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Scilab help >> Sparses Matrix > Sparse Decompositions > lusolve

lusolve

疎な線形システムの解を得る

呼び出し手順

lusolve(hand,b)
lusolve(A,b)

パラメータ

b

通常の実数行列

A

可逆な実数正方疎行列

hand

疎行列LU分解を計算した際のハンドル(lufactの出力)

説明

x=lusolve(hand,b) は疎な線形システム A*x = bを解きます.

[hand,rk]=lufact(A) は lufact の出力です.

x=lusolve(A,b)は,疎な線形システム A*x = bを解きます.

non_zeros=[1,2,3,4];rows_cols=[1,1;2,2;3,3;4,4];
sp=sparse(rows_cols,non_zeros);
[h,rk]=lufact(sp);x=lusolve(h,[1;1;1;1]);ludel(h)
rk,sp*x

non_zeros=[1,2,3,4];rows_cols=[1,1;2,2;3,3;4,4];
sp=sparse(rows_cols,non_zeros);
x=lusolve(sp,-ones(4,1));
sp*x

参照

  • sparse — 疎行列を定義
  • lufact — 疎行列LU分解
  • slash — (/) 右除算およびフィードバック
  • backslash — (\) 左行列除算.
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Last updated:
Tue Apr 02 17:37:33 CEST 2013