Count the number of matrix entries in rows that meet a criterion — count_vals_inrows

Expressions can be written in a natural way such as count_vals_inrows_byname(m, "<=", 1).

Usage

count_vals_inrows_byname(
  a,
  compare_fun = c("==", "!=", "<", "<=", ">=", ">"),
  val = 0
)

Arguments

a: a matrix or list of matrices whose values are to be counted by rows according to compare_fun
compare_fun: the comparison function, one of "==", "!=", "<", "<=", ">", or ">=". Default is "==".
val: the value against which matrix entries are compared. Default is 0.

Value

an matrix with a single column indicating the number of entries in a

that meet the specified criterion in each row of a

Details

Either a single matrix or a list of matrices can be given as the a argument. compare_fun can be specified as a string ("!=") or as a back-quoted function (`!=`).

Examples

m <- matrix(c(0, 1, 2, 3, 4, 0), nrow = 3, ncol = 2)
count_vals_inrows_byname(m) # uses defaults: compare_fun = "==" and val = 0
#>      [,1]
#> [1,]    1
#> [2,]    0
#> [3,]    1
count_vals_inrows_byname(m, compare_fun = "!=")
#>      [,1]
#> [1,]    1
#> [2,]    2
#> [3,]    1
count_vals_inrows_byname(m, compare_fun = `!=`)
#>      [,1]
#> [1,]    1
#> [2,]    2
#> [3,]    1
# Write expressions in a natural way
count_vals_inrows_byname(m, "<=", 1)
#>      [,1]
#> [1,]    1
#> [2,]    1
#> [3,]    1
# Also works for lists
count_vals_inrows_byname(list(m,m), "<=", 1)
#> [[1]]
#>      [,1]
#> [1,]    1
#> [2,]    1
#> [3,]    1
#> 
#> [[2]]
#>      [,1]
#> [1,]    1
#> [2,]    1
#> [3,]    1
#>