Sending serial data to Arduino from Matlab(not using support package) I am learning Arduino and trying to understand how integers and strings are sent across the serial port. 
I tried a small program in arduino which reads a number as a string and tries to blink led 13 according to that number. Below is the arduino side of code.

const int ledpin = 13;
int value = 0;
int blinkrate;
void setup()
{
   Serial.begin(9600);
   pinMode(ledpin,OUTPUT);

}

void loop()
{
    if (Serial.available())
      {
         char ch = Serial.read();
         if (isDigit(ch))
            {
               value = (value*10) + (ch - '0');
            }
         else if (ch == 10)
            {
               blinkrate = value;
               Serial.println(blinkrate);
               value = 0;
            }
      }
    blinkled(blinkrate);
}

void blinkled(int blinkrate)
 {
   digitalWrite(ledpin,HIGH);
   delay(blinkrate);
   digitalWrite(ledpin,LOW);
   delay(blinkrate);
 }


When i try to send a string from MATLAB, the RX led blinks once indicating something is coming, but the LED on pin 13 is not behaving accordingly(it should blink according to the number i send). Here is the matlab side of code.

pre_open = instrfindall;
delete(pre_open);
serial_port = serial('COM3');
set(serial_port,'Terminator','CR');
set(serial_port,'BaudRate',9600);
set(serial_port,'DataBits',8);
set(serial_port,'StopBits',1);
set(serial_port,'Parity','none');
fopen(serial_port);
num = 200;
fwrite(serial_port,int2str(num));
data = fscanf(serial_port,'%d');
pause(2);
fclose(serial_port);


When i try to read the return string from arduino, MATLAB shows me a timeout error.

I would be grateful if anybody points me to the right solution.
Thank you.
Got it, instead of depending on the Serial object, i sent the line feed to arduino. All this time it has been waiting for the Line feed that never arrived.

delete(instrfindall)
s = serial('COM3', 'BaudRate', 9600); %38400
fopen(s);
pause(0.1);
text = input('enter','s');
fprintf(s,'%s\n',text,'sync');
pause(0.1);
d = fscanf(s,'%s');
pause(0.1);
delete(instrfindall)