Matrix method derived from graph method of SI circuit solution

This paper deals with the symbolic solution of the switched current circuits. As is described, the general principle of the transformation graph method can be used for finding admittance matrix of medium size networks and/or sub-networks. The admittance matrix is assembled from four submatrices after reduction each submatrix by partial reduction formula. There is described principle for decomposition general reduction formula into partial reduction formula. Thus solving is more clearly than reduction matrices after composition from submatrices.