nric.html

来自「矩阵算法库newmat10.tar.gz的帮助文件」· HTML 代码 · 共 53 行

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<HTML><HEAD><TITLE>Newmat09 - Numerical Recipes in C</TITLE></HEAD><BODY><H2>Interface to Numerical Recipes in C</H2><A HREF="except.html">  next</A> - <A HREF="except.html">  skip</A> - <A HREF="refer.html">  up</A> - <A HREF="index.html">  start</A><P>This package can be used with the vectors and matrices defined in<I>Numerical Recipes in C</I>. You need to edit the routines in NumericalRecipes so that the elements are of the same type as used in thispackage. Eg replace float by double, vector by dvector and matrix bydmatrix, etc. You may need to edit the function definitions to usethe version acceptable to your compiler (if you are using the first editionof NRIC). You may need to enclose the code fromNumerical Recipes in <TT>extern "C" { ... }</TT>. You will also need to includethe matrix and vector utility routines.<P>Then any vector in Numerical Recipes with subscripts starting from 1 ina function call can be accessed by a RowVector, ColumnVector orDiagonalMatrix in the present package. Similarly any matrix withsubscripts starting from 1 can be accessed by an  nricMatrix  in thepresent package. The class nricMatrix is derived from Matrix and can beused in place of Matrix. In each case, if you wish to refer to aRowVector, ColumnVector, DiagonalMatrix or nricMatrix X in an functionfrom Numerical Recipes, use <TT>X.nric()</TT> in the function call.<P>Numerical Recipes cannot change the dimensions of a matrix or vector. Somatrices or vectors must be correctly dimensioned before a NumericalRecipes routine is called.<P>For example<PRE>   SymmetricMatrix B(44);   .....                             // load values into B   nricMatrix BX = B;                // copy values to an nricMatrix   DiagonalMatrix D(44);             // Matrices for output   nricMatrix V(44,44);              //    correctly dimensioned   int nrot;   jacobi(BX.nric(),44,D.nric(),V.nric(),&nrot);                                     // jacobi from NRIC   cout &lt;&lt; D;                        // print eigenvalues</PRE><P><A HREF="except.html">  next</A> - <A HREF="except.html">  skip</A> - <A HREF="refer.html">  up</A> - <A HREF="index.html">  start</A><P></BODY></HTML>

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