Resample signal assays to a new sampling rate

Resamples all (or selected) numeric assays of a PhysioExperiment object to a new target sampling rate. Both upsampling and downsampling are supported.

Usage

resampleSignal(
  pe,
  target_rate,
  method = c("linear", "spline"),
  assay_names = NULL
)

Arguments

pe

A PhysioExperiment object.

target_rate

Target sampling rate in Hz.

method

Interpolation method: "linear" (default) or "spline".

assay_names

Character vector of assay names to resample. If NULL (default), all numeric assays are resampled.

Value

A new PhysioExperiment with resampled assays, updated samplingRate, and updated metadata$time vector.

References

Oppenheim AV, Willsky AS, Nawab SH (1997). "Signals and Systems." 2nd ed. Prentice Hall.

See also

resampleVector() for resampling individual numeric vectors, synchronizeSignals() for synchronizing multiple experiments.

Examples

pe <- PhysioCore::PhysioExperiment(
  assays = S4Vectors::SimpleList(
    position_x = matrix(sin(seq(0, 2 * pi, length.out = 100)), ncol = 1)
  ),
  colData = S4Vectors::DataFrame(label = "M1", type = "marker"),
  samplingRate = 100
)
pe2 <- resampleSignal(pe, target_rate = 200)
PhysioCore::samplingRate(pe2)  # 200
#> [1] 200