Interesting article. Thanks for bringing it to our attention, Joe.
There are a couple of quotes that I like, such as "It's simply amazing
the things that you can learn when data is presented in a graphical
format."
It appears that the author is using <<- when he only needs <- in one function definition. There isn't anything peculiar about PL/R that would require <<-, is there?
No, nothing at all.
The only time you might need <<- (and I'm admittedly no expert on R, so this may be inappropriate use), is when you want to create a variable in one PL/R function, and then access it from another PL/R function. For instance, when you want to prepare a query, and then execute it multiple times. By preparing the query, you save the time of parsing and planning each time you execute it. There is an example here (see pg.spi.execp):
http://www.joeconway.com/plr/doc/plr-spi-rsupport-funcs.html
In Robert's example he's calling pg.spi.exec directly, so there is no need for <<-.
Thanks for the comments!
Joe
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