English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

A new application programming interface for evaluating functions and specifying optimization problems at runtime has been developed. The new interface, named FEFAR, uses a simple language named LEFAR. Compared with other modeling languages such as AMPL or OSil, LEFAR is Fortran- like hence easy to learn and use, in particular for Fortran programmers. FEFAR itself is a Fortran subroutine hence easy to be linked to user's main programs in Fortran language. With FEFAR a developer of optimization solver can provide pre- compiled, self-executable and directly usable software products. FEFAR and LEFAR are already used in some optimization solvers and should be a useful addition to the toolbox of programmers who develop solvers of optimization problems of any type including constrained/unconstrained, linear/nonlinear, smooth/nonsmooth optimization. Keywords-programming language; Fortran computing language; Fortran subroutine; Application programming interface; Runtime function evaluation; Mathematical programming; Optimization problem; Optimization modeling language. I. INTRODUCTION In this paper we introduce to readers a new application programming interface for evaluating functions and specifying optimization problems at runtime. FEFAR is a Fortran subroutine For Evaluating Functions At Runtime. It can be linked to a programmer's main program to provide a way to evaluate a function or solve an optimization problem at runtime. The functions or optimization problems must be written in a new language called LEFAR I developed together with FEFAR, for evaluating functions or specifying optimization problems at runtime. LEFAR is similar to but much simpler than Fortran, and that is a big merit as it is easy to learn and use and yet powerful enough and complex enough to be able to specify any functions and optimization problems at runtime. FEFAR and LEFAR are already used in USsolver (1) and UNsolver (2), two binary machine code programs for solving unconstrained smooth or nonsmooth optimization problems.

A New Application Programming Interface and a Fortran-like Modeling Language for Evaluating Functions and Specifying Optimization Problems at Runtime