Matlab to Arduino Communication with Array

Hello Everybody, I haven't seen to many answers to this question, but I can't get anything to work between my Arduino and matlab code when I want to send an array. Sending a single value is fine, but sending many values is very difficult. Below are my codes. I can't seem to figure anything out, and my personal opinion is that the For loop in arduino code is the incorrect way to read the array. Any and all help is very much appreciated! (PS: Some of the stuff in the arduino code is for setting a DAC to do electric signals. The link for this part can be found here: https://learn.adafruit.com/mcp4725-12-bit-dac-tutorial?view=all)

Matlab Code:

 clear all
 clc

 output = [1,2,1];
 data = char(output);

 s = serial('COM4','BaudRate',9600);
 fopen(s);
 fprintf(s,'%d',data);
 fclose(s);

Arduino Code:

 #include <Wire.h>
 #include <Adafruit_MCP4725.h>
 Adafruit_MCP4725 dac;

 int ledPin=13;
 int i;
 char matlabData;
 char arduinovalue[3];

 void setup() {
   pinMode(ledPin,OUTPUT);
   Serial.begin(9600);
   dac.begin(0x62);
 }

 void loop() {  
    int uge = sizeof( arduinovalue ) / sizeof( int );  
    if (Serial.available() > 0) {
     for (i = 0; i < uge; i++){
       arduinovalue[i] = Serial.read();
     }
    }
    else{
     for (i = 0; i < uge; i++){
       arduinovalue[i] = 0;
     }
    }
    for (i = 0; i < uge; i++){
       if(arduinovalue[i]==1){
          digitalWrite(ledPin,HIGH); // turn light on
          dac.setVoltage(0, false);
         }
       else if(arduinovalue[i]==2){
          digitalWrite(ledPin,LOW); // turn light off  
          dac.setVoltage(4095, false);
       }  
     }
 }