并且修改约束上限后 x2的值会随之改变

x=sdpvar(2,1)
Linear matrix variable 2x1 (full, real, 2 variables)
Coeffiecient range: 1 to 1
>> c=[1<=x<=6]
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
| ID| Constraint| Coefficient range|
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
| #1| Element-wise inequality 4x1| 1 to 6|
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> optimize(c,x)
~ 0: obj = 1.000000000e+000 infeas = 0.000e+000
~ 0: obj = 1.000000000e+000 infeas = 0.000e+000
ans =
yalmiptime: 1.0702
solvertime: [0.1600 7.6240e-04]
info: 'Successfully solved (GLPK-GLPKMEX-CC)'
problem: [0 0]
dimacs: [6x2 double]
yalmipmodel: [1x1 struct]
>> double(x)
ans =
1
1