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2013-03-10 07:53:59 -0500 commented question Error in scan matching. ICP failed for some reason.

did you find any solution to this ?

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2012-12-26 06:36:42 -0500 commented question Sick S3000 configuration

A little bit late to reply , but Have you tried this package ?? http://code.google.com/p/sick-s3000-ros-pkg/ I have got the data from the s3000 using this package.

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2012-05-05 05:52:45 -0500 asked a question Matlab IPC_bridge Custom datatype (Array) communication

Has anybody written a working script of IPC_bridge to get the simple array data from Matlab in ROS ?

I have tried to write it (following the format of poseArray in geometry_msgs) but its not working, Matlab gives the " Segmentation violation" error when I try to transmit array.

While if i just transmit length of Array (integer), and not set the array itself, Matlab doesn't give error, but checking the communication by rostopic, I see the array comes blank, I have even tried to assign dummy values to array in script (ros/xxx_subscriber.cc), still the transmitted array comes empty. If anyone has tried this then please help..

2012-05-05 05:33:40 -0500 commented question Matlab Engine and ROS Library Incompatible?

I think you are using ipc bridge to connect if I am not wrong. I posted the solution to this problem in your previous question http://answers.ros.org/question/33279/matlab-ros-communication-with-ipc_bridge_ros . do check it.

2012-05-05 05:30:23 -0500 answered a question Matlab-ROS Communication with ipc_bridge_ros

I just went through same problem recently, the solution is pretty long.

  1. you have to install older version of GCC (4.0 or 4.1 or 4.2) in your system. I could not install it through Apt-get so had to manulay install it after downloading the setup. (I am using Ubuntu 10.04)
  2. Update in the symbolic links of Matlab ( user/.matlab/(MatlabVersion)/mexopts.sh) from "gcc" to version u installed, (eg: "gcc" to "gcc-4.1").
  3. Next problem I faced which you will also face probably. will be error in matlab while compiling "libstdc++.so.6:version GLIBCxx_3.4.9 not found". problem:ipc_bridge is expecting the above version of libstdc++, but matlab refers to the libstdc++ version which was shipped with itself. Solution:
    • check if libstdc++.so.6 is present in "usr/lib/libstdc++.so.6". If not then install the package
    • Update the "LDPATH_PREFIX" variable in file (MATLABINSTALLATIONPATH/bin/.matlab7rc.sh) for OPENGL to point to "usr/lib/libstdc++.so.6"
    • Still Matlab will try to override the pointer to its own libstdc++. So remove all c++ and g++ related files from (MatlabInstallation/sys/os/glnx86). So Matlab has no choice but to use the library you installed. (may cause a bit of unstability in matlab)

PS:Backup Every file you edit or Remove.

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2012-04-04 06:25:29 -0500 answered a question creating eclipse Project, "C/C++ Make Project" missing

Found the problem, there should be a cpp file with main function , and its "rosbuild_add_executable" in CMakeLists, in order to successfully import the project. Blank project cannot be imported.

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2012-04-04 05:52:04 -0500 asked a question creating eclipse Project, "C/C++ Make Project" missing

I followed the instructions on the following page, http://www.ros.org/wiki/IDEs . I am having problem with Step 4, there isn't any option "C/C++ Make Project" in project properties, have repeated the steps again and again but couldn't identify the problem.

2012-02-20 23:54:54 -0500 answered a question ethzasl_message_transport stack (for UDP Multicast) installation problem

Found the problem. Evidently ROS electric has some issues with class ros::Message. Its working fine in Diamondback.

2012-02-15 04:41:27 -0500 asked a question ethzasl_message_transport stack (for UDP Multicast) installation problem

I am looking to use UDP multicasting approach for communication, I found one stack with 'udpmulti_transport' package which does that.

http://www.ros.org/browse/stack.php?name=ethzasl_message_transport

I have been having problem installing this stack, have cloned it from the repository, and added the folder to Ros Package path. When I try to install it ( rosmake --rosdep-install ) I get error in the packages which seems to be c++ coding error.

pakage udpmulti_transport

  ***udpmulti_publisher.h:30: error: expected ‘;’ before ‘&’ token***

then have similar error in sharedmem_transport Is there something wrong in the stack or I am making some mistake. PS: running ROS electric

2011-12-28 01:33:55 -0500 asked a question Data Recording to simple text file

I am a newbie here, just started working on ROS a week ago. Is there any way to record /save some data into a simple text file directly from the server or client? I want to record the request received by the server, alternatively can anybody give example of this implemented by rosbag ? The basic c++ methods of fstream and ofstream do not work in ROS.