Eric Wang comments

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                                            Eric Wang

提高刷题幸福感的小技巧 :: labuladong的算法小抄

NB了

Where is matrix B which relates the optional control input to the state x?

Yeah, we need B

Stuck on `Trying to initialize`.

It's useful when distance is large

But the last step has issues,

refer to this, solve it for ROS catkin build on Ubuntu 16.04, thanks.

Cannot create a KDTree with an empty input cloud!

just change ```cpp kdtreeNonFeatureFromLocal->setInputCloud(laserCloudNonFeatureFromLocal); ``` to ```cpp if(!laserCloudNonFeatureFromLocal->empty()) kdtreeNonFeatureFromLocal->setInputCloud(laserCloudNonFeatureFromLocal); ```

Cannot create a KDTree with an empty input cloud!

you can add log to all the setInputCloud used, then use if(!cloud->empty()) to avoid the ERROR

Cannot create a KDTree with an empty input cloud!

Not yet

How to change the view angle for quadcopter in jMAVSim

I also want to know

Too many build warnings

also this ``` hal_usb_bulk.c:106:13: note: ‘snprintf’ output between 5 and 68 bytes into a destination of size 64 snprintf(usbBulk2EpOutFd, sizeof(usbBulk2EpOutFd), "%s/ep1", ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ linkConfig.usbBulkConfig.usbBulk2DeviceName); ```