For implementation of the free surface boundary condition, a new subroutine has been introduced to an existing steady 3-D body fitted code. This code was previously written for steady flow simulation in closed ducts. The algorithm used in this subroutine reduces the instability problem according to the free surface wave generation. For code validation, it was applied to two different open cha...

ion | users needing timing informationdeal with one stopwatch variable instead of arrays of times and names. If the user needs several stopwatches, he simply creates several distinct variables of type stopwatch. Type safety | compilers can check that stopwatch variables are used as stopwatches in procedures. Encapsulation | implementors can easily create or change procedures that use stopwatche...

Mathematical subroutine libraries for science and engineering applications are an important tool in high-performance computing. By identifying and optimizing frequently used, numerically intensive operations, these libraries help in reducing the cost of computation, enhancing portability, and improving productivity. The Digital eXtended Math Library is a set of public domain and Digital proprie...

When learning to achieve a goal through a complex series of actions, humans often group several actions into a subroutine and evaluate whether the subroutine achieved a specific subgoal. A new study reports brain responses consistent with such "hierarchical reinforcement learning."

Numerical difficulty arises when DAEs are solved with inconsistent initial values of dependent variables. It can cause the solution failures of many popular DAEs solvers. An initialization subroutine, DAEIS (Differential Algebraic Equations Initialization Subroutine), has been developed to handle this issue. In DAEIS, consistent initial values of dependent variables for index-1 DAEs are obtaine...

In our efforts to develop an object-oriented visual programming language, the dataflow model of computation is extended from its traditional functional model to an object-oriented model. It is argued that the concept of subroutine in the object-oriented model requires two different types of calling (activation) mechanisms, the synchronous call and the asynchronous call. Asynchronous subroutine ...

This article describes the subroutine library SLICOT that provides Fortran 77 implementations of numerical algorithms for computations in systems and control theory. Around a nucleus of basic numerical linear algebra subroutines, this library builds methods for the design and analysis of linear control systems. A brief history of the library is given together with a description of the current v...