EGRET (version 2.3.0)

selectDays: Creates a subset data frame that only contains data for the specified period of analysis

Description

This function uses the user-defined 'period of analysis', and subsets the data. If you want to examine your data set as a time series of water years, then the period of analysis is October through September. If you want to examine the data set as calendar years then the period of analysis is January through December. You might want to examine the winter season, which you could define as December through February, then those 3 months become the period of analysis. The only constraints on the definition of a period of analysis are these: it must be defined in terms of whole months; it must be a set of contiguous months (like March-April-May), and have a length that is no less than 1 month and no more than 12 months. Define the PA by using two arguments: paLong and paStart. paLong is the length of the period of analysis, and paStart is the starting month.

Usage

selectDays(df, paLong, paStart)

Arguments

df

dataframe with Q

paLong

a numeric value for the length of the period of analysis, must be an integer from 1 to 12

paStart

a numeric value for the starting month of the period of analysis, must be an integer from 1 to 12

Value

• localDaily a data frame containing the daily data but only for the period of analysis (not all months)

Examples

eList <- Choptank_eList
Daily <- getDaily(eList)
DailySubset <- selectDays(Daily, 4, 11)