Adxl 335 + arduino + matlab

I am working on a project of connecting an ADXL335 Accelerometer to an Arduino UNO then reading the data in Matlab. So far whenever a reading matlab only show data X-axis.? i hope someone can help

Here is my code :

clear

clc

serialPort = "COM4";

a=arduino();

plotTitle = 'Position AXDL'; % plot title

xLabel = 'Time (s)'; % x-axis label

yLabel = 'Angle (C)'; % y-axis label

legend1 = 'X-Angle';

legend2 = 'Y-Angle';

legend3 = 'Z-angle';

yMax = 180; %y Maximum Value

yMin = -180; %y minimum Value

plotGrid = 'off'; % 'off' to turn off grid

min = -30; % set y-min

max = 30; % set y-max

delay = .01;

time = 0;

data = 0;

data1 = 0;

data2 = 0;

count = 0;

plotGraph = plot(time,data,'-r' ); % every AnalogRead needs to be on its own Plotgraph

hold on %hold on makes sure all of the channels are plotted

plotGraph1 = plot(time,data1,'-b');

plotGraph2 = plot(time, data2,'-g' );

title(plotTitle,'FontSize',15);

xlabel(xLabel,'FontSize',15);

ylabel(yLabel,'FontSize',15);

legend(legend1,legend2,legend3)

axis([yMin yMax min max]);

grid(plotGrid);

tic

while (toc<50) %Loop when Plot is Active will run until plot is closed

vx=readVoltage(a,'A0');

vy=readVoltage(a,'A1');

vz=readVoltage(a,'A2');

[angleX,angleY,angleZ]=VA(vx,vy,vz);

count = count + 1;

time(count) = toc;

data(count) = angleX(1);

data1(count) = angleY(1);

data2(count) = angleZ(1);

%This is the magic code

%Using plot will slow down the sampling time.. At times to over 20

%seconds per sample!

set(plotGraph,'XData',time,'YData',data);

%set(plotGraph1,'XData',time,'YData',data1);

%set(plotGraph2,'XData',time,'YData',data2);

axis([0 time(count) min max]);

%Update the graph

pause(delay);

end

[Eduard Castells]

Line 37, what is VA? I am getting an error