Re: Octave/C++

[Mike Morley]

On Jul 22 2005, Søren Hauberg wrote:

> Mike Morley wrote:
> [snip]
> > The robot_link command is in the file "librobot.a" which is in the 
> > working directory. I've tried the "-l" and "-L" options for mkoctfile 
> > but can't succesfully any link the librobot.a file in. Any suggestions?
> What was the (compile time) output when you tried these flags?
> I assume you did something like this
>
> mkoctfile Bot.cpp -o BotMake.oct -lrobot
>
> right? Was librobot.a in your LD_PATH?
>
> /Søren

$mkoctfile Bot.cpp -llibrobot.a
/usr/bin/ld: cannot find -llibrobot.a
collect2: ld returned 1 exit status
$

$mkoctfile Bot.cpp -Llibrobot.a $ln -s Bot.oct BotMake.oct $octave -q 
1>BotMake() octave: symbol lookup error: /home/mjm80/BotMake.oct: undefined 
symbol: _ZN10robot_linkC1Ev $


> > On Jul 22 2005, Søren Hauberg wrote:
> > 
> >> Hi,
> >> I haven't looked at the code you provided a link to, but here goes...
> >>  From what I understand C++ robot interface basicly consist of a 
> >> "robot_link" object that you have to provide each to you want the 
> >> robot to act. I'd say the easiest thing to do is to create a new 
> >> octave type in C++ that contains a "robot_link" and then write wrapper 
> >> functions to the functions your students need to access.
> >> A tutorial on how to write new types for Octave can be found at 
> >> http://wiki.octave.org/wiki.pl?CodaTypes
> >>
> >> Hope this helps, if not write again. Your problem should be fairly 
> >> easy to solve, although it will require a bit of work.
> >>
> >> /Søren
> >>
> >> Mike Morley wrote:
> >> > Hi,
> >> > > I see there's been some chatter about this recently, but I have 
> >> another > question for the Octave/C++ gurus.
> >> > > I'm currently working on a project that involves robotics in a > 
> >> University teaching environment.
> >> > > Students currently control the robot using a C++ program they 
> >> write > themselves and a set of commands for which they have the 
> >> header files.
> >> > > (I've put the header files and an example program that tests the 
> >> link > online at http://www.srcf.ucam.org/~mjm80/robot/)
> >> > > What we would ideally like is a higher level way of controlling 
> >> the > robot - ie, from Octave. Partly this would enable signal 
> >> processing to > become much easier and thus easily extend the range of 
> >> tasks we can > expect students to get their robots to perform.
> >> > > As I understand it, I need to create the C++ wrappers for each of 
> >> the > functions and then compile this into a .oct file in order to run 
> >> it.
> >> > > However: I'm not entirely sure how to do this - is it, for 
> >> example, > possible to have a robot_link object that persists for the 
> >> entire > Octave program? Would I be able to create a function that 
> >> mimics > rlink.command (COMMAND_NAME, var) that takes COMMAND_NAME and 
> >> var in as > arguments, or would I have to create a function for each 
> >> specific > command?
> >> > > Any help/pointers would be greatly appreciated.
> >> > > - Mike Morley
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> >>
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> > 

--
           Mike Morley -  Trinity College           
              Part IB Natural Sciences

E1 Burrell's Field | address@hidden | 07862 282608

   First & Third Trinity Boat Club May Ball 2005
address@hidden || address@hidden

   Cambridge Union Society -- External Committee






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Octave's home on the web:  http://www.octave.org
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