\returns true if the matrix of which *this is the LU decomposition is invertible. * * \note This method has to determine which pivots should be

Sets all coefficients to zero. */

* \brief Reports whether the minimization was successful * \returns \c Success if the minimization was successful, * \c NumericalIssue i

Always returns false.

Gets the number of all test parts. This is the sum of the number of successful test parts and the number of failed test parts.

Returns n! (the factorial of n). For negative n, n! is defined to be 1.

Runs the test program and returns a list of test lists. Args: extra_env: a map from environment variables to their values args: command lin

Checks whether sharding is enabled by examining the relevant environment variable values. If the variables are present, but inconsistent (i.e., shard_

\returns a const expression of the diagonal coefficients. */

\returns the matrix \b Z. */