nloptr 2.1.0

A new version of the nloptr package has been released!

This release deprecates the default behavior of the inequality equations in any wrapper function which uses them. Currently, they are calibrated to be \(\ge 0\). This version allows for the equations to be consistent with the main nloptr() function, which requires \(\le 0\). In a future release, the default behavior will switch to assuming the calibration is \(\le 0\), and eventually, the \(\ge 0\) behavior will be removed. It also includes a large number of safety and efficiency changes, and an expansion of the unit tests to 100% coverage for all files but one. The major changes include:

• Reversed the direction of the inequality equations hin and hinjac in the wrapper functions which use them, bringing them into compliance with the main nloptr() call. This addresses Issue #148;
• Cleaned the Hock-Schittkowski problem no. 100, Hartmann 6-dimensional, and Powell exponential examples. This addresses Issue #152 and Issue #156;
• Updated roxygen version;
• Updated maintainer email;
• Deal with NA returns from parallel::detectCores() (contributed by @jeroen in Pull Request #150;
• Setup rhub v2 checks;
• Update cmake installation instructions on Mac with brew Issue #146;
• Allow use of equality constraints with COBYLA Issue #135;
• Replaced the unit testing framework of testthat with tinytest (See Issue #136);
• Brought coverage of is.nloptr() to 100%. The only file not completely covered by unit tests is nloptr.c. The uncovered calls are error messages which get trapped by tests in R before the call gets to C;
• Linted package for code correctness and consistency;
• Updated vignette, DESCRIPTION, and NEWS;
• Updated package website to use bootstrap 5;
• Expanded unit tests: coverage now over 97% with no file below 90%;
• Removed forcing C++11;
• Added safety checks to C code;
• Added many safety and efficiency enhancements to R code;
• Most R code style made self-consistent;
• Updated documentation and messages for accuracy and mathematical formatting
• Updated Github actions;
• Some bugfixes (e.g. in isres() or the warning in nl.grad()).