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Thursday, June 10, 2010

Eigenvalues of an Inverse Matrix

If lambda is an eigen value of a matrix A, then
1/lambda is an eigen value of the inverse matrix of A.


http://en.wikipedia.org/wiki/Inverse_eigenvalues_theorem

Monday, May 3, 2010

AMBER on Macintosh: Installing g95 or gfortran with MacPorts

Here is how to install gfortran on Mac using macport.

sudo port install g95


if not working

sudo port install gcc45 +gfortran



AMBER on Macintosh: Installing g95 or gfortran with MacPorts

Sunday, May 2, 2010

Migration – MacPorts

After I installed Snow Leopard, macport was not working well, especially when I tried to install texmacs and octave. Below is the site that showed me the entire step to fresh MacPort by reinstalling everything again.


Migration – MacPorts: "sudo ./restore_ports.tcl myports.txt"

Wednesday, April 28, 2010

LaTeX/Packages/Listings - Wikibooks, collection of open-content textbooks

A way to easily convert FORTRAN code to LaTex

LaTeX/Packages/Listings - Wikibooks, collection of open-content textbooks


\documentclass[11pt]{article}
%\usepackage{geometry}                % See geometry.pdf to learn the layout options. There are lots.
%\geometry{letterpaper}                   % ... or a4paper or a5paper or ...
%\geometry{landscape}                % Activate for for rotated page geometry
%\usepackage[parfill]{parskip}    % Activate to begin paragraphs with an empty line rather than an indent
%\usepackage{graphicx}
%\usepackage{amssymb}
%\usepackage{epstopdf}
\usepackage{listings}
\lstset{ %
language= Fortran,                % choose the language of the code
basicstyle=\footnotesize,       % the size of the fonts that are used for the code
basicstyle=\scriptsize,
numbers=left,                   % where to put the line-numbers
numberstyle=\footnotesize,      % the size of the fonts that are used for the line-numbers
numberstyle=\scriptsize,      % the size of the fonts that are used for the line-numbers
stepnumber=2,                   % the step between two line-numbers. If it's 1 each line will be numbered
numbersep=5pt,                  % how far the line-numbers are from the code
%backgroundcolor=\color{white},  % choose the background color. You must add \usepackage{color}
%showspaces=false,               % show spaces adding particular underscores
%showstringspaces=false,         % underline spaces within strings
%showtabs=false,                 % show tabs within strings adding particular underscores
frame=single,                % adds a frame around the code
tabsize=2,                % sets default tabsize to 2 spaces
captionpos=b,                   % sets the caption-position to bottom
breaklines=true,                % sets automatic line breaking
breakatwhitespace=false,        % sets if automatic breaks should only happen at whitespace
title=\lstname,                 % show the filename of files included with \lstinputlisting; also try caption instead of title
escapeinside={\%*}{*)}          % if you want to add a comment within your code
%morekeywords={*,...}            % if you want to add more keywords to the set
}
%\DeclareGraphicsRule{.tif}{png}{.png}{`convert #1 `dirname #1`/`basename #1 .tif`.png}

\title{Brief Article}
\author{The Author}
%\date{}                                           % Activate to display a given date or no date

\begin{document}
\maketitle
%\section{}
%\subsection{}

\lstinputlisting[language=Fortran]{pGrand_hsnj.f}
\lstinputlisting[language=Fortran]{pHydroTort_FT_F.f90}

\end{document}

Thursday, March 11, 2010

How to add a new rpm using repoman

I needed to install pdftk rpm in my RHEL 5 host using repoman. Here is one that I figured out.

1. Download a necessary rpm from any source.

2. Copy the rpm file to a sub-directory under /deport/. In my case, it is
/depot/contrib/rhel/5/x86_64/

3. Type and enter:

ngedit

and follow instruction.

To manually update repository, type/enter:

repoman -r "Repo for rhel-5-x86_64" -u

Of course, contents in " " is specified for a given repository name. Option "-u" indicates update.

4. Select "next" in most sequential cases in repoman. Click the name of rpm that you want to install. And, finally enjoy using it.

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