Display a Two-Dimension Version of a Matrix of Vectors

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Description

Displays all values of a matrix of vectors by “unrolling” the object vertically or horizontally.

Usage

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unroll(x, bycol = FALSE, drop = TRUE)

Arguments

x

a list of vectors with a dim attribute of length 0, 1 or 2.

bycol

logical; whether to unroll horizontally (FALSE) or vertically (TRUE).

drop

logical; if TRUE, the result is coerced to the lowest possible dimension.

Details

unroll returns a matrix where elements of x are concatenated (“unrolled”) by row (bycol = FALSE) or by column (bycol = TRUE). NA is used to make rows/columns of equal length.

Vectors and one dimensional arrays are coerced to row matrices.

Value

A vector or matrix.

Author(s)

Vincent Goulet vincent.goulet@act.ulaval.ca and Louis-Philippe Pouliot

See Also

This function was originally written for use in severity.portfolio.

Examples

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x <- list(c(1:3), c(1:8), c(1:4), c(1:3))
(mat <- matrix(x, 2, 2))

unroll(mat)
unroll(mat, bycol = TRUE)

unroll(mat[1, ])
unroll(mat[1, ], drop = FALSE)

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