fpc/packages/numlib/doc/iom.tex

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% part of numlib docs. In time this won't be a standalone pdf anymore, but part of a larger part.
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\documentclass{report}

\usepackage{fpc}
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  basicstyle=\small,
  language=delphi,
  commentstyle=\itshape,
  keywordstyle=\bfseries,
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  frame=
}

\makeindex

\newcommand{\FunctionDescription}{\item[Description]\rmfamily}
\newcommand{\Dataorganisation}{\item[Data Struct]\rmfamily}
\newcommand{\DeclarationandParams}{\item[Declaration]\rmfamily}
\newcommand{\References}{\item[References]\rmfamily}
\newcommand{\Method}{\item[Method]\rmfamily}
\newcommand{\Precision}{\item[Precision]\rmfamily}
\newcommand{\Remarks}{\item[Remarks]\rmfamily}
\newcommand{\Example}{\item[Example]\rmfamily}
\newcommand{\ProgramData}{\item[Example Data]\rmfamily}
\newcommand{\ProgramResults}{\item[Example Result]\rmfamily}

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%

\begin{document}
\FPCexampledir{../examples}
\section{general comments}

\textbf{Original comments:} \\
The used floating point type \textbf{real} depends on the used
version, see the general introduction for more information. You'll
need to USE units typ and iom to use these routines.

\textbf{MvdV notes:} \\
Integers used for parameters are of type "ArbInt" to avoid problems
with systems that define integer differently depending on mode.

Floating point values are of type "ArbFloat" to allow writing code
that is independent of the exact real type. (Contrary to directly
specifying single, real, double or extended in library and
examples). Typ.pas and the central includefile have some conditional
code to switch between floating point types.

These changes were already prepared somewhat when I got the lib, but
weren't consequently applied. I did that while porting to FPC.

\section{Unit iom}


\begin{procedure}{iomrev}

\FunctionDescription Procedure to read a vector from file.

\Dataorganisation The procedure assumes that the program that is
calling it has declared a one dimensional vector where the data will
be stored in.

\DeclarationandParams

\lstinline|procedure iomrev(var inp: text; var v: ArbFloat; n:|
\lstinline|ArbInt);|

\begin{description}
 \item[var inp: text] \mbox{} \\
   The parameter {\bf inp} contains the file where the components of the vector are stored in.
 \item[var v: ArbFloat] \mbox{} \\
   Parameter {\bf v} must contain the top array element.
 \item[n: ArbInt] \mbox{} \\
   The parameter {\bf n} contains the length of the resulting vector.
\end{description}

\Remarks
  This procedure does not do array range checks. When called with invalid
  parameters, invalid/nonsense responses or even crashes may be the result.

\Example Reading and printing the vector \[(1,\; 2,\; 3,\; 4,\;
5)^{T}\].

\NUMLIBexample{iomrevex}

\ProgramData Below is the data from the inputfile shown.
\begin{verbatim}
 1  2  3  4  5
\end{verbatim}

\ProgramResults Running the example program {\bf iomrevex} when
using the real type single gives the following results.

\begin{verbatim}
v =
  1.000E+0000   2.000E+0000   3.000E+0000   4.000E+0000   5.000E+0000
\end{verbatim}

%\Precision

%\Method

%\References

\end{procedure}
%===========================================================================
\begin{procedure}{iomwrv}

\FunctionDescription Procedure to write a vector to file.

\Dataorganisation The procedure assumes that the program that is
calling it has declared a one dimensional vector where the data is
stored in.

\DeclarationandParams \lstinline|procedure iomwrv(var out: text;|
\lstinline|var v: ArbFloat; n, form: ArbInt);|

\begin{description}
  \item[var out: text] \mbox{} \\
   The parameter {\bf out} contains the file where the components of the vector are stored in.
  \item[var v: ArbFloat] \mbox{} \\
   Parameter {\bf v} must contain the top array element.
  \item[n: ArbInt] \mbox{} \\
   The parameter {\bf n} contains the length of the vector.
  \item[form: ArbInt] \mbox{} \\
   The parameter {\bf form} controls the number of decimals of the floating point representation.
\end{description}

\Remarks If the number of elements of the vector is so big that the
vector does not fit one line, then the vector is split up over
several lines.

One line is typically 78 character positions. (It is possible though
to change the global unit variable {\bf npos} that controls the
number of characters).

{\bf NOTE} \\
  This procedure does not do array range checks. When called with invalid
  parameters, invalid/nonsense responses or even crashes may be the result.

\Example A random generated 5-vector $v$, with components between
 $-1$ and $+1$, is written to file in two ways with {\bf form}=15 and {\bf form}=12.

\ProgramData

\NUMLIBexample{iomwrvex}

\ProgramResults Running the example program {\bf iomwrvex} when
using the real type single will give a similar result.

\begin{verbatim}
-9.193040E-0001  -2.695178E-0001  -1.123863E-0001  -8.804156E-0001
-4.882166E-0001

-9.193E-0001  -2.695E-0001  -1.124E-0001  -8.804E-0001  -4.882E-0001
\end{verbatim}

%\Precision
%
%\Method
%
%\References

\end{procedure}
%===========================================================================

\begin{procedure}{iomrem}

\FunctionDescription Procedure for reading a rectangular matrix.

\Dataorganisation The procedure assumes that the program that is
calling it has declared a two dimensional matrix where the data will
be stored in.

\DeclarationandParams

\lstinline|procedure iomrem(var inp: text; var a: ArbFloat; m, n,|
\lstinline|rwidth: ArbInt);|

\begin{description}
  \item[var inp: text] \mbox{} \\
   The parameter {\bf inp} contains the file where the components of the matrix are stored in.
 \item[var a: ArbFloat] \mbox{} \\
   Parameter {\bf a} must contain the left top array element.
 \item[m: ArbInt] \mbox{} \\
   Parameter {\bf m} contains the column length of the matrix to be read.
 \item[n: ArbInt] \mbox{} \\
   Parameter {\bf n} contains the row length of the matrix to be read.
 \item[rwidth: ArbInt] \mbox{} \\
   Parameter {\bf rwidth} contains the declared rowlength of the two
   dimensional array where the matrix will be stored in.
\end{description}

\Remarks This procedure does not do array range checks. When called
with invalid parameters, invalid/nonsense responses or even crashes
may be the result.

\Example reading and printing if the  $3 \times 2$-matrix

\[ \left( \begin{array}{cc}
                 1 & 2 \\
                 3 & 4 \\
                 5 & 6
          \end{array}
   \right).
\]

\ProgramData

\NUMLIBexample{iomremex}

\ProgramResults Running the example program {\bf iomremex} when
using the real type single gives the following results.

\begin{verbatim}
A=

 1.000E+0000   2.000E+0000
 3.000E+0000   4.000E+0000
 5.000E+0000   6.000E+0000
\end{verbatim}

%\Precision
%
%\Method
%
%\References

\end{procedure}
%===========================================================================
\begin{procedure}{iomwrm}

\FunctionDescription Procedure for writing a rectangular matrix to
file.

\Dataorganisation The procedure assumes that the program that is
calling it has declared a two dimensional matrix where the data will
be stored in.

\DeclarationandParams \lstinline|procedure iomwrm(var out: text;|
\lstinline|var a: real; m, n, rwidth, form: integer);|

\begin{description}
 \item[var out: text] \mbox{} \\
   The parameter {\bf out} contains the file where the components of the matrix are stored.
 \item[var a: real] \mbox{} \\
   Parameter {\bf a} must contain the left top array element.
 \item[m: integer] \mbox{} \\
   Parameter {\bf m} contains the column length of the matrix.
 \item[n: integer] \mbox{} \\
   Parameter {\bf n} contains the row length of the matrix.
 \item[rwidth: integer] \mbox{} \\
   Parameter {\bf rwidth} contains the true column count of the declared matrix.
 \item[form: integer] \mbox{} \\
   The parameter {\bf form} controls the number of decimals of the floating point representation.
\end{description}

\Remarks If the number of columns of the matrix is so big that the
row does not fit one line, then the matrix columns are split up over
several lines separated by an empty line.

One line is typically 78 character positions. (It is possible though
to change the global unit variable {\bf npos} that controls the
number of characters).

{\bf NOTE} \\
  This procedure does not do array range checks. When called with invalid
  parameters, invalid/nonsense responses or even crashes may be the result.

\Example Of a $5 \times 13$-matrix $A$ with elements
$A_{ij}=-(i+j/10), 1 \leq i \leq 5,\ 1 \leq j \leq 13$, is the $3
\times 6$ block matrix $(A_{ij}), \ 2 \leq i \leq 4, \ 3 \leq j \leq
8$ written to file with {\bf form}=14 and {\bf form}=10.

\ProgramData

\NUMLIBexample{iomwrmex}

\ProgramResults Running the example program {\bf iomwrmex} when
using the real type single gives the following results.

\begin{verbatim}
-2.30000E+0000  -2.40000E+0000  -2.50000E+0000  -2.60000E+0000
-3.30000E+0000  -3.40000E+0000  -3.50000E+0000  -3.60000E+0000
-4.30000E+0000  -4.40000E+0000  -4.50000E+0000  -4.60000E+0000

-2.70000E+0000  -2.80000E+0000 -3.70000E+0000  -3.80000E+0000
-4.70000E+0000  -4.80000E+0000

-2.3E+0000  -2.4E+0000  -2.5E+0000  -2.6E+0000  -2.7E+0000
-2.8E+0000 -3.3E+0000  -3.4E+0000  -3.5E+0000  -3.6E+0000
-3.7E+0000  -3.8E+0000 -4.3E+0000  -4.4E+0000  -4.5E+0000
-4.6E+0000  -4.7E+0000  -4.8E+0000
\end{verbatim}

%\Precision
%
%\Method
%
%\References

\end{procedure}

%===========================================================================
\begin{procedure}{iomwrms}

\FunctionDescription Procedure for writing a rectangular matrix to a
string.

\Dataorganisation The procedure assumes that the program that is
calling it has declared a two dimensional matrix where the data will
be stored in.

\DeclarationandParams \lstinline|procedure iomwrms(var out:|
\lstinline|ArbString; var a: ArbFloat; m, n, form, c: ArbInt);|

\begin{description}
 \item[var out: ArbString] \mbox{} \\
   The parameter {\bf out} contains the string where the components of the matrix are stored.
 \item[var a: ArbFloat] \mbox{} \\
   Parameter {\bf a} must contain the left top array element.
 \item[m: ArbInt] \mbox{} \\
   Parameter {\bf m} contains the column length of the matrix.
 \item[n: ArbInt] \mbox{} \\
   Parameter {\bf n} contains the row length of the matrix.
 \item[form: ArbInt] \mbox{} \\
   The parameter {\bf form} controls the number of decimals of the floating point representation.
 \item[c: ArbInt] \mbox{} \\
   The parameter {\bf c} contains the true column count of the declared matrix.
\end{description}

\Remarks This procedure does not do array range checks. When called
with invalid parameters, invalid/nonsense responses or even crashes
may be the result.

\Example

\NUMLIBexample{iomrewrsex}

\ProgramData
\begin{verbatim}
{1 2}{3 4}{5 6}
\end{verbatim}

\ProgramResults
\begin{verbatim}
A = { 1.0E+0000  2.0E+0000 }{ 3.0E+0000  4.0E+0000 }{ 5.0E+0000
6.0E+0000 }
\end{verbatim}

%\Precision
%
%\Method
%
%\References

\end{procedure}
%===========================================================================

\begin{procedure}{iomrems}

\FunctionDescription Procedure for reading a rectangular matrix from
string.

\Dataorganisation The procedure assumes that the program that is
calling it has declared a two dimensional matrix where the data will
be stored in.

\DeclarationandParams \lstinline|procedure iomrems(inp: ArbString;|
\lstinline|var a: ArbFloat; var m, n: ArbInt; c: ArbInt);|

\begin{description}
  \item[inp: ArbString] \mbox{} \\
    De parameter {\bf inp} contains the string where all components of the new matrix are stored in.
  \item[var a: ArbFloat] \mbox{} \\
   Parameter {\bf a} must contain the left top array element.
  \item[var m: ArbInt] \mbox{} \\
   Parameter {\bf m} contains the column length of the matrix.
  \item[var n: ArbInt] \mbox{} \\
   Parameter {\bf n} contains the row length of the matrix.
  \item[c: ArbInt] \mbox{} \\
   Parameter {\bf c} contains the true column count of the declared matrix.
\end{description}

\Remarks This procedure does not do array range checks. When called
with invalid parameters, invalid/nonsense responses or even crashes
may be the result.

\Example

\NUMLIBexample{iomrewrsex}

\ProgramData
\begin{verbatim}
{1 2}{3 4}{5 6}
\end{verbatim}

\ProgramResults
\begin{verbatim}
A = { 1.0E+0000  2.0E+0000 }{ 3.0E+0000  4.0E+0000 }{ 5.0E+0000
6.0E+0000 }
\end{verbatim}

%\Precision
%
%\Method
%
%\References

\end{procedure}

\end{document}