Read Arduino data (Matlab code)

%Delete previous connections
delete(instrfind({'Port'},{'/dev/tty.usbmodem621'}));
%Create a serial connection
s = serial('/dev/tty.usbmodem621','BaudRate',9600,'Terminator','CR/LF');
warning('off','MATLAB:serial:fscanf:unsuccessfulRead');
%Open Port
fopen(s);
%Initialize the variables
Nvalues=100; %Number of values ​​we want to read
m1=zeros(1,Nvalues);
i=1;
k=0;

while k<Nvalues
%Read the serial port
a = fscanf(s,'%f.%f')';
m1(i)=a(1);
%Draw the figure
figure(1);
plot(m1);
%Increment the counter
i=i+1;
k=k+1;
end