Let's say you know how long of a vector you need, then use indexing.
Example -
for i = 1:100
data(i) = readVoltage(a,'A9');
pause(0.1);
end
Note the pause just pauses MATLAB and you might notice that the whole thing takes more than 10 seconds.
If you want to collect data till you press a pushbutton on the Arduino.
buttonPressed = false;
data = readVoltage(a,'A9');
while ~buttonPressed
data(end+1) = readVoltage(a,'A9');
buttonPressed = readDigitalPin(a,'D13'); % Here it is assumed that you have a push button connected to Pin 13.
pause(0.1);
end
