You can use the ThingSpeak Support Toolbox from desktop MATLAB to directly pull the data into MATLAB without having to go through a file. You can also use the same functions in MATLAB apps on ThingSpeak.
Using thingSpeakRead() in the ThingSpeak Support Toolbox is the easiest way.
If you do need to use the REST command to get channel information with webread, you can use the results parameter to increase the number of entries up to 8000
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