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Hello, I'm new to thingspeak, i want to combine 4 fields in one chart, i have used the code below

readChannelID = 1408944; % YOUR CHANNEL NUMBER
fieldID1 = 1; % YOUR FIELD NUMBER ie 1 to 8
fieldID2 = 3; % my case 1 Temp 2 Humid
readAPIKey = '19EJIJW6YBM7VS7N';
[data1, time1] = thingSpeakRead(readChannelID, 'Field',fieldID1,'NumDays',1,'ReadKey', readAPIKey);
[data2,time2] = thingSpeakRead(readChannelID, 'Field',fieldID2,'NumDays',1,'ReadKey', readAPIKey);
thingSpeakPlotYY(time1, data1, time2, data2,...
'YGrid1','on','YLabel1','% H.R.',...
'YLabel2','*C','XLabel','Fecha y hora',...
'Title','Tempix y Humix ultimas 24 horas');

However, an error occurs saying that the function thingSpeakPlotYY is unrecognized