Thingspeakwrite error when using string array

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Dion Guek
Dion Guek 2017-11-13
评论： Christopher Stapels 2024-6-4
This string of code is taken from the thingSpeak documentation for matlab. I just copy and paste but still got this error. I would very much appreciate it if anyone can tell me where i did wrong
  2 个评论
Geoff Hayes
Geoff Hayes 2017-11-13
Dion - which version of MATLAB are you using? If you type doc thingSpeakWrite what does the documentation say about the data (second) input (are strings allowed)?
Dion Guek
Dion Guek 2017-11-13
编辑：Jan 2017-11-13
My matlab version is 2017b student edition. Based on the attached picture above, the data can be a string. This is taken from the doumentation page from https://www.mathworks.com/help/thingspeak/thingspeakwrite.html

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Christopher Stapels
Christopher Stapels 2017-12-20
编辑：Christopher Stapels 2017-12-20
When you write string data to ThingSpeak, it generally wants to have a cell array. You should not usually need to do the String() conversion yourself. Try
thingSpeakWrite(349672,{ans},'Location',[-40,23],'WriteKey',writeKey);
and
thingSpeakWrite(channelID,{2.3,'on','good'},'Location',[-40,23],'WriteKey',writeKey);
Ill have a look at fixing that documented example, thanks for pointing it out.
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Marc Hanssens
Marc Hanssens 2024-6-4
what about with arrays? EG: dA,dB & dC are arrays of Doubles and sD is an array of strings
thingSpeakWrite(writeChannelID,'Fields',[1,2,3,4],'Values', [ dA, dB, dC, sD ], 'WriteKey', writeAPIKey, 'TimeStamp',tStamp);
Christopher Stapels
Christopher Stapels 2024-6-4
Generally, the field values cannot be arrays. You can write them as strings or cell arrays.
thingSpeakWrite(writeChannelID,'Fields',[1,2,3,4],'Values', [ {dA}, {dB}, {dC}, {sD} ], ...
'WriteKey', writeAPIKey, 'TimeStamp',tStamp);

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