotting library puts draw requests in an > idle event handler, accurate refresh rate numbers can be hard to > quantify. > > JDH dislin doesn't seem to do that. I varied the number of points in the plot so the drawing rate went from from 60 Hz to 144 Hz. It scaled linearly above and below my 85 Hz screen rate. It wouldn't do that if it were dropping plots. I think that computers are so fast that they can draw to the frame buffer very quickly, but the slower screen refresh means only some of those fully drawn frames make it to the monitor. Even if you are correct, that is still drawing at 85 Hz and thus much faster than the original poster needed. -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast plotting?
Are you sure about these numbers? Most monitors refresh at 70-80Hz, so unless you have special display hardware, I'm suspicious of these numbers doubt . I once had a user post to the matplotlib mailing list that xplt was refreshing at 1000 Hz. I think xplt drops plot requests while requests are in the queue, so many of the loops in his iteration were simply dropped. If the plotting library puts draw requests in an idle event handler, accurate refresh rate numbers can be hard to quantify. JDH -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast plotting?
William Park <[EMAIL PROTECTED]> typed: > Russell E. Owen <[EMAIL PROTECTED]> wrote: >> Can anyone recommend a fast cross-platform plotting package for 2-D >> plots? >> >> Our situation: >> We are driving an instrument that outputs data at 20Hz. Control is >> via an existing Tkinter application (which is being extended for >> this new instrument) that runs on unix, mac and windows. We wish to >> update 5-10 summary plots at approximately 2 Hz and will be offering >> controls to control the instrument and the plots, preferably (but >> not necessarily) mixed in with the plots. > > That's 10-20 plots per second. The only GUI plotter that I know is > 'gnuplot', and I don't know if it will spit out anything at 10-20Hz. > For character plots (like old days terminal), it has speed but ugly to > look at. > >> >> Ideally the package would create plots in the Tkinter application. >> But we realize we're unlikely to get the speed we need that way. So >> we are willing to have the Tkinter app send data to the plotting >> package (e.g. via a socket) and have it display the plots in a >> separate process. >> >> We started out with matplotlib, which is a wonderful package (and >> well integrated with most or all GUI toolkits). Unfortunately it is >> just too slow -- at least when driving plots integrated with the >> Tkinter app. (It is getting faster and so are computers, so at some >> point this will be a great way to go. But for now...) >> >> Any suggestions? >> >> -- Russell disipyl is a wrapper around dislin. It includes a class that lets plots appear inside tkinter frames. I did a quick test and the first demo plot (run tkdisipyl.py) of a 180 point sine and cosine plotted at over 100 Hz. http://kim.bio.upenn.edu/~pmagwene/disipyl.html http://www.mps.mpg.de/dislin/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast plotting?
William Park <[EMAIL PROTECTED]> writes: > Russell E. Owen <[EMAIL PROTECTED]> wrote: > > Can anyone recommend a fast cross-platform plotting package for 2-D > > plots? > > > > Our situation: > > We are driving an instrument that outputs data at 20Hz. Control is via > > an existing Tkinter application (which is being extended for this new > > instrument) that runs on unix, mac and windows. We wish to update 5-10 > > summary plots at approximately 2 Hz and will be offering controls to > > control the instrument and the plots, preferably (but not necessarily) > > mixed in with the plots. > > That's 10-20 plots per second. The only GUI plotter that I know is > 'gnuplot', and I don't know if it will spit out anything at 10-20Hz. > For character plots (like old days terminal), it has speed but ugly to > look at. > HippoDraw is quite fast and scriptable from Python http://www.slac.stanford.edu/grp/ek/hippodraw -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast plotting?
Russell E. Owen <[EMAIL PROTECTED]> wrote: > Can anyone recommend a fast cross-platform plotting package for 2-D > plots? > > Our situation: > We are driving an instrument that outputs data at 20Hz. Control is via > an existing Tkinter application (which is being extended for this new > instrument) that runs on unix, mac and windows. We wish to update 5-10 > summary plots at approximately 2 Hz and will be offering controls to > control the instrument and the plots, preferably (but not necessarily) > mixed in with the plots. That's 10-20 plots per second. The only GUI plotter that I know is 'gnuplot', and I don't know if it will spit out anything at 10-20Hz. For character plots (like old days terminal), it has speed but ugly to look at. > > Ideally the package would create plots in the Tkinter application. But > we realize we're unlikely to get the speed we need that way. So we are > willing to have the Tkinter app send data to the plotting package (e.g. > via a socket) and have it display the plots in a separate process. > > We started out with matplotlib, which is a wonderful package (and well > integrated with most or all GUI toolkits). Unfortunately it is just too > slow -- at least when driving plots integrated with the Tkinter app. (It > is getting faster and so are computers, so at some point this will be a > great way to go. But for now...) > > Any suggestions? > > -- Russell -- William Park <[EMAIL PROTECTED]>, Toronto, Canada Slackware Linux -- because it works. -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast plotting?
Russell E. Owen wrote: Can anyone recommend a fast cross-platform plotting package for 2-D plots? Our situation: We are driving an instrument that outputs data at 20Hz. Control is via an existing Tkinter application (which is being extended for this new instrument) that runs on unix, mac and windows. We wish to update 5-10 summary plots at approximately 2 Hz and will be offering controls to control the instrument and the plots, preferably (but not necessarily) mixed in with the plots. Ideally the package would create plots in the Tkinter application. But we realize we're unlikely to get the speed we need that way. So we are willing to have the Tkinter app send data to the plotting package (e.g. via a socket) and have it display the plots in a separate process. We started out with matplotlib, which is a wonderful package (and well integrated with most or all GUI toolkits). Unfortunately it is just too slow -- at least when driving plots integrated with the Tkinter app. (It is getting faster and so are computers, so at some point this will be a great way to go. But for now...) Any suggestions? -- Russell Have you looked at BLT? http://sourceforge.net/projects/blt/ http://heim.ifi.uio.no/~hpl/Pmw.Blt/doc/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast plotting?
I like Ploticus. It's a bit kludgy for integration, you need to send the data to a file and have ploticus read it, but this can be easily done using memory mapped files. It's a very fast package and it produces very nice plots. SVG plots too. We use an svg viewer and then reload the svg tree to rerender the plot. -- http://mail.python.org/mailman/listinfo/python-list
