File: lusolve.cat

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scilab 2.6-4
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lusolve           Scilab Group           Scilab Function            lusolve
NAME
   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.
  
EXAMPLE
 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