Plotting force sensor data from Arduino in matlab

Hi,

I'm trying to plot live data from a force sensor resistor in matlab using an arduino. I'm using the code I found on mathworks, but I cannot figure out how to adapt it correctly for it to read voltage data.

I need the command a=arduino; b = readVoltage(a,'A0');

But than I'm struggling with the fread function, since the fread function should than read the voltage, but this gives me the error 'In an assignment A(:) = B, the number of elements in A and B must be the same'

when I put data(i) = fread(b);

s = serial('COM3');

s.InputBufferSize = 1; % read only one byte every time

try

    fopen(s);

catch err

    fclose(instrfind);

    error('Make sure you select the correct COM Port where the Arduino is connected.');

end

%% Create a figure window to monitor the live data

Tmax = 1000; % Total time for data collection (s) figure,

grid on,

xlabel ('Time (s)'), ylabel('Voltage'),

axis([0 Tmax+1 0 200]),

%% Read and plot the data from Arduino

Ts = 1; % Sampling time (s)

i = 0;

data = 0;

t = 0;

tic % Start timer

while toc <= Tmax

    i = i + 1;

    %%Read buffer data

    data(i) = fread(s);

    %%Read time stamp

    % If reading faster than sampling rate, force sampling time.

    % If reading slower than sampling rate, nothing can be done. Consider decreasing the set sampling time Ts

    t(i) = toc;

    if i > 1

        T = toc - t(i-1);

        while T < Ts

            T = toc - t(i-1);

        end

    end

    t(i) = toc;

    %%Plot live data

    if i > 1

        line([t(i-1) t(i)],[data(i-1) data(i)])

        drawnow

    end

end

fclose(s);

I hope my question is clear. Thanks in advance