Cheatography

# r part1 Cheat Sheet (DRAFT) by worlddoit

This is a Summary of the Lecture 1

This is a draft cheat sheet. It is a work in progress and is not finished yet.

### Basic operators and functions

 ``==`` exact equality ``!=`` unequal ``>`` bigger ``<`` smaller ``>=`` bigger or equal ``<=`` smaller or equal ``+`` addition ``-`` subtra­ction ``*`` multip­lic­ation ``/`` division ``^`` power ``sqrt(x)`` square root ``exp(x)`` expone­ntial ``log(x)`` logarithm ``sin(x)`` sine ``cos(x)`` cosine ``tan(x)`` tangent ``range(x)`` range min max ``min(x)`` minimum ``max(x)`` maximum ``length(x)`` number of elementsn ``sum(x)`` sum ``mean(x)`` mean ``var(x)`` variance
R as a giant pocket calculator (**Basics)

### Commands and Assign­ments

 Valid names? ``.name1`` ``name.1`` ``name.var_1`` Help commands? ``help.start()`` ``help.search("something")`` ``help(function)`` ``?function`` ``apropos("something")`` Commands? ``x<-­24+10`` ``{x<­-24+10; sqrt(9); 1+1}`` ``assign­("x", 1+1)`` Matrix? ``data <- ````c(1,2,­3,4­,5,­6,7­,8,9)````matrix­(da­ta,­nrow=3,````ncol=3­,by­row­=TRUE)``
(** Basics)

### Relax?

 ``fortune()`` is a function from the fortunes package that contains anecdotes
 ``````install.packages("ctv") library(ctv) available.views() install.views("Psychometrics", coreOnly=TRUE) update.views("Psychometrics") MORE``````