Howto use "smoothItem(itemIdx, [smoothRange])"?

[Freemann]

I moving some lua scripting to dzVents and while reading the docs I found "smoothItem(itemIdx, [smoothRange])" but have no idea how to use it.

Here's my dzVents script;

Code: Select all

-- Check the wiki at
-- http://www.domoticz.com/wiki/%27dzVents%27:_next_generation_LUA_scripting
return {
	-- 'active' controls if this entire script is considered or not
	active = true, -- set to false to disable this script
	-- trigger
	-- can be a combination:
	on = {devices = {'DummyTest'},timer = {}},
    data = {
            achtertuinRaamLux = { history = true, maxItems = 10 }
    },
	-- actual event code
	-- in case of a timer event or security event, device == nil
	execute = function(domoticz, device)
	    domoticz.data.achtertuinRaamLux.add(domoticz.devices('AchtertuinRaamLux').lux)
	    -- how further with 'smoothItem(itemIdx, [smoothRange])' ?
	end
}

Many thanks in advance and maybe someone could add some example code to the tutorial/docs

[dannybloe]

Well you build up a history of lux readings. At some point you want to do queries on those readings. So you could get the latest/youngest value or perhaps the 5th reading from now in the past . Then you will get the exact value that you've put into the history.

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local lux5=domoticz.data.achtertuinRaamLux.get(5) 

But you can also get the smoothed value at that 5th location in time which is an average over a few readings before and a few readings after the 5th item. You do this to average out fluctuations in your readings.

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local lux5smoothed = domoticz.data.achtertuinRaamLux.smoothItem(5, 2)

In this case you average the reading at indx 3,4,5,6 and 7 (2 around 5th item).

Note that idx=1 is the youngest reading.

[Freemann]

ok thanx!

Seeying the following table and chart i'm wondering how to get such data table/chart.
https://www.domoticz.com/wiki/index.php ... _smoothing

Is there some sort of example how to do this?

[dannybloe]

Excel

[Freemann]

Excel

thanks for you constructive answer!

The smoothItem() and the docs suggest that it, under the hood, generates an lua table (which can be printed with domoticz.log() ) with data points.
If so, how to get these datapoinst.
If not, how could I build such a table with this function.

[dannybloe]

That easy!

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domoticz.data.myHistory.forEach(function(item,index)
    local s=domoticz.data.myHistory.smoothItem(index, 3)
    domoticz.log(item.data .. ', ' .. s)
 end)

Something like that.