Plotting custom Power Frequency Distribution Chart for activities

Feature Requests
1

Hello

I would like to plot a Power Frequency Distribution Chart similar to what Allen, Coggan, and Mcgregor (3rd Edition) show on page 28 in Fig. 3.1

Intervals.icu does some like this already but I need smaller Intervals for the bars (e.g. steps for 5W, 10W etc.).

image
image1104×442 8.34 KB

A script to create a custom chart would be highly appreciated.

2

Here is a start. It assumes your data has 1 second per point and uses a 5 second moving average of power (power data is spikey). Intervals.icu calculates these things on an interpolated power stream with 1 second per tick. I need to make that available to scripts to do this properly.

{
  let watts = icu.streams.fixed_watts
  let maxWatts = 0
  for (let w of watts) if (w > maxWatts) maxWatts = w
  let bucketSize = 5
  let buckets = []
  let x = []
  for (let i = 0; i <= (maxWatts / bucketSize); i++) {
    buckets.push(0)
    x.push(i * bucketSize)
  }
  let totWatts = 0
  let window = 5  
  for (let i = 0; i < window; i++) if (watts[i]) totWatts += watts[i]
  for (let i = window; i < watts.length; i++) {
    let w = totWatts / window
    let bucket = Math.floor(w / bucketSize)
    buckets[bucket] += w
    if (watts[i]) totWatts += watts[i]
    if (watts[i - window]) totWatts -= watts[i - window]
  }  
  
  let data = [
    {
      x: x,
      y: buckets,
      type: 'bar',
      marker: {
        color: '#63c',
        opacity: 0.7
      }
    }
  ]

  let layout = {
    title: {
      text: "Time in " + bucketSize + "w buckets"
    },
    margin: {
      l: 30,
      r: 20,
      t: 20,
      b: 30
    }
  }

  chart = { data, layout }
}