dimdim {FatTailsR}

Length and Dimensions of Vector, Matrix, Array, Data.Frame, List

Description

Dimensions and length of vector, matrix, array, data.frame and list. A friendly version of dim that returns the true dimension rather than the sometimes unexpected NULL value. The number of dimensions appears first, then the length in each dimension. A special case is list: the list's length (number of items) is turned into a negative integer and the dimension/length of each item is either positive if the item is a vector, matrix, array or data.frame or negative if the item is itself a list. Only the first level of the list is explored.

dimdim1 and dimdimc return the first item of dimdim, thus the true dimension, either as an integer or as a character and, in this latest case, always "-1" for lists.

Notes: From version 1.6.2 (April 2016), dimdim(NULL) = c(0, 0). (before c(1, 0)). Hence, dimdim1(NULL) = 0 and dimdimc(NULL) = "0". Some problems may occur with S4 objects like dimdim(qualityTools::fracDesign(k = 3, gen = "C = AB")).

Usage

dimdim(x)

dimdim1(x)

dimdimc(x)

Arguments

x

vector, matrix, array, data.frame, list.

Examples

require(timeSeries)

dimdim(NULL) 
dimdim(NA); dimdim(NaN); dimdim(Inf); dimdim(TRUE); dimdim(FALSE)
dimdim(11:39)
dimdim(LETTERS[1:8])
dimdim(matrix(1:60, ncol=5))
dimdim(extractData())
dimdim(as.data.frame(extractData()))
dimdim(data.frame(X=1:2, Y=1:4, Z=LETTERS[1:8]))
dimdim(array(1:240, c(8,6,5)))
dimdim(array(1:240, c(4,2,6,5)))
dimdim(getDSdata())
dimdim(zData)
dimdim(xData)
dimdim(tData)

dimdim1(matrix(1:60, ncol=5))
dimdimc(matrix(1:60, ncol=5))
dimdim1(tData)
dimdimc(tData)