I'm coding the program that using linked list to store a sparse matrix. First I create a class "Node" contains the index of entry, value of entry and two pointers to next row and next column. Second I find on Google that I need to create the class Matrix like this code below but I don't understand the meaning of Node **rowList and node** columnList. Why they use a pointer to a pointer there and how could I implement a matrix from that? Thank you so much.
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int iValue, jValue;
Node **rowList; // rowList is the pointer to the array of rows
Node **columnList; // columnList is the pointer to the array of columns
int rows, cols; // number of rows and columns