which.max over water year periods — rvn_apply_wyearly_which_max

Applies the which.max function within each water year period, and returns the corresponding max values and dates in an xts format.

rvn_apply_wyearly_which_max_xts(x, mm = 9, dd = 30)

Arguments

x: xts object
mm: month of water year ending (default 9)
dd: day of water year (default 30)

Value

xts object with max values and corresponding dates

Examples

data(rvn_hydrograph_data)

# obtain peak observed flows in each water year period
rvn_apply_wyearly_which_max_xts(rvn_hydrograph_data$hyd$Sub43_obs)
#>            Sub43_obs
#> 2003-03-24       103
#> 2004-03-08       258

# will return a warning with no result if multiple columns supplied
rvn_apply_wyearly_which_max_xts(rvn_hydrograph_data$hyd)
#> Warning: x must be an xts object with one numeric column
#> [1] FALSE