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D.6.9.15 spsub
Procedure from library gmssing.lib (see gmssing_lib).
- Usage:
- spsub(sp1,sp2); list sp1, list sp2
- Return:
- list sp; difference of spectra sp1 and sp2
Example:
| | LIB "gmssing.lib";
ring R=0,(x,y),ds;
list sp1=list(ideal(-1/2,-3/10,-1/10,0,1/10,3/10,1/2),intvec(1,2,2,1,2,2,1));
spprint(sp1);
==> (-1/2,1),(-3/10,2),(-1/10,2),(0,1),(1/10,2),(3/10,2),(1/2,1)
list sp2=list(ideal(-1/6,1/6),intvec(1,1));
spprint(sp2);
==> (-1/6,1),(1/6,1)
spprint(spsub(sp1,sp2));
==> (-1/2,1),(-3/10,2),(-1/6,-1),(-1/10,2),(0,1),(1/10,2),(1/6,-1),(3/10,2),(\
1/2,1)
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