getIFI function

Inter-Flood Interval (IFI)

Compute Inter-Flood Interval (IFI) from the given residual values.

getIFI(resid, years, lowflow.start, lowflow.end, unique.years,
  for.year = NULL)

Arguments

• resid: A vector of residual values generated with respect to the baseline signal

• years: A vector of years corrosponding to the residual values

• lowflow.start: A vector giving start index of low-flow window in each year

• lowflow.end: A vector giving end index of low-flow window in each year

• unique.years: A vector or year values corresponding to the highflow.start

  and highflow.end values.

• for.year: (optional) Calculate IFI values only for the given year in this argument. If argument is omitted, IFI values for all years are calculated.

Returns

Data frame containing two columns:

year	First column, represents year
IFI	Second column, represents IFI values

Examples

# load sample data
data("sycamore")
x = sycamore

# get streamflow object for the sample data
x.streamflow = asStreamflow(x)

# prepare baseline signal 
x.bl = prepareBaseline(x.streamflow)

# signal parts
x.sp = getSignalParts(x.bl$pred2, candmin = c(40:125), candmax = c(190:330),
                      years = x.streamflow$data$year, 
                      months = x.streamflow$data$month,
                      jdays = x.streamflow$data$jday)

# IFI
ifi = getIFI(x.bl$resid.sig, x.streamflow$data$year, x.sp$LF.window.start, 
             x.sp$LF.window.end, x.sp$year)