Why do I receive an "Array dimensions mismatch" in Stateflow

The following shows the C code that I am attempting to duplicate in Stateflow however I receive the error

SensorData = [1:56];

      for(j=0;j<MAT_SIZE;j++)
      {
      //if (i==j)
        
    result = result + (SensorData[i]-Mean[i])*SigmaInverse[i][j]*(SensorData[j] Mean[j]);  
      }
The attached image shows the for loop and the error in Stateflow. 
 Thanks,

Gary