I would like to have GAP per lap, and while we’re at it, GAP for the activity.
I created a custom stream, and used it to create a graph and an activity field (total elevation RUNN).
As I said in earlier posts, when I’m doing uphill intervalls on the treadmill, I would like to be able to see the end results in intervals.
Why not calculate a GAP stream from speed and incline?
Then you can plot GAP as any other chart and use a custom field on the activity data page and in the interval headers.
I’m open to anything, really. It’s the know-how I’m lacking. If you would be kind enough to give me a few pointers, I’m ready to try and get to it.
I really don’t understand your script. If you want to calculate an interval field from your custom streams do something like this:
{
function calculateGAP(pace, incline) {
return pace * (1 + 0.0075 * incline);
}
const pace = icu.streams.Enhanced_speed;
const incline = icu.streams.RUNNincline;
let totalEnhanced_speed = 0;
let totalinclineRunn = 0;
let count = 0;
for (let i = interval.start_index; i < interval.end_index; i++)
{
totalEnhanced_speed += pace[i];
totalinclineRunn += incline[i];
count++;
}
lapGAP = calculateGAP(totalEnhanced_speed/count, totalinclineRunn/count);
}
In this example I assume you have two streams “Enhanced_speed” and “RUNNincline”. It will calculate the GAP for each interval.
That is very helpful. Thank you for your work and patience.
I get this error when I copy your script : TypeError: Cannot read property “0” from null
Do you know what could cause that?
Probably one or all the (custom) streams (stream name) doesn’t exist. Check the name. It should match your name of your custom streams (the code name). I have assumed, you have created two streams. One with Code name “Enhanced_speed” and one with “RUNNincline”.
But this is just guessing, as I don’t know what you have created so far. It would help, if you show what you have created. For me it’s not clear, if it’s a interval field, activity field or stream.
Here is the list of what I’ve done, but just before, enchanced_speed is a garmin fit file field, which is in m/s, and is the one used by intervals.icu as far as I can tell. So I have not created anything related to that.
Sidenote : My interface is in french, and I’m trying to translate/guess to the exact naming convention, so sorry if it is a bit unclear. I’m really trying here.
I created an activity filed named Total Elevation RUNN, wich only calls for the total_ascent (m) fit file field.
I created custom stream, named RUNN incline, the code is RUNNincline and it comes from the inclineRunn fit field. No script here either.
I then created an activity graph, wich I don’t think really matter in this discussion. Just showing RUNN incline over time.
And as I said previously, I would like to have GAP per lap, and while we’re at it, GAP for the activity.
Does that help?
I don’t have a Garmin, so was hard to understand. But I think I understand now. I would create another custom stream with Enhanced Speed:
And change the script to this, change the stream names to your “Code” name:
{
function calculateGAP(pace, incline) {
return pace * (1 + 0.0075 * incline);
}
const pace = icu.streams.EnhancedSpeed;
const incline = icu.streams.RUNNincline;
let totalEnhanced_speed = 0;
let totalinclineRunn = 0;
let count = 0;
for (let i = interval.start_index; i < interval.end_index; i++)
{
totalEnhanced_speed += pace[i];
totalinclineRunn += incline[i];
count++;
}
lapGAP = calculateGAP(totalEnhanced_speed/count, totalinclineRunn/count);
}
Hope it helps 
Thought you would calculate your GAP, so you should change the unit.
For me it’s working with grade_smooth and velocity_smooth
Genius! It was indeed an error on my side. Thanks for you work.
Using what you’re teaching (hey, I’m trying, I swear!), I added a condition that if cadence is too low, then GAP is 0. And everything works well.
This forum is truly awesome.
