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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
Tags
Front In R, how do you reverse a string x? 
Back via rev(x) 
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