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Octave from Java
by xolotl
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What is considered the best solution for calling Octave from Java
(_not_ the other way round) nowadays? I am aware of joPAS. Thanks, -- O.L. _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Muthiah Annamalai-3
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Just use pipes must work isnt it?
Look at the recent popen2 thread that allows calling Octave from Python. Michael Giffoul contributed some insight into this process, and you just have to convert his m-file code into Java. -Muthu On Dec 26, 2007 9:12 PM, Olivier Lefevre <lefevrol@...> wrote: > What is considered the best solution for calling Octave from Java > (_not_ the other way round) nowadays? I am aware of joPAS. > > Thanks, > > -- O.L. > > _______________________________________________ > Help-octave mailing list > Help-octave@... > https://www.cae.wisc.edu/mailman/listinfo/help-octave > Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Michael Goffioul-2
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On 12/27/07, Muthiah Annamalai <muthuspost@...> wrote:
> Just use pipes must work isnt it? > Look at the recent popen2 thread > that allows calling Octave from Python. > > Michael Giffoul contributed some insight into this process, > and you just have to convert his m-file code > into Java. The java package that is available from octave-forge provides some Octave access from Java, provided that the initial proces is octave (octave engine must be initialized): that is something like octave calls java, which calls octave Michael. _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by xolotl
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Michael Goffioul wrote:
> The java package that is available from octave-forge provides some > Octave access from Java Thanks. It's good to know there is something semi-official for that. -- O.L. _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by ucecesf
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On Dec 27 2007, Olivier Lefevre wrote:
> What is considered the best solution for calling Octave from Java > (_not_ the other way round) nowadays? I am aware of joPAS. > I'm not sure what the best solution is but I can say that I use the socket approach quite successfully in practice. _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Kim Hansen-5
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On Dec 27, 2007 4:12 AM, Olivier Lefevre <lefevrol@...> wrote:
> What is considered the best solution for calling Octave from Java > (_not_ the other way round) nowadays? I am aware of joPAS. We have written our own Java to Octave code, I have now had time to release it: http://launchpad.net/javaoctave Documentation only exists as JavaDoc comments, if you need more help just use the "Ask a question" feature on launchpad. -- Kim Hansen Vadgårdsvej 3, 2.tv 2860 Søborg Fastnet: 3956 2437 -- Mobil: 3091 2437 _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by xolotl
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Kim Hansen wrote:
> We have written our own Java to Octave code, I have now had time to release it: > http://launchpad.net/javaoctave Thanks! What is the architecture, though: is it a JNI-, socket- or System.exec()-based kind of interface? -- O.L. _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Kim Hansen-5
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On Thu, Feb 14, 2008 at 9:00 PM, Olivier Lefevre <lefevrol@...> wrote:
> Kim Hansen wrote: > > We have written our own Java to Octave code, I have now had time to release it: > > http://launchpad.net/javaoctave > > Thanks! What is the architecture, though: is it a JNI-, socket- > or System.exec()-based kind of interface? System.exec() and it transfers values by using "save -text -" and "load -text -" -- Kim Hansen Vadgårdsvej 3, 2.tv 2860 Søborg Fastnet: 3956 2437 -- Mobil: 3091 2437 _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by xolotl
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There was already a System.exec()-based Java bridge: joPAS.
Did you find problems with it? Not attacking your solution, just a question. Regards, -- O.L. _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Kim Hansen-5
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On Fri, Feb 15, 2008 at 4:51 AM, Olivier Lefevre <lefevrol@...> wrote:
> There was already a System.exec()-based Java bridge: joPAS. > Did you find problems with it? Not attacking your solution, > just a question. I looked at joPAS, but they used a global queue for communicating with octave, that meant that it was impossible to run two different octave processes from the same Java program, that was a feature I needed. -- Kim Hansen Vadgårdsvej 3, 2.tv 2860 Søborg Fastnet: 3956 2437 -- Mobil: 3091 2437 _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Eric S Fraga
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At Fri, 15 Feb 2008 00:27:17 +0100, Kim Hansen wrote:
> > System.exec() and it transfers values by using "save -text -" and "load -text -" > Have you done any comparisons with socket based (listen) approaches? I am particularly interested in the impact of Octave start-up time and file i/o for save and loads. I have a application specific interface based on listen which works well but does suffer from latency (I tend to make thousands of calls to Octave in a typical run). cheers, eric _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Kim Hansen-5
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On Feb 15, 2008 8:00 PM, Eric S Fraga <e.fraga@...> wrote:
> At Fri, 15 Feb 2008 00:27:17 +0100, Kim Hansen wrote: > > > > System.exec() and it transfers values by using "save -text -" and "load -text -" > > > > Have you done any comparisons with socket based (listen) approaches? I > am particularly interested in the impact of Octave start-up time and > file i/o for save and loads. I have a application specific interface > based on listen which works well but does suffer from latency (I tend > to make thousands of calls to Octave in a typical run). I have not researched any other way to communicate with octave, as we haven't had any need for it. Our application uses some seconds for feeding data into octave, then calls some octave scripts that works on the data for 10 minutes to an hour, and then we read the result back within seconds. -- Kim Hansen Vadgårdsvej 3, 2.tv 2860 Søborg Fastnet: 3956 2437 -- Mobil: 3091 2437 _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Andrea Grassi
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Hello Kim, I'm a student who's making a java program that interface itselfs with octave as part of a thesis. I successful made my own java code to call octave and execute commands. But I am facing a problem and I'd like to know if you have successfully solved this problem (if not I'll make a general question in a separate post :) ) : If I pass a wrong command to octave, it crash (apparently). Let me use your lib as an example (it seems it is affected, but I don't know if we can avoid it) if I write : Octave o = new Octave(); o.execute("A=5"); o.execute("disp(z)"); o.execute("A=7"); After the execution of "disp(z)" it will crash, making a "Broken pipe" exception right in the next command. Do you also have this problem? If you faced it, how did you solve it? Thank you. Andrea Grassi |
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Re: Octave from Java
by Kim Hansen-5
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On Thu, Feb 28, 2008 at 10:37 PM, Andrea Grassi <andrea.sdl@...> wrote:
> > Hello Kim, > I'm a student who's making a java program that interface itselfs with octave > as part of a thesis. I successful made my own java code to call octave and > execute commands. But I am facing a problem and I'd like to know if you have > successfully solved this problem (if not I'll make a general question in a > separate post :) ) : If I pass a wrong command to octave, it crash > (apparently). > Let me use your lib as an example (it seems it is affected, but I don't know > if we can avoid it) > if I write : > Octave o = new Octave(); > o.execute("A=5"); > o.execute("disp(z)"); > o.execute("A=7"); > After the execution of "disp(z)" it will crash, making a "Broken pipe" > exception right in the next command. > Do you also have this problem? If you faced it, how did you solve it? I have not done anything to avoid that problem, our solution gets the exact same "Broken pipe" error. -- Kim Hansen Vadgårdsvej 3, 2.tv 2860 Søborg Fastnet: 3956 2437 -- Mobil: 3091 2437 _______________________________________________ Help-octave mailing list Help-octave@... https://www.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: Octave from Java
by Andrea Grassi
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Ok. Thank you anyway for your fast answer. I'll probably post a question in a separate post to see if anyone has solved this. The problem probably lies in how java streams interacts with octave process, but I can't seem to find any log that can explain to me what's happening. Greetings, Andrea Grassi |
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Re: Octave from Java
by Andrea Grassi
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(answering myself..) To those interested I've solved the above problem (even thought I don't know what was causing it). To solve it, just use the "--interactive" switch when calling octave. This will forse the default "octave console" that doesn't have this problem. If you used a BuffereReader (with readline) to read data beware that it will probably won't work well with this switch. Better read bytes. Hope this will help someone :) Andrea Grassi |
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