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regexp help when comparing strings
The function regexpi needs the second argument expression must be a regular expression! About what is regular expression, you c...

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Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 7.252760e-17.
It seems that A-lamda*eye(n) is nearly singular, you should check it carefully! mabey you can use another computing method.

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