select_by_file_extension

Sometimes it makes sense to apply a function to several files in a folder, but only to
those of a particular file type. This function can selects all elements in a vector of strings
that end in a particular way, e.g. on a common file extension.

utility

The phenology of plants (i.e. the timing of their annual life
phases) depends on climatic cues. For temperate trees and many other plants,
spring phases, such as leaf emergence and flowering, have been found to result
from the effects of both cool (chilling) conditions and heat. Fruit tree
scientists (pomologists) have developed some metrics to quantify chilling
and heat (e.g. see Luedeling (2012) <doi:10.1016/j.scienta.2012.07.011>).
'chillR' contains functions for processing temperature records into
chilling (Chilling Hours, Utah Chill Units and Chill Portions) and heat units
(Growing Degree Hours). Regarding chilling metrics, Chill Portions are often
considered the most promising, but they are difficult to calculate. This package
makes it easy. 'chillR' also contains procedures for conducting a PLS analysis
relating phenological dates (e.g. bloom dates) to either mean temperatures or
mean chill and heat accumulation rates, based on long-term weather and phenology
records (Luedeling and Gassner (2012) <doi:10.1016/j.agrformet.2011.10.020>).
As of version 0.65, it also includes functions for generating weather
scenarios with a weather generator, for conducting climate change analyses
for temperature-based climatic metrics and for plotting results from such
analyses. Since version 0.70, 'chillR' contains a function for interpolating
hourly temperature records.

Eike Luedeling

chillR

Statistical Methods for Phenology Analysis in Temperate Fruit
Trees

Lars Caspersen

Eduardo Fernandez

select_by_file_extension function

<dl><dt>strings</dt>
<dd>vector of character strings for elements to be extracted from.</dd>
<dt>file_extension</dt>
<dd>character string specifying the extension of the file type to be selected.
This can also be any other trailing string that marks all vector elements to be selected.</dd></dl>

Arguments

Author

Select string that end in a particular way (e.g. a certain file extension) — select_by_file_extension

<dl>

<dt>strings</dt>
<dd>vector of character strings for elements to be extracted from.</dd>


<dt>file_extension</dt>
<dd>character string specifying the extension of the file type to be selected.
This can also be any other trailing string that marks all vector elements to be selected.</dd>

</dl>

select_by_file_extension: Select string that end in a particular way (e.g. a certain file extension)

Description

Usage

Value

Arguments

Author

Examples