lusolve

Scilab Function
Last update : 20/12/2004

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 `A*x = b`

### 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` ,