This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

Reciprocal Condition

Compute reciprocal condition of square matrix in 1-norm


Math Functions / Matrices and Linear Algebra / Matrix Operations



The Reciprocal Condition block computes the reciprocal of the condition number for a square input matrix A.

y = rcond(A)					% Equivalent MATLAB code



where κ is the condition number (κ ≥ 1), and y is the scalar output (0 ≤ y < 1).

The matrix 1-norm, A1, is the maximum column-sum in the M-by-M matrix A.


For a 3-by-3 matrix:


Golub, G. H., and C. F. Van Loan. Matrix Computations. 3rd ed. Baltimore, MD: Johns Hopkins University Press, 1996.

Supported Data Types

  • Double-precision floating point

  • Single-precision floating point

See Also

Matrix 1-NormDSP System Toolbox
NormalizationDSP System Toolbox

Introduced before R2006a

Was this topic helpful?