How do I read the last 3 Thinkspeak channel statuses into an array?

I am currently running a ThingSpeak Maltlab analysis that reads the latest channel status and acts on it. I am using this code, which works fine:

url='https://api.thingspeak.com/channels/mychan/feeds/last.json?api_key=mykey&status=true';
lastData=webread(url);
status = [lastData.status];

I am trying to figure out how to change this to read the last 3 channel statuses and put them into an array like status(i) where i goes from 1-3? This url returns the 3 statuses I want:

url = https:'//api.thingspeak.com/channels/mychan/status.json?api_key=mykey&results=3'

But I can't figure out how to get them into an array to work with. Does anyone know how to do this? Thanks.

[Image Analyst]

Does anything in the url change when you "read the last 3 channel"? Like mychan or something? Or do you call the same URL, just in a loop after a time delay? Like

for timePoint = 1 : 3
    lastData=webread(url);
    status(timePoint) = lastData.status;
    pause(2); % Pause 2 seconds.
end

What is the lastData variable? What does this show

lastData
whos lastData

[Chris]

No, the channel and the key are identical. Here are the results I get if I use those urls in a browser (first for the last status, then for the last 3):

{

"created_at": "2025-05-09T14:07:20Z",

"entry_id": 1998612,

"field1": "-0.04087",

"field2": "506",

"field3": "0",

"field4": "0",

"field5": "1008",

"field6": "0",

"field7": "464",

"field8": "0",

"status": "000000"

}

When querried for last 3 statuses:

{

"channel": {

"name": "Boiler 2",

"latitude": "4x,xx",

"longitude": "-7x.xx",

"elevation": "11"

},

"feeds": [

{

"created_at": "2025-05-09T14:07:35Z",

"entry_id": 1998613,

"status": "000000"

},

{

"created_at": "2025-05-09T14:09:35Z",

"entry_id": 1998614,

"status": "000000"

},

{

"created_at": "2025-05-09T14:11:35Z",

"entry_id": 1998615,

"status": "000000"

}

]

}

Answer 1

[Christopher Stapels]

url = 'https://api.thingspeak.com/channels/mychan/status.json?api_key=mykey&results=3';

data = webread(url);

statusArray = {data.feeds.status};

Gives you a cell array of statuses (statusi?) :).

Full Disclosure: I did use a little Gen AI to help me on this one.

[Chris]

Perfect! Thanks so much. I figured it had to be something simple like that, (but couldn't get AI to help me.)

[Christopher Stapels]

Have you tried the MATLAB AI Chat playground? Its uses MATLAB documentation, so it tends to be a little more focused on the MATLAB language.

[Chris]

No, just Google's AI. I'll have to check this one out; I wasn't aware of it. Thanks again.