Arduino erros using Matlab. (Use Matlab like Monitor Serial)

Hi, I trying to control one Arduino system and read their output data, just like the monitor serial from the Arduino IDE. I read a little about it, but I only find how to set some outputs signals and/or read some digital outputs. I trying something but it always comes to this message and I can only read the first message that would come in the serial monitor. 'Warning: Unsuccessful read: A timeout occurred before the Terminator was reached..'

s = serial('COM11')
set(s,'BaudRate', 115200)
fopen(s)
out = fscanf(s)
z=1;
while (z==1) 
           dat = fscanf(s); 
           fwrite(s,1);
           fscanf(s);    
end

It's one way that the Matlab works like the serial monitor, I mean, that I can read e write information instantly? I like to use Matlab because sometimes I would like to use some loops and it would be impossible to do automatic in serial monitor from Arduino IDE.

Thanks, everybody.

[Walter Roberson]

Are you certain that you want to write a binary floating point double precision 1.0 to the device, but you expect to receive text numbers in response?

[Szillat]

Yes, In my Arduino code, for example, when I write in monitor serial: 1 comes: Object 1: 0 then, if I put 100 the monitor serial give-me: Object 1: 100.

It's that what you mean?

[Walter Roberson]

Please experiment with changing fwrite(s,1) to fprintf(s,'1\n')

[Szillat]

it works, thanks.