GGIR (version 2.5-0)

g.applymetrics: Extract metrics from acceleration signals

Description

Function to extract metrics from acceleration signal. Not intended for direct use by user

Usage

g.applymetrics(data,n,sf,ws3,metrics2do,lb=0.2, hb=15)

Arguments

data

Three column matrix with x, y, and z acceleration data

n

filter order, only needed if a metric is selected that involves a frequency filter

sf

sample frequency

ws3

Epoch size in seconds

metrics2do

Dataframe with Boolean indicator for all metrics whether they should be extracted or not. For instance, metrics2do$do.bfen = TRUE, indicates that the bfen metric should be extracted

lb

see g.metric

hb

see g.metric

Value

Dataframe with metric values in columns average per epoch (ws3)

Examples

# NOT RUN {
  Gx = runif(n=10000,min=0,max=2)
  Gy = runif(n=10000,min=1,max=3)
  Gz = runif(n=10000,min=0,max=2)
  data = cbind(Gx, Gy, Gz)
  metrics2do = data.frame(do.bfen=TRUE,do.enmo=TRUE,do.lfenmo=FALSE,
  do.en=FALSE,do.hfen=FALSE,do.hfenplus=FALSE,do.mad=FALSE,do.anglex=FALSE,
  do.angley=FALSE,do.anglez=FALSE,do.roll_med_acc_x=FALSE,
  do.roll_med_acc_y=FALSE,do.roll_med_acc_z=FALSE,
  do.dev_roll_med_acc_x=FALSE,do.dev_roll_med_acc_y=FALSE,
  do.dev_roll_med_acc_z=FALSE,do.enmoa=FALSE,
  do.lfx=FALSE, do.lfy=FALSE, do.lfz=FALSE, 
                          do.hfx=FALSE, do.hfy=FALSE, do.hfz=FALSE, 
                          do.bfx=FALSE, do.bfy=FALSE, do.bfz=FALSE,
                          do.zcx=FALSE, do.zcy=FALSE, do.zcz=FALSE)
  extractedmetrics = g.applymetrics(data,n=4,sf=40,ws3=5,metrics2do)
# }