applyWindows: applyWindows

Description Usage Arguments Details Value Author(s)

View source: R/PartitioningLasslop10.R

Description

apply a function to several windows of a data.frame

Usage

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applyWindows(ds, FUN, prevRes = list(), winSizeInDays = winSizeRefInDays, 
    winSizeRefInDays = 4L, strideInDays = floor(winSizeRefInDays/2L), 
    isVerbose = TRUE, nRecInDay = 48L, ...)

Arguments

ds

dataframe to iterate

FUN

function to apply to subsets of the data.frame taking a subset of the data.frame as first argument the second: a one-row data.frame with window information (iWindow, dayStart, dayEnd, iRecStart, iRecEnd, iCentralRec) the third a list that can transport values from previous fits, i.e. the third item of its return value with first item a list (objects that cannot be rowbound) second item a single row data.frame (summary that can be row-bound) third item a list that is will be provided to the call of this function on the next window as the second argument

prevRes

initial values for the list that is carried between windows

winSizeInDays

Window size in days

winSizeRefInDays

Window size in days for reference window (e.g. day-Window for night time)

strideInDays

step in days for shifting the window, for alligning usually a factor of winSizeRef

isVerbose

set to FALSE to suppress messages

nRecInDay

number of records within one day (for half-hourly data its 48)

...

further arguments to FUN

Details

Assumes equidistant rows with nRecInDay records forming one day and reporting full days i.e. all of the nRecInDay records are in the first day.

In order to have a common reference winSizeRefInDays is given so that results by a different window size correspond to each window of shifting a window of winSizeRefInDays Each window is anchord so that the center equals the center of the reference window. This becomes important when selecting records at the edges of the series.

Value

a list with components that correspond to the three result components of FUN

resOptList

a list with restults of length nrow(ds)

summary

a data.frame with nrow(ds) rows, also including window information (iWindow, dayStart, dayEnd, iRecStart, iRecEnd, iCentralRec)

prevRes

last result of the values carried over between windows

Author(s)

(Department for Biogeochemical Integration at MPI-BGC, Jena, Germany)


REddyProc documentation built on May 31, 2017, 3:09 a.m.