[ros-users] cvMat -> ros message

Dan Lazewatsky lazewatskyd at cse.wustl.edu
Fri Apr 23 00:52:08 UTC 2010

Hi all -
I have a cvMat that I'm trying to send out in a ROS message, but I'm 
having some issues getting it to work right.

My message definition is: float64[9] mat
I'm loading data into the message as follows:
myMessage h_m;
for(int j=0; j<3;++j){
     for(int k=0; k<3; ++k){
         h_m.mat[j+k*3] = cvmGet(&_h, j, k);

No errors here, but when I look at the data from a subscriber (or using 
rostopic echo), but numbers are wrong. Numbers that should be in the 
range of 0-10 end up in 10^6-10^-5. I've tried creating a 
std_msgs::Float64 and casting to a Float64 first, neither of which 
worked. I'm at a bit of a loss as to what's going on. Any help would be 


More information about the ros-users mailing list