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How to upload an array of numbers to a single field in Thingspeak?

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Mostafa Ibrahim
Mostafa Ibrahim on 10 Dec 2020
I'm trying to upload data to a field in my ThingSpeak channel. So far I have been able to upload a single number to the field. But when I tried to upload array like x = [1,2,3,4] it would give me this error: "'Values' must be a scalar, a 1-by-n numeric vector, or a cell array and must have the same dimensions as the 'Fields' value."
I'm using thingspeakwrite function like this : thingSpeakWrite(id,'Fields',1,'Values',x,'WriteKey',apikey).

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Answers (2)

Walter Roberson
Walter Roberson on 10 Dec 2020
x = [1, 2, 3, 4];
thingSpeakWrite(id, 'Fields', length(x), 'Values', x, 'WriteKey', apikey)

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Mostafa Ibrahim
Mostafa Ibrahim on 10 Dec 2020
That didn't work either unfornutelly, says it needs to be a 1D cell array. Yea I think the problem when sending multiple values is that they don't each have their own time stamp.
Walter Roberson
Walter Roberson on 10 Dec 2020
You might have to use the timetable form. The examples seem to show one timestamp for each row of the array, and seem to imply that each column is sent to a different field.
Christopher Stapels
Christopher Stapels on 16 Dec 2020
I think Mostafa wants to write to one field? If so, then 'fields' is just the field number, its not a number of fields to write to unfortunately. To write to multiple fields, use 'Fields', [1 3 4 5],... to write to those four fields. (all with the same timestamp)
That said, Timetables are usually the easiest way to write multiple things as Walter says.

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Christopher Stapels
Christopher Stapels on 16 Dec 2020
Here is one possibility.
thingSpeakWrite(958725, 'Fields', 1, 'Values', join(string(x)), 'WriteKey', writeKey)
or
y = "[ 1 2 3 4]";
thingSpeakWrite(958725, 'Fields', 1, 'Values', y, 'WriteKey', writeKey)

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