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java.lang.Object  +linear_algebra.Triangular
This class contains:
This class was written by a statistician rather than a numerical analyst. When public domain Java numerical analysis routines become available from numerical analysts (e.g., the people who produce LAPACK), then the code produced by the numerical analysts should be used.
Meanwhile, if you have suggestions for improving this code, please contact Steve Verrill at steve@ws10.fpl.fs.fed.us.
Constructor Summary  
Triangular()

Method Summary  
void 
invertLower(double[][] l,
int n)
This method obtains the inverse of a lower triangular n by n matrix L. 
void 
invertUpper(double[][] u,
int n)
This method obtains the inverse of an upper triangular n by n matrix U. 
void 
solveLower(double[][] l,
double[] y,
double[] b,
int n)
This method obtains the solution, y, of the equation Ly = b where L is a known full rank lower triangular n by n matrix, and b is a known vector of length n. 
void 
solveUpper(double[][] u,
double[] x,
double[] y,
int n)
This method obtains the solution, x, of the equation Ux = y where U is a known full rank upper triangular n by n matrix, and y is a known vector of length n. 
Methods inherited from class java.lang.Object 
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait 
Constructor Detail 
public Triangular()
Method Detail 
public void solveLower(double[][] l, double[] y, double[] b, int n) throws NotFullRankException
This method obtains the solution, y, of the equation Ly = b where L is a known full rank lower triangular n by n matrix, and b is a known vector of length n.
y
 The solution vector.b
 The right hand side of the equation.n
 The order of l, y, and b.
NotFullRankException
 if one or more of the diagonal
elements of l[ ][ ] is zero.public void solveUpper(double[][] u, double[] x, double[] y, int n) throws NotFullRankException
x
 The solution vector.y
 The right hand side of the equation.n
 The order of u, x, and y.
NotFullRankException
 if one or more of the diagonal
elements of u[ ][ ] is zero.public void invertLower(double[][] l, int n) throws NotFullRankException
n
 The order of l.
NotFullRankException
 if one or more of the diagonal
elements of l[ ][ ] is zero.public void invertUpper(double[][] u, int n) throws NotFullRankException
n
 The order of u.
NotFullRankException
 if one or more of the diagonal
elements of u[ ][ ] is zero.


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