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

solves the sparse linear system A*x = b.

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

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