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D.2.3.2 lprint
Procedure from library inout.lib (see inout_lib).
- Usage:
lprint(id[,n]); id poly/ideal/vector/module/matrix, n integer
- Return:
string of id in a format fitting into lines of size n, such that no monomial is destroyed, i.e. the new line starts with + or -; (default: n = pagewidth).
- Note:
id is printed columnwise, each column separated by a blank line; hence lprint(transpose(id)); displays a matrix id in a format which can be used as input.
Example:
LIB "inout.lib";
ring r= 0,(x,y,z),ds;
poly f=((x+y)*(x-y)*(x+z)*(y+z)^2);
lprint(f,40);
→ x3y2-xy4+2x3yz+x2y2z-2xy3z-y4z+x3z2
→ +2x2yz2-xy2z2-2y3z2+x2z3-y2z3
module m = [f*(x-y)],[0,f*(x-y)];
string s=lprint(m); s;"";
→ x4y2-x3y3-x2y4+xy5+2x4yz-x3y2z-3x2y3z+xy4z+y5z+x4z2+x3yz2-3x2y2z2-xy3z2
→ +2y4z2+x3z3-x2yz3-xy2z3+y3z3,
→ 0,
→
→ 0,
→ x4y2-x3y3-x2y4+xy5+2x4yz-x3y2z-3x2y3z+xy4z+y5z+x4z2+x3yz2-3x2y2z2-xy3z2
→ +2y4z2+x3z3-x2yz3-xy2z3+y3z3
→
execute("matrix M[2][2]="+s+";"); //use the string s as input
module m1 = transpose(M); //should be the same as m
print(m-m1);
→ 0,0,
→ 0,0
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