smap_predicates: Test Predicates on Glycan Structure Vectors

In glyrepr: Representation for Glycan Compositions and Structures

Test Predicates on Glycan Structure Vectors

Description

These functions test predicates on unique structures in a glycan structure vector, taking advantage of hash-based deduplication to avoid redundant computation. Similar to purrr predicate functions, but optimized for glycan structure vectors.

Usage

ssome(.x, .p, ...)

severy(.x, .p, ...)

snone(.x, .p, ...)

Arguments

.x	A glycan structure vector (glyrepr_structure).
.p	A predicate function that takes an igraph object and returns a logical value. Can be a function, purrr-style lambda (~ .x$attr), or a character string naming a function.
...	Additional arguments passed to .p.

Details

These functions only evaluate .p once for each unique structure, making them much more efficient than applying .p to each element individually when there are duplicate structures.

Return Values:

• ssome(): Returns TRUE if at least one unique structure satisfies the predicate

• severy(): Returns TRUE if all unique structures satisfy the predicate

• snone(): Returns TRUE if no unique structures satisfy the predicate

Value

A single logical value.

Examples

# Create a structure vector with duplicates
core1 <- o_glycan_core_1()
core2 <- n_glycan_core()
structures <- c(core1, core2, core1)  # core1 appears twice

# Test if some structures have more than 5 vertices
ssome(structures, function(g) igraph::vcount(g) > 5)

# Test if all structures have at least 3 vertices
severy(structures, function(g) igraph::vcount(g) >= 3)

# Test if no structures have more than 20 vertices
snone(structures, function(g) igraph::vcount(g) > 20)

# Use purrr-style lambda functions
ssome(structures, ~ igraph::vcount(.x) > 5)
severy(structures, ~ igraph::vcount(.x) >= 3)
snone(structures, ~ igraph::vcount(.x) > 20)

glyrepr documentation built on Sept. 22, 2026, 5:09 p.m.