Pacing insight (as a field) and chart with calculated value

1

I kind of have two questions in one post:

  • How would I be able to gain insight in the negative/positive pacing on a lap level with a field? (kind of similar to decoupling: (average speed 1st half)/(average speed 2nd half) )

  • Would it be possible to create a chart with a custom/calculated value/data stream. Specifically looking to visualize distance per stroke over time, but would be applicable in more scenarios I figure.

Thanks in advance for the help on either of them.

2

For the first one you could probably create a computed activity field with a script to do that. This would also work as a custom interval field. You can get the velocity_smooth stream and work with that:

{
  let velocity = streams.get("velocity_smooth").data
  
  function avgVelocity(start, end) {
    let tot = 0
    let c = 0
    for (let i = start; i < end; i++) {
      let v = velocity[i]
      if (v) {
        tot += v
        ++c
      }
    }
    return c ? tot / c : null
  }
  
  let mid = Math.floor((interval.start_index + interval.end_index) / 2)
  let first = avgVelocity(interval.start_index, mid)
  let second = avgVelocity(mid, interval.end_index)
  second ? first/second : null
}

Not yet but that is high up on the todo list. Also creating such streams from messages in the fit file.

1 Like
3

Thank you for the help!

I’ll try the script on my activities.

I can kind of figure out what’s happening in the example you provided, but is there any documentation or recourse for my future questions?

4

Not too much unfortunately. That link above and these:

A good resource is to search for other people’s stuff and look at their scripts.