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\section{Basic binary I/O utilities} |
\section{RW Basic binary I/O utilities} |
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\label{sec:rw} |
\label{sec:pkg:rw} |
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The {\tt rw} package provides a very rudimentary binary I/O capability |
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for quickly writing {\it single record} direct-access Fortran binary files. |
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It is primarily used for writing diagnostic output. |
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\subsection{Introduction} |
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Package {\tt rw} is an interface to the more general {\tt mdsio} package. |
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The {\tt rw} package can be used to write or read direct-access Fortran |
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binary files for two-dimensional XY and three-dimensional XYZ arrays. |
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The arrays are assumed to have been decalred according to the standard |
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MITgcm two-dimensional or the-dimensional floating poit array type |
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(see figure \ref{fig:pkg:rw:standarddeclaration}). |
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\begin{figure} |
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\begin{verbatim} |
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C Example of declaring a standard two dimensional "long" floating |
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C point type array (the _RL macro is usually mapped to 64-bit |
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C floats in most configurations) |
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_RL anArray(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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\end{verbatim} |
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\caption{An example of the fixed form Fortran declaration for a |
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standard MITgcm two-dimensional array type. } |
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\label{fig:pkg:rw:standarddeclaration} |
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\end{figure} |
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Each call to an {\tt rw} read or write routine will read (or write) to the |
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first record of a file. To write direct access Fortran files with |
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multiple records use the package {\tt mdsio} (see section |
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\ref{sec:pkg:mdsio}). To write self-describing files that contain |
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embedded information describing the variables being written and |
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the spatial and temporal locations of those variables use the |
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package {\tt mnc} (see section \ref{sec:pkg:mnc}) which produces |
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\htlink{netCDF}{http://www.unidata.ucar.edu/packages/netcdf} |
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\cite{rew:97} based output. |
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\subsection{Key subroutines, parameters and files} |
\subsection{Key subroutines, parameters and files} |
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\label{sec:pkg:rw:implementation_synopsis} |
\label{sec:pkg:rw:implementation_synopsis} |
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The {\tt rw} package has |
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\subsection{Package Reference} |
\subsection{Package Reference} |
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