(Note: This was originally from my blog post on AlexanderRobotics.com, but I brought that site down and wanted to keep this post alive since it's referenced by Stack Overflow).
The beauty of the Arduino lies in its simplicity. A look under the covers of the Arduino and its IDE, however, reveals a fascinating chipset and an open, extensive toolchain.
| # Check what a depend [package](http://ros.org/wiki/catkin/package.xml) (build_depend, run_depend, etc.) resolves to in your system package manager. | |
| rosdep --rosdistro <release> resolve <name_of_package> | |
| # Example | |
| rosdep --rosdistro groovy resolve usb_cam # resolves to "ros-groovy-usb-cam" | |
| from tf import transformations | |
| # Docs for transformations.quaternion_from_euler | |
| # You can get docs with transformations.quaternion_from_euler? and enter | |
| #ai, aj, ak : Euler's roll, pitch and yaw angles | |
| #axes : One of 24 axis sequences as string or encoded tuple | |
| #q = quaternion_from_euler(1, 2, 3, 'ryxz') | |
| #numpy.allclose(q, [0.310622, -0.718287, 0.444435, 0.435953]) | |
| transformations.quaternion_from_euler(0, 0, -1.550) |
| # Test a package locally before publishing to NPM: | |
| # Install the package in the global space | |
| npm install . -g | |
| # Package should show up in list | |
| npm ls -g | |
| # Can view contents of the installed package with | |
| ls ~/.npm/<package name> | |
| # Publish a package to NPM | |
| # Inside the root directory of the package |
| # Sorts users by number of commits | |
| # Example output: | |
| # 85 baalexander | |
| # 59 elaw | |
| # 58 jsmartt | |
| # See https://github.com/blog/766-jeff-king-peff-is-a-githubber | |
| git log --pretty=format:%aN | sort | uniq -c | sort -rn | |
| # Alternative | |
| git shortlog -sn |