Find the default reduction name in a Seurat object

Usage

DefaultReduction(
  srt,
  pattern = NULL,
  min_dim = 2,
  max_distance = 0.1,
  verbose = TRUE
)

Arguments

srt: A Seurat object.
pattern: Character string containing a regular expression to search for.
min_dim: Minimum dimension threshold.
max_distance: Maximum distance allowed for a match.
verbose: Whether to print the message. Default is TRUE.

Value

Default reduction name.

Examples

data(pancreas_sub)
pancreas_sub <- RunStandardWorkflow(pancreas_sub)
#> ℹ [2026-08-30 04:21:21] Start standard processing workflow...
#> ℹ [2026-08-30 04:21:21] Checking a list of <Seurat>...
#> ! [2026-08-30 04:21:21] Data 1/1 of the `srt_list` is "unknown"
#> Warning: Data 1/1 of the `srt_list` is "unknown"
#> ℹ [2026-08-30 04:21:21] Perform `NormalizeData()` with `normalization.method = 'LogNormalize'` on 1/1 of `srt_list`...
#> ℹ [2026-08-30 04:21:21] Perform `FindVariableFeatures()` on 1/1 of `srt_list`...
#> ℹ [2026-08-30 04:21:21] Use the separate HVF from `srt_list`
#> ℹ [2026-08-30 04:21:22] Number of available HVF: 2000
#> ℹ [2026-08-30 04:21:22] Finished check
#> ℹ [2026-08-30 04:21:22] Perform `ScaleData()`
#> ℹ [2026-08-30 04:21:22] Perform pca linear dimension reduction
#> ℹ [2026-08-30 04:21:22] Use stored estimated dimensions 1:23 for Standardpca
#> ℹ [2026-08-30 04:21:22] Perform `Seurat::FindClusters()` with `cluster_algorithm = 'louvain'` and `cluster_resolution = 0.6`
#> ℹ [2026-08-30 04:21:22] Reorder clusters...
#> ℹ [2026-08-30 04:21:22] Skip `log1p()` because `layer = data` is not "counts"
#> ℹ [2026-08-30 04:21:22] Perform umap nonlinear dimension reduction
#> ✔ [2026-08-30 04:21:29] Standard processing workflow completed
names(pancreas_sub@reductions)
#> [1] "Standardpca"       "StandardpcaUMAP2D" "StandardUMAP2D"   

DefaultReduction(pancreas_sub)
#> [1] "StandardUMAP2D"

DefaultReduction(pancreas_sub, pattern = "pca")
#> [1] "Standardpca"

DefaultReduction(pancreas_sub, pattern = "umap")
#> [1] "StandardUMAP2D"