1樓：
Generally speaking, a condition number nearly 1 should be good-conditioned,
anddetermine the condition number of the coefficient matrix (the matrix on the left side of the backslash (\) or on the right side of the forward slash (/) using the COND function. Large results for the condition number indicate the matrix is extremely ill-conditioned.
Testing singularity using abs(det(X)) <= tolerance is not recommended as it is difficult to choose the correct tolerance. The functioncond(X) can check for singular and nearly singular matrices.
Values of cond(X) and cond(X,p) near 1 indicate a well-conditioned matrix.
References:
Matrix determinant
Condition number with respect to inversion
Why do I get warning message 'Matrix is close to singular or badly scaled. ' ?
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