t_speed: Add speed

Description Usage Arguments Details Value Note Author(s) See Also Examples

View source: R/t_speed.R

Description

Speed towards the next coordinate in the track in kmh.

Usage

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t_speed(
  tracks, bind = TRUE, drop = TRUE, cname = "speed", t_id = "id"
)

Arguments

tracks

psyo. Data frame with tracks.

bind

logical. Return the distance as list (FALSE) or add it to tracks (TRUE).

drop

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

cname

character. Column name of the returned calculation result.

t_id

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

Details

For the last coordinate within a track the function returns NA because there is no speed towards a following coordinate possible.

Value

psyo

Note

The speed between the first and the second point is stored with the second point. This is done for higher compatibility with the gap functions.

Author(s)

Benjamin Ziepert. Please send feedback to: feedback-psyosphere@analyse-gps.com.

See Also

t_bearing,t_distance, t_time_difference

Examples

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## Not run: 
data(psyo)
psyo <- t_speed(psyo)

## End(Not run)

psyosphere documentation built on July 2, 2020, 12:08 a.m.