why im always getting this error . help !!!!! "Expression or statement is incorrect--possibly unbalanced (, {, or [."

    a = arduino('COM3','uno');

void step (boolean dir, byte dirPin, byte stepperPin, int steps)
{
    digitalWrite (dirPin,dir);
    delay (50);
    for(int i=0; i<steps;i++) 
    {
        digitalWrite (stepperPin, HIGH);
        delayMicroseconds (800);
        digitalWrite (stepperPin, LOW);
        delayMicroseconds (800);
    }
}

void setup () 
{  
    pinMode (X_DIR, OUTPUT);
    pinMode (X_STP, OUTPUT);
    pinMode (Y_DIR, OUTPUT); 
    pinMode (Y_STP, OUTPUT);
    pinMode (Z_DIR, OUTPUT);
    pinMode (Z_STP, OUTPUT);
    pinMode (EN, OUTPUT);
    digitalWrite (EN, LOW);
}

void loop ()
{
    step (false, X_DIR, X_STP, 200); 
    step (false, Y_DIR, Y_STP, 200); 
    step (false, Z_DIR, Z_STP, 200); 
    delay (1000);
    step (true, X_DIR, X_STP, 200); 
    step (true, Y_DIR, Y_STP, 200);
    step (true, Z_DIR, Z_STP, 200); 
    delay (1000);
}

[Madhu Govindarajan]

This looks like an arduino sketch and a MATLAB code at the same time. Could you tell us what you are trying to do and if you are using MATLAB support package for Arduino?

[SYED AFDAR]

Hello mr madhu. I want to control 3 Steppers motors. So that i will have x,y and z axis. I'm using a4988 pololu as my Stepper motor shield. My project is doing on cnc machine. I use this code to only move motor as testing . But the error always coming out. Btw one more question can i make matlab as interface where it read gcode and make the machine work it. I'm using pololu a4988 shield. Please help me