[SOLVED] Custom Stream weirdness (division by zero)

[Kristopher_Dick]

I’m trying to add a speed/watts stream. I found the fields I need, and independently I get a chart for the whole activity, but I only get a chart for the first few minutes when either is divided by the other.

code follows:

{
  let speed = icu.streams.velocity_smooth
  let watts = icu.streams.fixed_watts
  for (let i = 0; i < data.length; i++) {
    //data[i] = watts[i]  / speed[i]
    data[i] = speed[i] / watts[i]
    //data[i] = speed[i]
    //data[i] = watts[i]
  }
}

[Nik_Om_Cinderella_Ri]

Division by zero perhaps?

[Kristopher_Dick]

Thanks, but that seems unlikely given the attached charts.

[app4g]

perhaps just try filtering out zeros? even if it seems unlikely from the charts.

I just copied your text on one of my activities

[david]

It is very likely division by zero. Try:

data[i] = watts[i] ? speed[i] / watts[i] : 0

That sorted it out for my own test.

[miguell]

Thank you David for pointing this , just change my Run Effectiveness Activity Steams accordingly.

[Kristopher_Dick]

Thanks. Not sure how many hundreds of times I’ll need to learn the lesson to protect my formulae from the data I’m feeding them.

[miguell]

How true. Thank you Kristopher, for pointing weirdness (division by zero) in my scripts. Running Effectiveness (RE) formulas by Dr. A. Coggan.