Any way to subset data from a single Channel (Eg. using thingspeakread) in a MATLAB Visualisation?

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N S
N S 2020-12-29
评论： Cris LaPierre 2020-12-29
Any pointers would be appreciated - I've been looking for a way to do this for hours now.
I have a single channel receiving data from multiple IOT devices including the device name (this is working just fine).
I'd like to plot a value (eg Temperature) over time by device on a single chart.
The bit I can't seem to do is find a way to retrieve data "Where DeviceID = xyz"
Any ideas please??

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回答（1 个）

Cris LaPierre
Cris LaPierre 2020-12-29
If you have all the data in a single matrix, then the plot function will treat each column as a separate series. Does this get you what you want?
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N S
N S 2020-12-29
Hi - I haven't started to create anything yet as I couldn't find a way to do the subset of data as I need to.
The data is pretty simple, just a numeric value by date/time. Approx 1 data point per device per minute, somewhere around 10 devices eventually. Does that help?

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