cumulative_day: Function to detect year transitions and calculate cumulative...

In ShellChron: Builds Chronologies from Oxygen Isotope Profiles in Shells

Description

Takes the result of iterative growth modeling and transforms data from Julian Day (0 - 365) to cumulative day of the shell age by detecting where transitions from one year to the next occur and adding full years (365 days) to simulations in later years.

Usage

cumulative_day(
  resultarray,
  plotyearmarkers = TRUE,
  export_peakid = TRUE,
  path = tempdir()
)

Arguments

resultarray	Array containing the full results of the optimized growth model
plotyearmarkers	Should the location of identified year transitions be plotted? TRUE/FALSE
export_peakid	Should the result of peak identification be plotted? TRUE/FALSE
path	Export path (defaults to tempdir())

Value

A new version of the Julian Day tab of the resultarray with Julian Day model estimates replaced by estimates of cumulative age of the record in days.

References

package dependencies: zoo 1.8.7; scales 1.1.0; graphics function dependencies: peakid

Examples

testarray <- array(NA, dim = c(40, 36, 9)) # Create empty array
# with correct third dimension
windowfill <- seq(50, 500, 50) %% 365 # Create dummy simulation data 
# (ages) to copy through the array
for(i in 6:length(testarray[1, , 1])){
    testarray[, i, 3] <- c(windowfill, rep(NA, length(testarray[, 1, 3]) - 
        length(windowfill)))
    windowfill <- c(NA, (windowfill + 51) %% 365)
}
# Add dummy /code{D} column.
testarray[, 1, 3] <- seq(1, length(testarray[, 1, 3]), 1)
# Add dummy YEARMARKER column
testarray[, 3, 3] <- c(0, rep(c(0, 0, 0, 0, 0, 0, 1), 5), 0, 0, 0, 0)
# Add dummy d18Oc column
testarray[, 2, 3] <- sin((2 * pi * (testarray[, 1, 3] - 8 + 7 / 4)) / 7)
testarray2 <- suppressWarnings(cumulative_day(testarray, FALSE, FALSE, tempdir()))
# Apply function on array

ShellChron documentation built on July 5, 2021, 5:06 p.m.