colprods_byname {matsbyname}

Column products, sorted by name

Description

Calculates column products (the product of all elements in a column) for a matrix. An optional rowname for the resulting row vector can be supplied. If rowname is NULL or NA (the default), the row name is set to the row type as given by rowtype(a).

Usage

colprods_byname(a, rowname = NA)

Arguments

a

A matrix or data frame from which column products are desired.

rowname

The Name of the output row containing column products.

Value

a row vector of type matrix containing the column products of a.

Examples

library(dplyr)
M <- matrix(c(1:6), nrow = 2, dimnames = list(paste0("i", 1:2), paste0("c", 3:1))) %>%
  setrowtype("Industries") %>% setcoltype("Commodities")
colprods_byname(M)
colprods_byname(M, rowname = "E.ktoe")
M %>% colprods_byname %>% rowprods_byname
# This also works with lists
colprods_byname(list(M, M))
colprods_byname(list(M, M), rowname = "E.ktoe")
colprods_byname(list(M, M), rowname = NA)
colprods_byname(list(M, M), rowname = NULL)
DF <- data.frame(M = I(list()))
DF[[1,"M"]] <- M
DF[[2,"M"]] <- M
colprods_byname(DF$M[[1]])
colprods_byname(DF$M)
colprods_byname(DF$M, "prods")
res <- DF %>% mutate(
  cs = colprods_byname(M),
  cs2 = colprods_byname(M, rowname = "prod")
)
res$cs2