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IR-FISTA

This repository contains the code developed for the numerical tests in the following paper.

Yunier Bello-Cruz, Max L. N. Gonçalves, and Nathan Krislock. On FISTA with a relative error rule. Computational Optimization and Applications, 2022. https://doi.org/10.1007/s10589-022-00421-8

The src directory contains our implementation of I-FISTA and IA-FISTA for solving the $H$-weighted nearest correlation matrix (NCM) problem.

To run the numerical tests:

cd src
julia --project=.. runtests.jl

Uses the MATLAB code CorNewton3.m by Houduo Qi, Defeng Sun, and Yan Gao to obtain a good initial point by solving the nearest correlation problem. CorNewton3.m is based on the algorithm in the following paper.

Houduo Qi and Defeng Sun. A quadratically convergent Newton method for computing the nearest correlation matrix. SIAM J. Matrix Anal. Appl., 28(2):360–385, 2006. doi:10.1137/050624509