ludecomposition.html

Java方面的数值算法

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<A NAME="LUDecomposition(gov.nist.math.jama.Matrix)"><!-- --></A><H3>
LUDecomposition</H3>
<PRE>
public <B>LUDecomposition</B>(<A HREF="../../../../gov/nist/math/jama/Matrix.html" title="class in gov.nist.math.jama">Matrix</A>&nbsp;A)</PRE>
<DL>
<DD>LU Decomposition
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<DT><B>Parameters:</B><DD><CODE>A</CODE> - Rectangular matrix</DL>
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<A NAME="isNonsingular()"><!-- --></A><H3>
isNonsingular</H3>
<PRE>
public boolean <B>isNonsingular</B>()</PRE>
<DL>
<DD>Is the matrix nonsingular?
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<DD><DL>

<DT><B>Returns:</B><DD>true if U, and hence A, is nonsingular.</DL>
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<A NAME="getL()"><!-- --></A><H3>
getL</H3>
<PRE>
public <A HREF="../../../../gov/nist/math/jama/Matrix.html" title="class in gov.nist.math.jama">Matrix</A> <B>getL</B>()</PRE>
<DL>
<DD>Return lower triangular factor
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<DD><DL>

<DT><B>Returns:</B><DD>L</DL>
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<A NAME="getU()"><!-- --></A><H3>
getU</H3>
<PRE>
public <A HREF="../../../../gov/nist/math/jama/Matrix.html" title="class in gov.nist.math.jama">Matrix</A> <B>getU</B>()</PRE>
<DL>
<DD>Return upper triangular factor
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<DD><DL>

<DT><B>Returns:</B><DD>U</DL>
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<A NAME="getPivot()"><!-- --></A><H3>
getPivot</H3>
<PRE>
public int[] <B>getPivot</B>()</PRE>
<DL>
<DD>Return pivot permutation vector
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<DD><DL>

<DT><B>Returns:</B><DD>piv</DL>
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<A NAME="getDoublePivot()"><!-- --></A><H3>
getDoublePivot</H3>
<PRE>
public double[] <B>getDoublePivot</B>()</PRE>
<DL>
<DD>Return pivot permutation vector as a one-dimensional double array
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<DT><B>Returns:</B><DD>(double) piv</DL>
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<A NAME="det()"><!-- --></A><H3>
det</H3>
<PRE>
public double <B>det</B>()</PRE>
<DL>
<DD>Determinant
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<DD><DL>

<DT><B>Returns:</B><DD>det(A)
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - Matrix must be square</DL>
</DD>
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<A NAME="solve(gov.nist.math.jama.Matrix)"><!-- --></A><H3>
solve</H3>
<PRE>
public <A HREF="../../../../gov/nist/math/jama/Matrix.html" title="class in gov.nist.math.jama">Matrix</A> <B>solve</B>(<A HREF="../../../../gov/nist/math/jama/Matrix.html" title="class in gov.nist.math.jama">Matrix</A>&nbsp;B)</PRE>
<DL>
<DD>Solve A*X = B
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<DD><DL>
<DT><B>Parameters:</B><DD><CODE>B</CODE> - A Matrix with as many rows as A and any number of columns.
<DT><B>Returns:</B><DD>X so that L*U*X = B(piv,:)
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - Matrix row dimensions must agree.
<DD><CODE>java.lang.RuntimeException</CODE> - Matrix is singular.</DL>
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