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Hi Zhang,
In order to achieve your objective, you will need to build a Matrix Index. Asssuming that your node layer has a field that contains the TAZ ID fot the centroids, building an index is very easy.
You will need to open the node layer, select the centroids, switch to the matrix and choose Matrix-Indices. You now choose to add a new index. In the new dialog box, specify that the original ID's of the matrix come from the TAZ field, build an index on both rows and columns and specify the new ID's come from the ID field for the selection set. Click ok to build the index. 16