[R] What does the "<<-" operator mean?

From: Cliff Clive <cliffclive_at_gmail.com>
Date: Thu, 21 Apr 2011 12:08:37 -0700 (PDT)


I've been reading some code from an example in a blog post ( http://www.maxdama.com/ here ) and I came across an operator that I hadn't seen before. The author used a <<- operator to update a variable, like so:

ecov_xy <<- ecov_xy+decay*(x[t]*y[t]-ecov_xy)

At first I thought it was a mistake and tried replacing it with the usual <- assignment operator, but I didn't get the same results. So what does the double arrow <<- operator do?

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Received on Thu 21 Apr 2011 - 19:52:23 GMT

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