matlab built-in vs. for loop example in MATLAB101

[CYS-physics]

it is not significant issue, but the efficiency of using matlab Built-in compared to for loop (line 288~306 in MATLAB101 file) does not show dramatic difference by just using the default matrix size. And sometimes even shows that for loop is better.
instead, if we increase A and B, matlab built in outperforms for loop by some digits.
so i suggest to use bigger matrix size in this tutorial

Best,
Yunsik