How to send a signal to a process in Unix

To send a signal to a process you use the kill
system call. Note that you use this system call even if you're not sending
the SIGKILL signal.

Here's an example:

        kill( chpid, SIGTERM );

R questions on Stackoverflow

I've been using the R programming language with the igraph library for a research project and had a couple of questions. Here are links to the questions on stackoverflow:

1. How do the iterators V and E in igraph using R work?
2. Does get.edgelist in R library igraph return proper directed edges?