Question

matlab中max(norms,1e-10)是什么意思?其中norms是矩阵。

Answer 1

>> norms=randn(3,5)% 建立一个随机矩阵

norms =

-0.43256481152822 0.28767642035855 1.18916420165210 0.17463914282092 -0.58831654301419
-1.66558437823810 -1.14647135068146 -0.03763327659332 -0.18670857768144 2.18318581819710
0.12533230647483 1.19091546564300 0.32729236140865 0.72579054829330 -0.13639588308660

>> max(norms,1e-10)

ans =

0.00000000010000 0.28767642035855 1.18916420165210 0.17463914282092 0.00000000010000
0.00000000010000 0.00000000010000 0.00000000010000 0.00000000010000 2.18318581819710
0.12533230647483 1.19091546564300 0.32729236140865 0.72579054829330 0.00000000010000
原矩阵里的负数元素都变为 0.00000000010000 ，也就是1e-10
我是从MATLAB里试出来的，仅供参考吧，欢迎交流。