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ThingSpeak data tips Matlab Visualization Plot

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Michael Gacsaly
Michael Gacsaly on 27 Mar 2021 at 20:25
Answered: Christopher Stapels on 29 Mar 2021 at 20:46
I want to create a ThingSpeak Matlab Visualization Plot with data tips (similar to the defaut ThingSpeak plot visualization).
When I enable this with after tge plot with:
dcm = datacursormode;
dcm.enable = "on";
I get data tips that say how long ago the plot was updated ("seconds ago").
So I tried to define an update function (from an example). But that did not help.
Seeing the Matlab code that generates the default ThingSpeak plot would likely answer my question...but I could not find it.
dcm.UpdateFcn = @displayCoordinates;
function txt = displayCoordinates(~, info)
txt = {sprintf('X: %.5f', info.Position(1)), sprintf('Y: %.5f', info.Position(2))};
end

Accepted Answer

Christopher Stapels
Christopher Stapels on 29 Mar 2021 at 20:46
Some of the features of ThingSpeak field plots are not available on custom visualizations.
Interactive plots from custom visualizations are not presently available.
You can create a custom visualization that provides the last update text on the plot itself at the time the plot was generated (not at mouse hover time)
It is possible to create interactive plots with ThingSpeak data in MATLAB Online or MATLAB desktop. Here is a video that shows how you can generate an IoT data explorer app in MATLAB.

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