Get the Number of Monosaccharides — count

Get the number of monosaccharides in a glycan composition or glycan structure. When mono is "generic" (e.g. "Hex", "HexNAc"), it counts all "concrete" monosaccharides that match. For example, "Hex" will count all Glc, Man, Gal, etc. When mono is "concrete" (e.g. "Gal", "GalNAc"), NA is returned when the composition is "generic".

Usage

count_mono(x, mono)

# S3 method for class 'glyrepr_composition'
count_mono(x, mono)

# S3 method for class 'glyrepr_structure'
count_mono(x, mono)

Arguments

x: A glycan composition (glyrepr_composition) or a glycan structure (glyrepr_structure) vector
mono: The monosaccharide to count. A character scalar.

Value

A numeric vector of the same length as x.

Examples

comp <- glycan_composition(c(Hex = 5, HexNAc = 2), c(Gal = 1, Man = 1,GalNAc = 1))
count_mono(comp, "Hex")
#> [1] 5 2
count_mono(comp, "Gal")
#> [1] NA  1

struct <- as_glycan_structure("Gal(b1-3)GlcNAc(b1-4)Glc(a1-")
count_mono(struct, "Gal")
#> [1] 1