Average 3 fields and dynamic update | MATLAB IoT Analytics | Forum

Here is the basic outline.  Create a MATLAB analysis that does something like this:

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Temp1 = thingSpeakRead ...
Temp2 = thingSpeakRead ...
Temp3 = thingSpeakRead ...

allTemp = [Temp1,Temp2,Temp3];

meanTemp = mean(allTemp);

chID = xxxxx; % Your channel ID for the mean temp

% Write the mean to a new channel

thingSpeakWrite(chId,meanTemp);

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To "automatically trigger a refresh based on data that is being updated/sent to ThingSpeak" use the React App to run your MATLAB analysis on insert of your data (assuming you can reliably use one of you three temp readings to trigger with the other two already updated).  If React timing is an issue then try the TimeControl App.