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condest | See Also |
1-norm matrix condition number estimate
c = condest(A) [c,v] = condest(A)
c = condest(A)
uses Higham's modification of Hager's method to estimate the condition number of a matrix. The computed c
is a lower bound for the condition of A
in the 1-norm.
[c,v] = condest(A)
estimates the condition number and also computes a vector v
such that .
Thus, v
is an approximate null vector of A
if c
is large.
This function handles both real and complex matrices. It is particularly useful for sparse matrices.
cond
Condition number with respect to inversion
normest
2-norm estimate