dmrg

A simple Density Matrix Renormalization Group program

Description is on Computational Physics blog: https://compphys.go.ro/density-matrix-renormalization-group/

The program can be compiled with Visual C++ on Windows (native, with mfc). It uses Eigen library for matrices.

Currenly only Heisenberg chains are implemented (both spin 1/2 and 1).

TOOLS

The project compiles on Windows with Visual Studio 2026 (the code can be compiled with older versions starting with VS 2015, but it's currently maintained with VS 2026 and C++ 17 or higher).

LIBRARIES

Besides mfc and other typical VC++ runtime libraries, the program uses GDI+ for drawing. Eigen 5 is also used. It worked with an older version as well, but I recommend using ver 5 because it has some fixed issues.

PROGRAM IN ACTION