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A* ALGORITHM BASICS FOR PATH FINDING & HEURISTICS METHODS : ARTIFICIAL INTELLIGENCE

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 A* ALGORITHM BASICS FOR PATH FINDING A* , widely used  known form of best-first search & path planning algorithm nowadays in mobile robots,games. this is the function for A*,                                     f(n) = g(n) + h(n) g ( n ) is the cost of the path from the start node to n , and h ( n ) is a heuristic function that estimates the cost of the cheapest path from n to the goal This will find cheapest f(n) value in neighbor nodes to archive goal node. check below image  A to B path finding with g(n),h(n),f(n) value In the final level check below image Now we will check the Algorithm // A* Search Algorithm 1. Initialize the open list 2. Initialize the closed list put the starting node on the open list (you can leave its f at zero) 3. while the open list is not empty a) find the node with the least f on the open list, call it "q" b) pop q off the open list c) generate q's 8 successors
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INSTALL ROS & CREATE A ROS WORKSPACE WITH SINGLE FILE IN UBUNTU

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INSTALL ROS WITH FEW LINE OF CODE IN UBUNTU


let see how to setup ros in ubuntu with few lines of code
in here I prefer ubuntu 16.04 & ros kinetic version because
you can get all the updated and working packages from ros community

Here you can do it by two ways 

1.just download ros_ubuntu_install.sh
   and make it executable through below command    
  chmod +x /path/to/ros_ubuntu_install.sh
  then  
  ./ros_ubuntu_install.sh
Thats it all the things getting complete automatically within 10-15 mints just wait..
check below demo video:



2.

otherwise copy each & every commands below and paste it into terminal

just copy below commands one by one below & paste it terminal
(you should need nice Internet connection it will take some time to complete)

sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'

sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654

sudo apt-get update

sudo apt-get install ros-kinetic-desktop-full

sudo rosdep init
rosdep update

echo "source /opt/ros/kinetic/setup.bash" >> ~/.bashrc
source ~/.bashrc
source /opt/ros/kinetic/setup.bash
sudo apt install python-rosinstall python-rosinstall-generator python-wstool build-essential


CREATE A ROS WORKSPACE

then go to home dir & open one terminal inside the home dir then do/paste below commands one by one

mkdir -p ~/catkin_ws/src
cd ~/catkin_ws/
catkin_make
source devel/setup.bash
echo $ROS_PACKAGE_PATH

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