However, browsing Internet Archive, it's true that it existed until 2017: linprog R2016a: accepts x0 param, with note "linprog uses x0 for only the 'active-set' algorithm. For all other algorithms, ...

I just downloaded MATPOWER version 6.0 to use it together with MATLAB R2016b, on a MAC OS X Yosemite. When launching the testing script test_matpower, I experienced ...