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D.15.1.33 arr2multarr
Procedure from library arr.lib (see arr_lib).
- Usage:
- multArrFromIntvec(arr A, intvec v);
- Return:
- [multarr] multiarrangement MA, which is the arrangement A with multiplicities v
- Note:
- the size of v must match the number of hyperplanes of the arrangement A
Example:
| | LIB "arr.lib";
ring R = 0,(x,y,z),dp;
arr A = arrTypeB(3); A;
==> _[1]=x-y
==> _[2]=x+y
==> _[3]=x-z
==> _[4]=x+z
==> _[5]=x
==> _[6]=y-z
==> _[7]=y+z
==> _[8]=y
==> _[9]=z
==>
intvec v=2:9; v;
==> 2,2,2,2,2,2,2,2,2
multarr MA=arr2multarr(A,v);
MA;
==> _[1]=(x-y)^2
==> _[2]=(x+y)^2
==> _[3]=(x-z)^2
==> _[4]=(x+z)^2
==> _[5]=(x)^2
==> _[6]=(y-z)^2
==> _[7]=(y+z)^2
==> _[8]=(y)^2
==> _[9]=(z)^2
==>
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See also:
arr2multarr;
multarr2arr.
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