The {\bfseries \hyperlink{namespacegtool5}{gtool5} fortran library} is being developed for use in a variety of numerical models for research and education in geophysical and planetary fluid science. This library is being developed and maintained as part of \href{https://www.gfd-dennou.org/library/gtool/index.htm}{\tt G\+FD Dennou Club Gtool project}.

The \hyperlink{namespacegtool5}{gtool5} provides various functions for numerical models written in fortran (≥2003), such as data input/output, date/time manipulation, message output, and C\+PU time measurement. In particular, for data input/output, \hyperlink{namespacegtool5}{gtool5} adopts data input/output based on the \href{https://www.gfd-dennou.org/library/gtool/gt4ncconv/gt4ncconv_current/}{\tt gtool4 Net\+C\+DF convention} in order to facilitate multiple users to understand, recognize, and share the computational results obtained from the numerical model.

The \hyperlink{namespacegtool5}{gtool5} library has been used in \href{https://www.gfd-dennou.org/library/dcmodel/index.htm}{\tt G\+FD Dennouc Club dcmodel project} to facilitate data sharing and to improve the readability of the source code. For the detail, please refer to the \href{http://www.geosci-model-dev.net/5/449/2012/}{\tt G\+MD paper}.


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\item tar.\+gz file
\item source tree
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\item old versions and their source tree
\end{DoxyItemize}
\item \hyperlink{INSTALL}{I\+N\+S\+T\+A\+LL G\+U\+I\+DE} \+: Install Guide
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\item \hyperlink{transition-gt4f90io}{Upgrade from gt4f90io} \+: Upgrade from \hyperlink{namespacegt4f90io}{gt4f90io}
\end{DoxyItemize}
\item Tutorial
\item Documents
\item \hyperlink{CREDITS}{C\+R\+E\+D\+I\+TS} \+: Developers, Contributors List
\end{DoxyItemize}


\begin{DoxyItemize}
\item tar.\+gz file
\item source tree
\end{DoxyItemize}


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\item The source code associated with \hyperlink{namespacegtool5}{gtool5} fortran library is under the 2 terms B\+SD license.
\item The licenses of C\+SS and Javascript (e.\+g. Math\+Jax) used to display the documents generated by doxygen are as follows\+:
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\item bootstrap, jquery\+: M\+I\+T/\+X11
\item mathjax\+: Apache-\/2.\+0
\end{DoxyItemize}
\item Please refer to \mbox{[}Copyright\mbox{]}\mbox{[}\hyperlink{COPYRIGHT}{C\+O\+P\+Y\+R\+I\+G\+HT and Licenses}\mbox{]} for the official license description.
\end{DoxyItemize}

\subsubsection*{For S\+C\+I\+E\+N\+T\+I\+S\+TS}

Please be aware that the fact that these programs are released as Free Software does not excuse you from scientific propriety, which obligates you to give appropriate credit. If you write a scientific paper describing research that made substantive use of these programs, it is your obligation as a scientist to (a) mention the fashion in which this software was used with a citation to the literature or (b) mention this software in the Acknowledgements section.

Example\+: \begin{quote}
Morikawa,Y., Takahashi,O.\+Y., Sasaki,Y., Nishizawa,S., Otobe,N., Ishiwatari,M., Odaka,M., Takehiro,S., Horinouchi,T., Hayashi,Y.-\/Y., Toyoda,E., Gtool Devlopment Group, 2010\+: Gtool5 library, \href{http://www.gfd-dennou.org/library/gtool/gtool5,}{\tt http\+://www.\+gfd-\/dennou.\+org/library/gtool/gtool5,} G\+FD Dennou Club. \end{quote}


When you have to refer only an article of a refereed journal, please cite our ariticle of \mbox{[}G\+MD paper\mbox{]}\mbox{[}G\+M\+D\+\_\+paper\mbox{]} as follows\+: \begin{quote}
Ishiwatari, M., Toyoda, E., Morikawa, Y., Takehiro, S., Sasaki, Y., Nishizawa, S., Odaka, M., Otobe, N., Takahashi, Y. O., Nakajima, K., Horinouchi, T., Shiotani, M., Hayashi, Y.-\/Y., Gtool development group, 2012\+: \hyperlink{namespacegtool5}{gtool5} -\/ development of Fortran90 library for self-\/descriptive multi-\/dimensional data input/output interfaces, Geosci. Model Dev., 5, 449-\/455., 2012, doi\+:10.\+5194/gmd-\/5-\/449-\/2012. \end{quote}


The \hyperlink{namespacegtool5}{gtool5} library is the successor to \href{https://www.gfd-dennou.org/library/gtool4/gtool4-tools-library.htm)}{\tt gtool4} and \href{https://www.gfd-dennou.org/library/gtool/gt4f90io.htm}{\tt gt4f90io}.


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\item The \href{https://www.gfd-dennou.org/library/gtool/gt4f90io.htm}{\tt gt4f90io} is a library specialized in data I/O, with visualization functions separated from \href{https://www.gfd-dennou.org/library/gtool4/gtool4-tools-library.htm)}{\tt gtool4}.
\item The \hyperlink{namespacegtool5}{gtool5} is a library that added general-\/purpose utilities to \href{https://www.gfd-dennou.org/library/gtool/gt4f90io.htm}{\tt gt4f90io}. 
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