filterTrajFeaturesByDL: Filter trajectory features by Detection Level (DL)
In CellTrails: Reconstruction, visualization and analysis of branching trajectories

Description Usage Arguments Details Value Author(s) See Also Examples

Filters trajectory features that are detected in a minimum number of samples.

1	filterTrajFeaturesByDL(sce, threshold, show_plot = TRUE)

`sce`	An `SingleCellExperiment` object
`threshold`	Minimum number of samples; if value < 1 it is interpreted as fraction, otherwise as absolute sample count
`show_plot`	Indicates if plot should be shown (default: TRUE)

The detection level denotes the fraction of samples in which a feature was detected. For each trajectory feature listed in the CellTrailsSet object the relative number of samples having a feature expression value greater than 0 is counted. Features that are expressed in a fraction of all samples greater than threshold remain labeled as trajectory feature as listed in the SingleCellExperiment object, otherwise they may be not considered for dimensionality reduction, clustering, and trajectory reconstruction. If the parameter threshold fullfills threshold >= 1 it becomes converted to a relative fraction of the total sample count. Please note that spike-in controls are ignored and are not listed as trajectory features.

A character vector

Daniel C. Ellwanger

trajFeatureNames

# Example data
set.seed(1101)
dat <- simulate_exprs(n_features=15000, n_samples=100)

# Create container
alist <- list(logcounts=dat)
sce <- SingleCellExperiment(assays=alist)

# Filter features
tfeat <- filterTrajFeaturesByDL(sce, threshold=2)
head(tfeat)

# Set trajectory features to object
trajFeatureNames(sce) <- tfeat

# Number of features
length(trajFeatureNames(sce)) #filtered
nrow(sce) #total