Serial Communication between arduino uno and matlab?

I am trying to open folder('C:') with serial communication via Arduino Uno. Can anyone tell me what is the problem in code? Code am using is:

s=serial('COM4');
fopen(s);
tic
    while (toc<1)
    A=fscanf(s);
    if ( A == '1')
           winopen('C:')
    end
end
fclose(s);
delete(s);

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/matlab/ref/serial.fscanf.html#zmw57dd0e272866

If you want to read one byte at a time you should use fread() instead of fscanf

A = fread(s, 1, 'char');