1 .. -*- coding: utf-8 -*-

     2 

     3 ===

     4  R

     5 ===

     6 .. contents::

     7    :local:

     8 

     9 Inspecting objects

    10 ==================

    11 

    12 Info about object dimensions::

    13 

    14   length(c(1,2,3))

    15   dim(matrix(1:6, 2, 3))

    16 

    17 Brief info about any object::

    18 

    19   typeof(str)

    20   str(c(1, 2))

    21   str(summary)

    22 

    23 Brief info about vectors and matrixes::

    24 

    25   summary(1:8)

    26   summary(matrix(1:20, 4, 5))

    27 

    28 Brief info on datasets and matrixes::

    29 

    30   names(list(colA=1, colB=2))

    31 

    32 Debugging

    33 =========

    34 

    35 To mark function for debugging call::

    36 

    37   debug(fun, text = "", condition = NULL)

    38   debugonce(fun, text = "", condition = NULL)

    39 

    40 To return function to normal execution::

    41 

    42   undebug(fun)

    43   isdebugged(fun)

    44 

    45 Generating random numbers

    46 =========================

    47 

    48 For each distribution there are exists corresponding generation function, named

    49 with prefix ``r``::

    50 

    51   rnorm(n, mean = 0, sd = 1)

    52   rt(n, df, ncp)

    53   rbinom(n, size, prob)

    54   rpois(n, lambda)

    55   runif(n, min = 0, max = 1)

    56 

    57 In order to generate predictable sequences use::

    58 

    59   set.seed(seed, kind = NULL, normal.kind = NULL)

    60