lusolve

lusolve

lusolve — sparse linear system solver

Calling sequence

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

Parameters

`b`	: full real matrix
`A`	: real square sparse invertible matrix
`hand`	: handle to a previously computed sparse lu factors (output of lufact)

Description

x=lusolve(hand,b) solves the sparse linear system A*x = b.

[hand,rk]=lufact(A) is the output of lufact.

x=lusolve(A,b) solves the sparse linear system \fVA*x = b\fR.

Examples



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

See also

sparse, lufact, slash, backslash