Datafield 3S Power

If you just want three second average power, you can store the last three power values and average them. I'm just throwing this code out there, it may not be perfect..

class XDataField extends Ui.SimpleDataField
{
hidden var _M_samples;

function initialize(seconds) {
SimpleDataField.initialize();
_M_samples = new [seconds];
_M_index = 0;
_M_count = 0;
}

function compute(info) {
if (info.currentPower == null) {
return null;
}

_M_samples[_M_index] = info.currentPower;
_M_index = (_M_index + 1) % _M_samples.size();

if (_M_samples.size() != _M_count) {
_M_count += 1;
}

var sum = 0.0;
for (var i = 0; i < _M_count; ++i) {
sum += _M_samples;
}

return (sum / _M_count).toNumber();
}
}
[/code]

I think the following is another reasonable way to implement it, but it is a filtered value (it won't change as quickly as the one above).

class XDataField extends Ui.SimpleDataField
{
hidden var _M_seconds;
hidden var _M_average;

function initialize(seconds) {
SimpleDataField.initialize();
_M_seconds = seconds;
}

function compute(info) {
if (info.currentPower == null) {
return null;
}

if (_M_average == null) {
_M_average = info.currentPower;
}
else {
_M_average = (_M_average + _M_average + info.currentPower) / 3.0;
}

return _M_average.toNumber();
}
}


Travis

This is really helpful, thank you very much!