Type: Package
Title: Data Science Box of Pandora Miscellaneous
Version: 0.3.3
Date: 2020-09-11
Description: Tool collection for common and not so common data science use cases. This includes custom made algorithms for data management as well as value calculations that are hard to find elsewhere because of their specificity but would be a waste to get lost nonetheless. Currently available functionality: find sub-graphs in an edge list data.frame, find mode or modes in a vector of values, extract (a) specific regular expression group(s), generate ISO time stamps that play well with file names, or generate URL parameter lists by expanding value combinations.
License: GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
Imports: Rcpp (≥ 1.0.1), stringr
LinkingTo: Rcpp
RoxygenNote: 7.1.1
Encoding: UTF-8
SystemRequirements: C++11
Suggests: covr, testthat, spelling
Language: en-US
NeedsCompilation: yes
Packaged: 2020-09-11 18:57:01 UTC; peter
Author: Peter Meissner [aut, cre]
Maintainer: Peter Meissner <retep.meissner@gmail.com>
Repository: CRAN
Date/Publication: 2020-09-12 05:40:13 UTC

df_defactorize

Description

df_defactorize

Usage

df_defactorize(df)

Arguments

df

a data.frame like object

Value

returns the same data.frame except that factor columns have been transformed into character columns

Examples


df <- 
  data.frame(
    a = 1:2, 
    b = factor(c("a", "b")), 
    c = as.character(letters[3:4]), 
    stringsAsFactors = FALSE
 )
vapply(df, class, "")

df_df <- df_defactorize(df)
vapply(df_df, class, "")

Subgraphs in Undirected Graphs/Networks

Description

Finding and indexing subgraphs in undirected graph.

Usage

graphs_find_subgraphs(id_1, id_2, verbose = 1L)

Arguments

id_1

vector of integers indicating ids

id_2

vector of integers indicating ids

verbose

in integer indicating the amount of verbosity; good for long running tasks or to get more information about the workings of the algorithm; currently accepted values: 0, 1, 2

Details

Input is given as two vectors where each pair of node ids 'id_1[i]' - 'id_2[i]' indicates an edge between two nodes.

Value

An integer vector with subgraph ids such that each distinct subgraph - i.e. all nodes are reachable within the graph and no node outside the subgraph is reachable - gets a distinct integer value. Integer values are assigned via

Examples


graphs_find_subgraphs(c(1,2,1,5,6,6), c(2,3,3,4,5,4), verbose = 0)
graphs_find_subgraphs(c(1,2,1,5,6,6), c(2,3,3,4,5,4), verbose = 2)

Mode

Description

Function calculating the mode.

Usage

stats_mode(x, multimodal = FALSE, warn = TRUE)

Arguments

x

vector to get mode for

multimodal

wether or not all modes should be returned in case of more than one

warn

should the function warn about multimodal outcomes?

Value

vector of mode or modes

Mode Allowing for Multi Modal Mode

Description

Function calculating the mode, allowing for multiple modes in case of equal frequencies.

Usage

stats_mode_multi(x)

Arguments

x

vector to get mode for

Value

vector with all modes

Extract Regular Expression Groups

Description

Extract Regular Expression Groups

Usage

str_group_extract(string, pattern, group = NULL, nas = TRUE)

Arguments

string

string to extract from

pattern

pattern with groups to match

group

groups to extract

nas

return NA values (TRUE) or filter them out (FALSE)

Value

string vector or string matrix

Examples


strings <- paste(LETTERS, seq_along(LETTERS), sep = "_")
str_group_extract(strings, "([\\w])_(\\d+)")
str_group_extract(strings, "([\\w])_(\\d+)", 1)
str_group_extract(strings, "([\\w])_(\\d+)", 2)

Time Stamps for File Names

Description

Generating file name ready iso time stamps.

Usage

time_stamp(ts = Sys.time(), sep = c("-", "_", "_"))

Arguments

ts

one or more POSIX time stamp

sep

separators to be used for formatting

Value

Returns timestamp string in format yyyy-mm-dd_HH_MM_SS ready to be used safely in file names on various operating systems.

Examples


time_stamp()
time_stamp( Sys.time() - 10000 )

URL Parameter Combinations

Description

Generate URL parameter combinations from sets of parameter values.

Usage

web_gen_param_list_expand(..., sep_1 = "=", sep_2 = "&")

Arguments

...

multiple vectors passed on as named arguments or a single list or a data.frame

sep_1

first separator to use between key and value

sep_2

second separator to use between key-value pairs

Value

string vector with assembled query string parameter combinations

Examples


web_gen_param_list_expand(q = "beluga", lang = c("de", "en"))