Essentials of the R Language
Michael Joseph Crawley · 2007
This chapter contains sections titled: Screen prompt Built-in Functions Numbers with Exponents Modulo and Integer Quotients Rounding Infinity and Things that Are Not a Number (NaN) Missing values NA Assignment Operators Creating a Vector Named Elements within Vectors Vector Functions Summary Information from Vectors by Groups Using with rather than attach Using attach in This Book Parallel Minima and Maxima: pmin and pmax Subscripts and Indices Working with Vectors and Logical Subscripts Addresses within Vectors Finding Closest Values Trimming Vectors Using Negative Subscripts Logical Arithmetic Evaluation of combinations of TRUE and FALSE Repeats Generate Factor Levels Generating Regular Sequences of Numbers Variable Names Sorting, Ranking and Ordering The sample Function Matrices Arrays Character Strings The match Function Writing functions in R Variance Degrees of freedom Variance Ratio Test Using Variance Error Bars Loops and Repeats The switch Function The Evaluation Environment of a Function Scope Optional Arguments Variable Numbers of Arguments (…) Returning Values from a Function Anonymous Functions Flexible Handling of Arguments to Functions Evaluating Functions with apply, sapply and lapply Looking for runs of numbers within vectors Saving Data Produced within R to Disc Pasting into an Excel Spreadsheet Writing an Excel Readable File from R Testing for Equality Sets: union, intersect and setdiff Pattern Matching Testing and Coercing in R Dates and Times in R