{"action":"created","comment":{"url":"https://api.github.com/repos/gonum/matrix/pulls/comments/52555152","id":52555152,"diff_hunk":"@@ -236,3 +236,25 @@ func TestTriTriDenseCopy(t *testing.T) {\n \t\t}\n \t}\n }\n+\n+func TestTriInverse(t *testing.T) {\n+\tfor _, upper := range []bool{true, false} {\n+\t\tfor _, n := range []int{1, 3, 5, 9} {\n+\t\t\tdata := make([]float64, n*n)\n+\t\t\tfor i := range data {\n+\t\t\t\tdata[i] = rand.NormFloat64()\n+\t\t\t}\n+\t\t\ta := NewTriDense(n, upper, data)\n+\t\t\tvar tr TriDense\n+\t\t\terr := tr.InverseTri(a)\n+\t\t\tif err != nil {\n+\t\t\t\tt.Errorf(\"Bad test: bad condition number\")\n+\t\t\t}\n+\t\t\tvar d Dense\n+\t\t\td.Mul(a, &tr)\n+\t\t\tif !equalApprox(eye(n), &d, 1e-8, false) {\n+\t\t\t\tt.Errorf(\"Tri times inverse is not 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