| 摘要 |
PURPOSE:To speed up a tracing processing time by rewriting part of the storage of connection relation while connecting lines at a branch point. CONSTITUTION:A corresponding line element management storage area 3 is retrieved by a decided preceding connection line element number, and when a preceding connection sequence code is positive, a succeeding connection line element number is stored as a preceding line element number 6 and a succeeding connection sequence code is stored as a preceding sequence code 7. When the level of the preceding connection sequence code 7 is inverted, the succeeding connection sequence number is stored as a succeeding line element number 8 and the succeeding connection sequence code is stored as a succeeding sequence code 9. Then the corresponding area 3 is retrieved as the succeeding connection line element number and when the level of the succeeding connection sequence code is positive, the preceding connection line element number is stored as a preceding line element number 6 and the preceding connection code is stored as the preceding sequence code 7. When the level is converse, the preceding connection line element number is stored as the succeeding line element number 8 and the preceding connection sequence code is stored as the succeeding sequence code 9 respectively.
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