Annual maximum extraction
Extracts the annual maximum peaks from a data.frame which has dates in the first column and variable in the second.
AMextract(x, Plot = TRUE)
x |
a data.frame with dates (or POSIXct) in the first column and variable in the second |
Plot |
a logical argument with a default of TRUE. If TRUE the extracted annual maximum is plotted |
The peaks are extracted based on the UK hydrological year, which starts October 1st and ends September 30th. If there are NAs for full years in the data, an -Inf will be returned for that year.
a data.frame with columns; WaterYear and AM
Anthony Hammond
#Extract the Thames AMAX daily mean flow and display the first six rows ThamesAM <- AMextract(ThamesPQ[,c(1,3)]) head(ThamesAM)
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