Towards a next-generation matrix library for Java

Matrices are essential in many fields of computer science, especially when large amounts of data must be handled efficiently. Despite this de-mand for matrix software, we were unable to find a Java library which was flexible enough to match all our needs. In this paper, we present the Universal Java Matrix Package (UJMP), an innovative software ar-chitecture in Java to store and process matrices with interfaces to external data sources such as Excel files or SQL-databases, allowing to handle data which would not fit into main memory. In contrast to all other approaches which we are aware of, our package is the only one to support very large matrices with up to 263 rows or columns. Th use of variable argument lists provides a convenient way for accessing multi-dimensional data with-out the need to specify dimensionality at compile time. Arbitrary data types be handled through the use of Java Generics. Another key feature is the strict separation of interfaces and classes, making data storage im-plementation and math engine exchangeable, at runtime. This flexible architecture allows the user to decide whether operations should be opti-mized for speed or memory usage and makes the system easily extendable through existing libraries, incorporating their individual strengths. 1