if (i != (internalSizeRows-1)) { returnString += "\n"; }
    public String toString() {	checkRep();	String returnString = "[";	// for each row	for (int i=0; i<internalSizeRows; i++) {	    returnString += "[";	    // for each column	    for (int j=0; j<internalSizeCols; j++) {		// stick the value of the matrix onto this line		returnString += this.internalMatrix[i][j];		// don't add a space if this is the last element in the column		if (j != (internalSizeCols-1)) {		    returnString += " ";		}	    }	    returnString += "]";	}	returnString += "]";	return returnString;    }