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\section{The Defaults Window}\label{window, defaults}\index{Defaults window}\index{window, Defaults}
%
%
%
\begin{figure}[H]
\centerline{\psfig{figure=ps/defaults.ps,height=237pt}}
\caption{\label{defaults}
The Defaults window.
}
\end{figure}
%
%
%
\begin{description}
\item[Window title:] DsTool: Defaults
\item[Function:] The Defaults window allows the user to change
some of DsTool's default settings.
% ranges for variables, parameters and functions. It also
% allows the user to turn on and off
%data clipping and
% the recording of data. Certain global values (used in DsTool's numerical or display
% algorithms) can be set via this window.
\item[Description:] The Defaults window is opened by selecting the
Defaults option from the Panels menu button located in the
Command window. The user can change some of DsTool's values which control the
computation and display of data. Changing a default value
will not change data which has been previously computed, but
will be used to compute future data, and to display all data.
% If the save points setting is off then no data is stored.
% When save points is on, and if clipping is off, all produced
% data is stored. When data clipping is on, only data which
% is displayed in at least one view window (iconized or not)
% is stored. (This button does nothing if recording data is off.)
% The other text fields are the default viewing ranges for
% displaying data.
%\item[Window type:] pop-up
%\item[Window attributes:] pinnable(in), resizable, variable template
\item[Panel items:] \mbox{}
\begin{itemize}
% \item Coordinate System stack setting:\index{polar coordinates} \notimp{} Allows the user to
% select a coordinate system. This item is only active
% when more than one coordinate system has been defined.
% Presently the only choices are Cartesian and Polar.
\item Save points exclusive setting:\index{saving points}\index{recording data}
Allows the user to choose whether data is recorded or not.
The default is to record data.
\item Auto refresh 2-D View windows exclusive setting:\index{automatic refresh}
Allows the user to choose whether 2-D View windows will
be automatically updated when points are cleared from memory (via the ``clear last'' or
``clear all'' buttons in the Orbits window or the ``delete'' button in the Browser
window), or the variables of the 2-D View window are changed. If it is set to off, the
2-D View windows will not be updated when the previous events occur. In either case,
when new points are computed, the new points will be plotted on all existing 2-D View windows.
The default is to auto refresh 2-D View windows.
\item Plotting symbol stack setting:\index{symbol, type}\index{symbol, size}
Allows the user to choose the symbol with which trajectories are plotted.
It is possible to choose to plot with a dot, a cross, a triangle, and a box. Each
of these types come in three sizes: small, medium, and large. The default symbol is ``medium dot''.
% \item Clip Data exclusive setting:\index{clipping data} \notimp{} Allows the
% user to turn data clipping on and off. The default is off. This setting is
% inactive if Record Data is turned off.
%
% \item Window Precision numeric field:\index{precision} Allows the user to display from
% 0 to 17 digits of precision in window text fields. The
% default value is 6. The value of this field determines the precision of
% the number of decimal places displayed in the DsTool window text entries.
\item Display points after computing numeric field:\index{points, computed before plotting}
Displays the number of points to compute before
storing and displaying points. Smaller values will cause slower plotting, due to
the overhead of using X windows routines. Higher values will cause faster plotting, at the expense
of not seeing the trajectory evolve in time. The default value is 100.
\item Diverging orbit cutoff read-write text field:\index{divergence}\index{infinity}
Displays the number DsTool will use to decide whether an orbit has diverged to infinity.
If the distance from a point to the origin is greater than this number,
the orbit containing that point is deemed to have diverged, and DsTool will stop
calculation. The default value is $10^{8}$.
\item Auto-scaling factor read-write text field:\index{auto-scaling factor}\index{scale to fit}
Displays the padding factor which determines how the auto-scaling feature on
2-D View windows sets the horizontal and vertical ranges.
To find the auto-scaled range for a variable, DsTool first computes
the minimum interval $R$ required to plot all previously computed data points for that variable.
DsTool then resets the range to be the interval centered at the midpoint of $R$ with length given
by the auto-scaling factor times the length of $R$.
% Those ranges are set by multiplying the ranges required to fit all of the previously computed data
% points by the auto-scaling factor.
Consequently, an auto-scaling factor
greater than $1$ will allow all of the currently computed data to be plotted, whereas
an auto-scaling factor less than $1$ will exclude some of the data. The default
value is $1.1$.
\item {\em Name} Minimum read-write text field:
Displays the default minimum value for viewing the variable, parameter, or auxiliary function.
\item {\em Name} Maximum read-write text field:
Displays the default maximum value for viewing the variable, parameter, or auxiliary function.
\item Dismiss command button:
Closes the Defaults window.
%The fields will not revert back to their default values.
\end{itemize}
\end{description}
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