https://rhigginbottom.r-universe.dev/matrixmodphttps://rhigginbottom.r-universe.dev/api/packages/matrixmodphttps://rhigginbottom.r-universe.dev/matrixmodp/matrixmodp.pdfhttps://rhigginbottom.r-universe.dev/matrixmodp/doc/manual.htmlhttps://rhigginbottom.r-universe.dev/matrixmodp/NEWShttps://rhigginbottom.r-universe.dev/matrixmodp/NEWS.txthttps://rhigginbottom.r-universe.dev/matrixmodp/citationhttps://rhigginbottom.r-universe.dev/matrixmodp/citation.txthttps://rhigginbottom.r-universe.dev/matrixmodp/citation.cff