Q E P C A D - ESPCAD

The ESPCAD (or Extended-Sign PCAD) just extends the PCAD structure. The pieces of information to be added are

SC_SIGN
If cell C is an i-level cell of an ESPCAD (Extended sub-CAD), then field SC_SIGN is a list (s_1,s_2, ... ,s_m), such that there are m i-level projection factors for the ESPCAD, and s_j is the sign of the jth i-level projection factor in C.

SC_EXTS
If cell C is an i-level cell of an ESPCAD (Extended sub-CAD), then field SC_EXTS is a list (s_1,s_2, ... ,s_m), such that there are m i-level projection factors for the ESPCAD, and s_j is the index of the jth i-level projection factor in C.

SC_TMPM
This is a temporary mark whose use is variable.

SC_RRNV
If cell C is an i-level cell of an ESPCAD (Extended sub-CAD), then field SC_RRNV is a list (s_1,s_2, ... ,s_m), such that there are m (i+1)-level projection factors, and s_j gives the number of distinct real roots of the jth (m+1)-level projection factor over C. If the jth polynomial is identically zero over C, then s_j is -1.

Here's a list of programs for manipulating ESPCAD's: LIST


Christopher W. Brown
Last modified: Tue Jul 30 15:24:34 EDT 2002