An Improved Grasshopper Optimizer for Global Tasks

Table 1

Example of orthogonal table..

The serial number	The level of
	1	2	3
1	1	1	1
2	1	2	2
3	1	3	3
4	2	1	2
5	2	2	3
6	2	3	1
7	3	1	3
8	3	2	1
9	3	3	2