zxy=@(c,xy)exp(-((xy(:,1)-c(1)).^2+(xy(:,2)-c(2)).^2)/2/c(3)^2);

This is a MATLAB anonymous function that takes two inputs: a vector c with three elements and a matrix xy with two columns representing x and y coordinates. The function returns a matrix with the same number of rows as xy, where each element is computed using the formula exp(-((xy(:,1)-c(1)).^2 (xy(:,2)-c(2)).^2)/2/c(3)^2).

This function can be used to compute a Gaussian kernel centered at a point specified by the vector c, where the standard deviation of the kernel is given by c(3). The input matrix xy represents the coordinates of the points where the kernel is evaluated.

相关问题

root@zxy-virtual-machine:/home/zxy/myFabric# make cryptogen Command 'make' not found, but can be installed with: apt install make # version 4.3-4.1build1, or apt install make-guile # version 4.3-4.1build1 root@zxy-virtual-machine:/home/zxy/myFabric# make cryptogen Command 'make' not found, but can be installed with: apt install make # version 4.3-4.1build1, or apt install make-guile # version 4.3-4.1build1

It seems that the 'make' command is not found on your system. The 'make' command is usually used to compile and build software from source code. To resolve this issue, you can try installing 'make' using the following command:

sudo apt install make

After the installation is complete, you should be able to run the 'make' command successfully.

[ERROR] [1685008813.764906491]: Cannot identify '/dev/video0': 2, No such file or directory [usb_cam-2] process has died [pid 3201, exit code 1, cmd /opt/ros/melodic/lib/usb_cam/usb_cam_node __name:=usb_cam __log:=/home/zxy/.ros/log/f0ecf8e8-fae2-11ed-96ca-000c298795f5/usb_cam-2.log]. log file: /home/zxy/.ros/log/f0ecf8e8-fae2-11ed-96ca-000c298795f5/usb_cam-2*.log

这个错误提示是在ROS机器人操作系统中使用USB摄像头时出现的。错误提示是找不到/dev/video0这个文件，这可能是因为你的电脑中没有连接摄像头，或者是连接的摄像头没有被正确识别。你可以尝试重新连接摄像头，或者检查一下摄像头是否被正确识别。如果问题仍然存在，你可以尝试在终端中运行以下命令来查看摄像头是否被正确识别：

ls -l /dev/video*

如果摄像头被正确识别，你应该可以看到/dev/video0这个文件。如果还有其他错误信息，请查看ROS的日志文件，以获取更多信息。