Apply Function to Unique Structures Only

Apply a function only to the unique structures in a glycan structure vector, returning results in the same order as the unique structures appear. This is useful when you need to perform expensive computations but only care about unique results.

Usage

smap_unique(.x, .f, ..., .parallel = FALSE)

Arguments

.x

A glycan structure vector (glyrepr_structure).

.f

A function that takes an igraph object and returns a result. Can be a function, purrr-style lambda (~ .x$attr), or a character string naming a function.

...

Additional arguments passed to .f.

.parallel

Logical; whether to use parallel processing. If FALSE (default), parallel processing is disabled. Set to TRUE to enable parallel processing. See examples in smap for how to set up and use parallel processing.

Value

A list with results for each unique structure, named by their hash codes.

Examples

# Create a structure vector with duplicates
core1 <- o_glycan_core_1()
structures <- glycan_structure(core1, core1, core1)  # same structure 3 times

# Only compute once for the unique structure
unique_results <- smap_unique(structures, igraph::vcount)
length(unique_results)  # 1, not 3
#> [1] 1

# Use purrr-style lambda
unique_results2 <- smap_unique(structures, ~ igraph::vcount(.x))
length(unique_results2)  # 1, not 3
#> [1] 1