D.5.4.19 spissemicont
.....................
Procedure from library gaussman.lib (see gaussman_lib).

Usage:
spissemicont(sp[,1]); list sp, int opt

Return:
int k=
  1;  if sum of sp is positive on all intervals [a,a+1) [and (a,a+1)]
  0;  if sum of sp is negative on some interval [a,a+1) [or (a,a+1)]

Example:
LIB "gaussman.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)
spissemicont(spsub(sp1,spmul(sp2,3)));
==> 1
spissemicont(spsub(sp1,spmul(sp2,4)));
==> 0

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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; User manual for <a href="http://www.singular.uni-kl.de/"><i>Singular</i></a> version 2-0-4, October 2002,
generated by <a href="http://www.gnu.org/software/texinfo/"><i>texi2html</i></a>.
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