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´íÎóʹÓà lqr (line 43)
The "lqr" command failed to stabilize the plant or find an optimal feedback gain. To remedy this problem:
1. Make sure that all unstable poles of A are controllable through B (use MINREAL to check)
2. Modify the weights Q and R to make [Q N;N' R] positive definite (use EIG to check positivity).

³ö´í empc_coal (line 103)
  [K,P,r] = lqr(AA1,BB1,Wx,Wu);


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