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7.10.6.19 ncrepInvert

Procedure from library ncrat.lib (see ncrat_lib).

Usage:
ncrep s = ncrepInvert(q);
q of type ncrep

Return:
representation of h = inv(f)
if q is a representation of f

Example:
 
LIB "ncrat.lib";
ncInit(list("x", "y", "z"));
ncrat f = ncratFromString("2*x*y");
ncrep q = ncrepGet(f);
ncrep s = ncrepInvert(q);
print(s);
==> lvec=
==> 1,0,0,0,0
==> 
==> mat=
==> 0,0, 0, 0,     1,  
==> 0,0, 0, -1/2*x,1/2,
==> 0,0, -1,1/2,   0,  
==> 0,-y,1, 0,     0,  
==> 1,1, 0, 0,     0   
==> 
==> rvec=
==> 1,
==> 0,
==> 0,
==> 0,
==> 0 


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