difference_byname: Name-wise subtraction of matrices

In matsbyname: An Implementation of Matrix Mathematics that Respects Row and Column Names

Name-wise subtraction of matrices

Description

Name-wise subtraction of matrices

Usage

difference_byname(minuend, subtrahend)

Arguments

minuend	matrix or constant
subtrahend	matrix or constant Performs a union and sorting of row and column names prior to differencing. Zeroes are inserted for missing matrix elements.

Value

A matrix representing the name-wise difference between minuend and subtrahend

Examples

library(dplyr)
difference_byname(100, 50)
commoditynames <- c("c1", "c2")
industrynames <- c("i1", "i2")
U <- matrix(1:4, ncol = 2, dimnames = list(commoditynames, industrynames)) %>%
  setrowtype("Commodities") %>% setcoltype("Industries")
G <- matrix(rev(1:4), ncol = 2, dimnames = list(rev(commoditynames), rev(industrynames))) %>%
  setrowtype("Commodities") %>% setcoltype("Industries")
U - G # Non-sensical. Row and column names not respected.
difference_byname(U, G) # Row and column names respected! Should be all zeroes.
difference_byname(100, U)
difference_byname(10, G)
difference_byname(G) # When subtrahend is missing, return minuend (in this case, G).
difference_byname(subtrahend = G) # When minuend is missing, return - subtrahend (in this case, -G)
# This also works with lists
difference_byname(list(100, 100), list(50, 50))
difference_byname(list(U,U), list(G,G))
DF <- data.frame(U = I(list()), G = I(list()))
DF[[1,"U"]] <- U
DF[[2,"U"]] <- U
DF[[1,"G"]] <- G
DF[[2,"G"]] <- G
difference_byname(DF$U, DF$G)
DF %>% mutate(diffs = difference_byname(U, G))

matsbyname documentation built on June 8, 2025, 10:08 a.m.