The good thing about sharing your knowledge with people is that you always find yourself strangely inspired. That’s what happened to me the other day in a meeting with colleagues where we were looking at some issues we were having with a reporting format we created in R Markdown. I was trying to explain to them, in simple terms, the little I knew about how R’s search path works and how it accesses objects along that path. I typed search()
and got this all too familiar output
[1] ".GlobalEnv" "package:stats" [3] "package:graphics" "package:grDevices" [5] "package:utils" "package:datasets" [7] "package:methods" "Autoloads" [9] "package:base" >
Because of the size of my console window that day, I suddenly had an analogy for them.
I asked them to imagine that they were sitting at a desk with two drawers and suddenly started looking for a particular document. What would they do?
![A desk with drawers and a chair](https://adventureswithr.wordpress.com/wp-content/uploads/2017/09/jubilee_campus_mmb_c2ab35_melton_hall.jpg?w=300&h=183)
The first impulse would be to start from the tabletop. This represents .GlovalEnv
, otherwise known as the Workspace. If not found, one would look through the drawers on one side, one after the other – beginning from the top – and if still not found, one moves over to the other side, also starting from the top drawer.
This is exactly how R uses its search path. The last visible ‘drawer’ that it checks is the base environment, which is accessible with baseenv()
.
Reblogged this on #OdinWallace.
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Reblogged this on The Opportunist.
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