CODEWITHSUNDEEP
r
Anderson Neisse
Anderson Neisse

Reputation: 128

Convert df's rows into matrices inside an array

I have a nxp data frame and I want to convert it to an array with n matrices where each matrix is, let's say, ixj where i+j = p. Considering the following reprex:

library(tidyverse)

df <- tribble(
    ~x1, ~x2, ~x3, ~x4,
    1, 2, 3, 4,
    5, 6, 7, 8)

The desired result is an array with 2 matrices similar to the one produced by:

array(1:8, c(2,2,2))

Would anybody have an efficient method to obtain such results in high dimensional data frames?

Upvotes: 0

Views: 33

Answers (1)

LyzandeR
LyzandeR

Reputation: 37879

With baseR and array:

array(t(df), c(2, 2, 2))
#, , 1
#
#     [,1] [,2]
#[1,]    1    3
#[2,]    2    4
#
#, , 2
#
#     [,1] [,2]
#[1,]    5    7
#[2,]    6    8

Upvotes: 2

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