Fig. 2
From: An improved Four-Russians method and sparsified Four-Russians algorithm for RNA folding
An sample examination to determine wether a submatrix and vectors are \(STEP\!-\!OCT\). The yellow cells indicate STEP instances. The red cells indicate OCT instances. The \(L[I_{g'},K_g]\otimes L[K_g,j]\) operation is only performed on submatrices with \(sigSTEP \odot sigOCT >0\)