A Tiny Handbook of R by Mike Allerhand (auth.)

By Mike Allerhand (auth.)

This short offers a roadmap for the R language and programming setting with signposts to additional assets and documentation.

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Allow additional optional arguments to be passed to the mapped function. rm=TRUE to a summary descriptive function to omit missing values from the calculation. 46 For example a function to calculate the standard error of a sample vector x could be defined as follows: [ se ¼ functionðxÞ f þ sdðxÞ=sqrtðlengthðxÞÞ þg The function arguments are declared as the arguments to the function keyword. Here there is just one argument, named x. The calculations performed by the function is defined in the function’s body between f.

Numeric and character index vectors address particular cells by number or by name, and these are returned in the order given in the index. Logical index vectors specify a pattern of cells to be addressed. If necessary the pattern is recycled so that the index vector matches the length of the object being indexed. The index is then applied element-wise and addresses cells corresponding to cells of the logical vector that are TRUE. 6 Sorting There is a function rev that reverses a vector’s order, and a function sort sorts a vector numerically or alphabetically into ascending or descending order.

LibraryðpsychÞ # For'describe:by' [ libraryðabindÞ # For'abind' [ a¼describe:byðiris½1:4Š; iris$SpeciesÞ [ a¼abindða; along¼0Þ [ ftableða; col:vars¼3Þ Tables may be converted to data frames and combined using rbind and cbind. This would be necessary if the tables are to contain both numeric and character data, some columns of numbers and some columns of names. 3 Saving Tables The simplest way to save tables, or any printed output from R, is to use the sink function to divert output to a file in the current working folder.

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