Le Cam's theorem: Difference between revisions

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In [[linear algebra]], a '''pentadiagonal matrix''' is a [[matrix (mathematics)|matrix]] that is nearly [[diagonal matrix|diagonal]]; to be exact, it is a matrix in which the only nonzero entries are on the main diagonal, and the first two diagonals above and below it. So it is of the form 
The author's name is Christy Brookins. What I love psychics ([http://www.publicpledge.com/blogs/post/7034 www.publicpledge.com]) performing is soccer but I don't have the time lately. She functions as a journey agent but soon she'll be on her personal. My spouse and I reside in Mississippi but now I'm considering other options.
 
:<math> \begin{pmatrix}
  c_1 & d_1 & e_1 & 0 & \cdots & \cdots & 0 \\
  b_1 & c_2 & d_2 & e_2 & \ddots & & \vdots \\
  a_1 & b_2 & \ddots & \ddots & \ddots & \ddots & \vdots \\
  0 & a_2 & \ddots & \ddots & \ddots & e_{n-3} & 0 \\
  \vdots & \ddots & \ddots & \ddots & \ddots & d_{n-2} & e_{n-2} \\
  \vdots & & \ddots & a_{n-3} & b_{n-2} & c_{n-1} & d_{n-1} \\
  0 & \cdots & \cdots & 0 & a_{n-2} & b_{n-1} & c_n
\end{pmatrix}. </math>
 
It follows that a pentadiagonal matrix has at most <math>5n-6</math> nonzero entries, where ''n'' is the size of the matrix. Hence, pentadiagonal matrices are [[sparse matrix|sparse]]. This makes them useful in [[numerical analysis]].
 
==See also==
* [[tridiagonal matrix]]
 
{{PlanetMath attribution|id=3927|title=Pentadiagonal matrix}}
 
[[Category:Sparse matrices]]

Revision as of 07:49, 23 February 2014

The author's name is Christy Brookins. What I love psychics (www.publicpledge.com) performing is soccer but I don't have the time lately. She functions as a journey agent but soon she'll be on her personal. My spouse and I reside in Mississippi but now I'm considering other options.