A vector is magnitude but also direction, you will need some more calculations. Using vec_accelerate its a possibility, change the target vector (0,0,0) to the vector you want to move and test it.

Code:

var vSpeed;
var vTarget[3] = 0,0,0;
var distBetweenObjTarget[3];

action testObj
{   
   var vAccel;   
   var vMove;   
   var iSpeed = 2;   
   while(1)   
   {      
      //turn towards target      
      vec_set(temp,vTarget.x);       
      vec_sub(temp,my.x);      
      vec_to_angle(my.pan,temp);       
      //calculate distance between obj and target      
      distBetweenObjTarget = vec_dist(my.x,target.x);       
      //calculate velocity to apply      
      vAccel.x = iSpeed * distBetweenObjTarget[0];       
      vAccel.y = iSpeed * distBetweenObjTarget[1];
      vAccel.z = iSpeed * distBetweenObjTarget[2];
      vec_accelerate(vMove, vSpeed, vAccel, 0.5);
      c_move(my, vMove, nullvector, glide);      
      wait(1);      
   }
}


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