Question by Jaehyuk Professor I have a question about simpson rule. If there are even data, by using $x_{n+\frac{1}{2}}$ we can modify the number of data points into odd number. Is this the right way to use Simpson Rule?
 Question by Student 201427128 professor, I have question about finding L and U. using LU decomposition, I think there are two way to find U. (1)using gaussian elimination. (2)mutiply A by $m_{1,2,...}$like $P_{23}m_1P_{12}A$. I know that using gaussian elimination takes W(operation count) but way(2) is just ($matrix*matrix$). Is it takes W(operation count)?. In the previous question, you say that multipling with P(partial pivoting) isn't takes W. Does that apply here? I am confused.
Your questions are not clear to me. To find $U$, we do not perform Gaussian elimination. Gaussian elimination is when solving $AX=B$ with $A$ given and without going through $L$ and $U$ matrices.
 Question by Student 201427128 Professor, I understand your comment. but I still don't know that Calculate W(operation counting) about $P_{23}m_1P_{12}A$. when I count $P_{23}m_1P_{12}A$,because Partial pivotiong isn't count. Do I just count $m_1A$?
 $\pi$