MATLAB AND ARDUINO SERIAL COMMUNICATION

By changing the COM port in the code you can connect after clicking connect wait for few second and then it will works
ARDUINO CODE:
const int LED=13;
int NewValue;
void setup()
{
Serial.begin(9600);
pinMode(13, OUTPUT);
}
void loop()
{
if(Serial.available()>0)
{
NewValue=Serial.read();
if (NewValue == 100)
{
digitalWrite(LED, HIGH);

}
if(NewValue == 101)
{
digitalWrite(LED, LOW);
}
}
}