Use the message passing technique to simulate a random walk of n objects on a "periodic" or "circular" integer lattice. The rules are described as the following: 1. The lattice can be discretized as N grid points with a location at 1, 2, ..., N.
2. Initially, the n objects can be placed anywhere randomly in the lattice. One or more objects can occupy the same grid point at any given time.
3. Each object must flip a coin before moving a step: Move 1 step to the right (Head) or Move 1 step to the left (Tail).
4. If an object located at grid point N moves 1 step to the right, it should land in grid point 1. If an object located at grid point 1 moves 1 step to the left, it should land in grid point N.
The lattice should be distributed into np partitions where np is the number of workers (cpus/cores). For example, for the case where N=10 and np=2, worker 1 is taking care of grid 1, ..., 5, and worker 2 is taking care of grid 6, ..., 10.
Utilize the commands labSend, labProbe, labReceive, and labBarrier to deal with objects crossing partitions. Stop the simulation when all objects achieve M steps. Plot the initial and final positions of all objects.

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a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.