Shifting of ring-data frames

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Description

Ring-data frames are reshaped into multilevel data frames (or vice versa). SI units of the processed chronologies can be changed.

Usage

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shiftFrame(rd, lev.nm = c("plot", "tree", "sample"), which.x = NULL, 
    un = NULL)

Arguments

rd

data.frame. Ring-data frame (see details), or multilevel data frame (see value).

lev.nm

for the case of ring-data frames, character vector with names of the factor-level columns in the final multilevel data frame, beginning with name of the highest level column and ending with the name of the lowest level column. If rd is a multilevel data frame then this argument is ignored.

which.x

for the case of multilevel data frames, character name of the column to be reshaped into a ring-data frame. If NULL then the first numeric column is processed. If rd is a ring-data frame then this argument is ignored.

un

NULL, one, or two character names of SI units to record/transform the processed variables. One character records metric system; two characters with the form c(initial, final) change SI units in the processed data. Defined SI units are micrometers 'mmm', milimeters 'mm', centimeters 'cm', decimeters 'dm', or meters 'm'. If NULL then no metric system is recorded.

Details

Rows of ring-data frames should be named with chronological years, and columns of such data frames should be labeled with level units defined by sample design. Level units in labels are separated with dot (.), beginning with names of higher level units (i.e. ecorregion, climatic location, or plot) and ending with the lowest level unit (usually sample/replicate). For example, the code name of core 'a' in tree '2' on plot 'P16001' on ecorregion 'M1' will have the name: 'M1.P16001.2.a'.

Value

If rd is a ring-data frame then output is a multilevel data frame with the reshaped variable in the first column and years on the second one, followed by factor-level columns from the column with the lowest level units (sample/replicate) to the column with the higest possible level units. If rd is a multilevel data frame then the output is a ring-data frame (see details).

Author(s)

Wilson Lara <wilarhen@gmail.com>, Felipe Bravo <fbravo@pvs.uva.es>

Examples

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##Multilevel data frame of tree-ring widths:
data(Prings05,envir = environment())

## Reshaping multilevel data into a ring-data frame:
pwide <- shiftFrame(Prings05)
str(pwide)
## Reshaping the ring-data frame into the initial multilevel data,
## and defining SI units:
plong <- shiftFrame(pwide,un = 'mmm')
str(plong)