Intermediate R functions and design patterns

0.06MB. 0 audio & 1 images. Updated 2015-08-25.

Description

Useful functions from and some underlying principles behind the R programming language. For more decks, please see: http://andrewtmckenzie.com/sr/

Sample (from 51 notes)

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Front	In R, what is the function of cut(a, b, c)?
Back	creates a factor variable, where a) the first argument a is an input vector,b) the second argument b is the number of breakpoints, c) the third argument is a character vector specifying the lables > factor is aka categorical > nb, any number below the first or above the last breakpoint is coded as an NA
Tags	RINTRO

Front	In R, what is the difference between these two lm regression models? why?a) y ~ xb) y ~ 1 + x
Back	nothing; 1 corresponds to the intercept which is assumed in (a), so they are both of the form y = mx + b> trick q> http://stackoverflow.com/questions/13366755/what-does-the-r-formula-y1-mean
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Front	In R, how do you reverse a string x?
Back	via rev(x)
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