Use arduino as DAQ (increase sample rate)

[jamed]

Hi

i want to use arduino as USB-DAQ and read it by matlab
i achieved that, by using this code in arduino:

int valor = 0; 
int analogin = A2; 


void setup(){

Serial.begin(9600); 
}

void loop(){

valor = analogRead(analogin);
Serial.println(valor); 

delay(100);

}

but the problem in this method is: the max sample rate in this method is 1000 sample per second,because the minimum delay is 1 millisecond

so i want a method to increase the sample rate to 4000 sample per second
how can i do that?