set_start_frame: Set a new starting frame
In Ax3man/trackr: Analyze and Visualize Tracking Data

Description Usage Arguments Details Value Examples

Pick a new frame as the starting frame, which will become frame 1. You can use either a single frame number for all trials using value, or you can supply a different frame number for each trial using tab.

1 2	set_start_frame(tracks, value = NULL, tab = NULL, frame = "frame", trial = "trial")

`tracks`	A tracks object.
`value`	A single value to set as the start frame.
`tab`	A data.frame with trial names and start frames. Use `frame` and `trial` to choose which variables are used.
`frame`	The column from `tab` that is used as the starting frame. By default this is `'frame'`.
`trial`	The column from `tab` that is used as the trial identifier. By default this is `'trial'`.

All values below the start frame will be filtered out.

A tracks object.

  Guppies <- as_tracks(guppies, 30, '1080p')
  # Normally this dataset starts from frame 10000:
  Guppies$tr
  # But we can easily set that to 1 instead:
  set_start_frame(Guppies, 10000)$tr
  # Or we can use different frame numbers per trial:
  frame_table <- data.frame(trial = c('a', 'b'), frame = c(5000, 10000))
  set_start_frame(Guppies, tab = frame_table)$tr
  # Since some frames were fropper,