psyosphere (version 0.1.6)

des_first: Get first value within each track

Description

Get first value within each track

Usage

des_first(
  tracks, ctarget, cgaps = "", cname = "first", drop = TRUE, t_id = "id",
  des_df = ""
)

Arguments

tracks

psyo. Data frame with tracks.

ctarget

character. Column name of tracks that contains the variable for the calculation.

cgaps

character. Column name of tracks that marks gaps with TRUE.

cname

character. Column name of the returned calculation result.

drop

logical. If TRUE and only one observation is returned drop the data frame and collapse the return value to a vector.

t_id

character or numeric. Column name in tracks that identifies the separate tracks.

des_df

data frame. Function results will be merge with this data frame.

Value

Data frame

t_id

unique id of the track

cname

calculated result of the track

Credit

If you use 'psyosphere' for commercial use or research, please support us by include one off the following references:

• MIT license: "psyosphere" by B. Ziepert, E. G. Ufkes & P. W. de Vries from https://CRAN.R-project.org/package=psyosphere

• APA: Ziepert, B., Ufkes, E., & de Vries, P. W. (2018). psyosphere: Analyse GPS Data. Retrieved from https://CRAN.R-project.org/package=psyosphere

• APA: Vries, P., Ziepert, B., & Ufkes, E. (2016). "De psychologie van bewegingen GPS-technologie voor de analyse van natuurlijk gedrag." Tijdschrift voor Human Factors 2: 11-15.

See Also

des_summary, des_duplicates, des_last, des_length, des_max, des_min, des_mean, des_sd, des_sum

Examples

# NOT RUN {
# Print title
cat("\nTesting des_first()\n")

# Calculations
data(psyo_rounds2)
first <- des_first(psyo_rounds2, "p_id")
# }