English 한국어 中文

 -- Built-in Function:  ctranspose (X)

     Return the complex conjugate transpose of X.



     This function and x' are equivalent.



     See also: transpose.






A =

   1   2
   3   4

ans =

   1   3
   2   4

 -- Built-in Function:  ctranspose (X)

     Return the complex conjugate transpose of X.



     This function and x' are equivalent.



     See also: transpose.

 -- Built-in Function:  transpose (X)

     Return the transpose of X.



     This function and x.' are equivalent.



     See also: ctranspose.

 -- Built-in Function: X = inv (A)

 -- Built-in Function: [X, RCOND] = inv (A)

     Compute the inverse of the square matrix A.



     Return an estimate of the reciprocal condition number if requested,

     otherwise warn of an ill-conditioned matrix if the reciprocal

     condition number is small.



     In general it is best to avoid calculating the inverse of a matrix

     directly.  For example, it is both faster and more accurate to

     solve systems of equations (A*x = b) with `Y = A \ b', rather than

     `Y = inv (A) * b'.



     If called with a sparse matrix, then in general X will be a full

     matrix requiring significantly more storage.  Avoid forming the

     inverse of a sparse matrix if possible.



     See also: ldivide, rdivide.

 -- Built-in Function:  det (A)

 -- Built-in Function: [D, RCOND] = det (A)

     Compute the determinant of A.



     Return an estimate of the reciprocal condition number if requested.



     Programming Notes: Routines from LAPACK are used for full matrices

     and code from UMFPACK is used for sparse matrices.



     The determinant should not be used to check a matrix for

     singularity.  For that, use any of the condition number functions:

     `cond', `condest', `rcond'.



     See also: cond, condest, rcond.