This paper presents a numerical comparison between algorithms for unconstrained optimization that take account of sparsity in the second derivative matrix of the objective function. Some of the ...

The fundamental data object on which all Interactive Matrix Language commands operate is a two-dimensional (row × column) numeric or character matrix. By their very nature, matrices are useful for ...

With SAS/IML software, a numeric element can have a special value called a missing value that indicates that the value is unknown or unspecified. Such missing values are coded, for logical comparison ...