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45 lines
2.1 KiB
45 lines
2.1 KiB
2 years ago
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\chapter{Introduction}
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\aprepro{} is an algebraic preprocessor that reads a file containing both
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general text and algebraic expressions. It echoes the general text to the output
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file, along with the results of the algebraic expressions. The syntax used in \aprepro{}
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is such that all expressions between the delimiters \textbf{\{} and \textbf{\}}
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are evaluated and all other text is simply echoed to the output file. For example,
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if the following lines are input to \aprepro{}:
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\begin{apinp}
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$ Rad = \{Rad = 12.0\}
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Point 1 \{x1 = Rad * sind(30.)\} \{y1 = Rad * cosd(30.)\}
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Point 2 \{x1 + 10.0\} \{y1\}
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\end{apinp}
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The output would look like:
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\begin{apout}
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$ Rad = 12
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Point 1 6 10.39230485
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Point 2 16 10.39230485
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\end{apout}
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In this example, the algebraic expressions are specified by surrounding them with
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\textbf{\{} and \textbf{\}}, and the functions \afunc{sind()} and \afunc{cosd()}
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calculate the sine and cosine of an angle given in degrees.
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\aprepro{} has been used extensively for several years to prepare parameterized
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files for finite element analyses using the Sandia National Laboratories
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SEACAS system~\cite{bib:seacas}. The units conversion capability has greatly increased the
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usability of \aprepro{}. \aprepro{} can also be used for non-finite element
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applications such as a powerful calculator and a general text processor for any
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file that does not use the delimiters \textbf{\{} and \textbf{\}}.
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The remainder of this document is organized as follows:
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\begin{itemize}
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\item Chapter~\ref{ch:execution} documents the command line options for \aprepro{} and the text input, editing, and recall capabilities.
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\item Chapter~\ref{ch:syntax} documents the syntax recognized by \textit{Aprepro},
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\item Chapters \ref{ch:operators}, \ref{ch:predefined}, and~\ref{ch:functions} describe the operators, predefined variables, and functions,
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\item Chapter~\ref{ch:units} describes the units conversion system,
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\item Chapter~\ref{ch:errors} describes the error messages output from \aprepro{}, and
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\item Chapter~\ref{ch:examples} presents some examples of \aprepro{} usage.
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\end{itemize}
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