TimeSinceStart {pvldcurve}

Time Since Start

Description

Calculates time since start (min) of measurement for temporally repeated measurements

Usage

TimeSinceStart(data, sample = "sample",
  date.and.time = "date.and.time")

Arguments

data

data frame containing at least a column giving the the time (and date) of the measurements ordered by sample and chronologically. A column containing the sample IDs is optionally required if several samples were measured.

sample

optional name of the column in data containing the sample IDs, default: "sample".

date.and.time

optional name of the column in data containing the time (and date) as class POSIXct, default: "date.and.time"

Value

The original data frame extended by a numerical vector containing time since start (min) of the measurements.

Examples

# get example data frame
df <- leaf_drying_data

# extend df by time since start
df_with_tss <- TimeSinceStart(df)