# matrixNormal 0.0.4 2020-Jul-16

- New
`vech()`

function: performs half-vectorization on a symmetric matrix. This is the vector-form of the lower triangular matrix only. Unlike other functions on CRAN, vech() inherits any names from the matrix.
`is.positive.definite()`

, `is.positive.semi.definite()`

: if A is not symmetric, these functions NOW return FALSE instead of stopping the function. Restructured helper `find.eval()`

. Change made 10/8/19
`is.symmetric()`

, `is.positive.definite()`

, `is.positive.semi.definite()`

: now return NA if A contains a missing value (`NA`

).
`dmatrixnorm`

: Clarification: replace the name of argument `use.log`

with `log`

for consistency in argument name with mvtnorm and stats package.
`rmatrixnorm`

: Added the first argument `s`

to draw many random samples. Only 1 sample is still drawn; the argument currently has no effect but acts as a placeholder in future releases.
- Clarified documentation.
- Added session information and version details to the vignette. The conclusions from the vignette still apply to the updated versions of the packages listed.

# matrixNormal 0.0.2 2019-12-5

- The documentation is clarified.
- Submitted to CRAN but failed to be released.

# matrixNormal 0.0.1 2019-07-09

- Vignette is added, replacing the package R file. Included the use and uniqueness of matrixNormal distribution. Also included an example that uses the package. Added additional packages to be imported in Documentation.
- Documentation clarified.
- Minor Changes in Examples: ** Changed order of examples in rmatnorm() for reproducibility ** Made clearer in using the dataset package in pmatnorm() example ** Removed installation of matrixcalc package in is.symmetric.matrix examples.
`is.positive.definite()`

, `is.positive.semi.definite()`

returns NA if the matrix contains missing value (bug fix).
`pmatnorm()`

, `dmatnorm()`

, `rmatnorm()`

now throws error if the parameters of the matrix Normal Distribution `M`

, `U`

, or `V`

contain any missing values.
`rmatnorm()`

now returns a matrix with rownames from U and the colnames from V.
- In
`rmatnorm()`

, `pre0.9_9994`

that was passed from `rmvnorm()`

function in **mvtnorm library** is removed, because it is not needed. This argument was introduced in mvtnorm library to fix a bug in version 0.9-9993, but matrixNormal uses a version of at least 1.0.8. This argument is just not needed, and if pre0.9_9994 is set to TRUE, nothing will happen.

# matrixNormal 0.0.0.9000

- This is a new submission.
- Added a
`NEWS.md`

file to track changes to the package.
- First Release of the Package
- Successfully passed windows check.