公独何人，心如止水。

前言：之前对ROS的ROS_PACKAGE_PATH一直半懂不懂，甚至对它是linux众多系统环境变量普通一员都不是很清晰今天作一下梳理。在安装ROS的时候有这么一段步骤：$ mkdir -p ~/catkin_ws/src$ cd ~/catkin_ws/src$ catkin_init_workspace$ cd ~/catkin_ws/$ catkin_make$ source de

前言：其实都在程序包的readme.md里，这里以ROS+单目为例Step1：下载ORB_SLAM2放进～/catkin_ws/src下面Step2：安装各种依赖项，github官网都写了Step3：编译ThirdParty下面的库，可以挨个进入cmake+make，也可以执行给的build.sh，具体怎么用这个文件readme.md里面给了：cd ORB_SLAM2chmod +x build.

最近要用笔记本记录下rosbag，然后传给台式机处理，无奈bag太大只好分卷压缩。1，安装rar：sudo apt-get install rar unrar2，rar a -v50000k a.rar b where a.rar为压缩后的文件，分别是a.part001.rar a.part002.rar 等 b是要压缩的文件或者文件夹名字3，解压 rar e 1.part001.rar

1，https://pan.baidu.com/s/1qYJ9tNm#list/path=%2F下载安装包，自己百度网盘里也有。2，解压后得到MATHWORKS_R2014A.iso文件3，右击该文件open with-Disk image mounter 4，进入挂载点：cd /media/kylefan/MATHWORKS_R2014A5，开始安装：sudo ./install6，选择Use a

2016/10/06 136. Single Number Given an array of integers, every element appears twice except for one. Find that single one.Your algorithm should have a linear runtime complexity. Could you implement

1,下载数据集cocodataset.org 2,download cocoapi: https://github.com/cocodataset/cocoapi 3,install and open jupyter notebook:pip install jupyterjupyter notebook #in cocoapi folder4,open pycocoDemo.ipynb

1，报错Check failed: label < num_classes (5 vs. 5) 打开train_tv_logo.prototxt搜索num_classes改为9（8classes+1）2，报错Check failed: num_priors_ * num_classes_ == bottom[1]->channels() (62136 vs. 34520) . 理解：在mult

当提示权限不允许时候尝试加个–usersudo -H pip install scikit-image --ignore-installed six --user