RespirAnalyzer (version 1.0.2)

find.peaks: Function to find the peak-to-peak intervals of a respiratory signal.

Description

function to find the peak-to-peak intervals of a respiratory signal.

Usage

find.peaks(
  y,
  Fs,
  lowpass = TRUE,
  freq = 1,
  MovingAv = FALSE,
  W = FALSE,
  filter = TRUE,
  threshold = 0.2
)

Value

a dataframe for the information of peaks. "PeakIndex" is the position of the peaks and "PeakHeight" is the height of the peaks

Arguments

y

a numeric vector, with respiratory data for a regularly spaced time series..

Fs

a positive value. sampling frequency of airflow signal.

lowpass

logical. Whether to use low-pass filtering to preprocess the airflow signal.

freq

an optional values. Cut-off frequency of low-pass filter. The default value is 1.

MovingAv

logical.Whether to use Moving Average to preprocess the airflow signal.

W

an optional values. the windows of Moving Average. The default value is equal to the sampling frequency Fs.

filter

logical.Whether to filter the points of peaks.

threshold

an optional value. A threshold is the minimum height difference between the wave crest and wave trough. The default value is 0.2.

References

Zhang T, Dong X, Chen C, Wang D, Zhang XD. RespirAnalyzer: an R package for continuous monitoring of respiratory signals.

Examples

data("TestData") # load Data from TestData dataset
Fs=50 ## sampling frequency is 50Hz
Peaks <- find.peaks(Data[,2],Fs,lowpass=TRUE,freq=1,MovingAv=FALSE,
                    W=FALSE,filter=TRUE,threshold=0.05)
Peaks