The SNP Default Setup File

At startup the shock normal program reads the file SNDefaults to establish a number of initial setup parameters. It looks first for this file in the directory in which it was invoked and if not present in the TclSN directory under TCLTOOLS_HOME. This allows the SNP to be customized on both a personal and system wide level.

Each line in the file defines one parameter. A line consists of a parameter name followed by a colon and then the parameter value. The parameter name should never be changed. The parameters defined include:

Solution Resolution

This is the default solution which appears in the menu at startup. Valid values include: 30x30, 15x15, 10x10, 5x5, 4x4, 3x3, 2x2, 1x1

Grid Resolution

This is the default plot grid size which appears in the menu at startup. Valid values include: 30x30, 15x15, 10x10, 5x5, 4x4, 3x3, 2x2, 1x1

Process Data By

The default method used to form the data pairs between the upstream and downstream data. Valid options include: MIRRORED, PERMUTATED

VPlotWidth

This is the width of the visual portion of the data plot in pixels. The actual plot width may be larger and if so can be accessed via the scroll bar. (See TPlotWidth below). Note that the program will default any width which is less than that needed to display the buttons across the top of the menu to an acceptable value.

VPlotHeight

This is the height of the visual portion of the data plot in pixels. The actual plot height may be larger and if so can be accessed via the scroll bar. (See TPlotHeight below).

TPlotWidth

This is the total width the data plot in pixels. If it is larger than the visual width set above in VPlotWidth then the unseen portion is accesed using the scroll bars. Note that if this value is less than VPlotWidth the program will set it internally to that value.

TPlotHeight

This is the total height the data plot in pixels. If it is larger than the visual height set above in VPlotHeight then the unseen portion is accesed using the scroll bars. Note that if this value is less than VPlotHeight the program will set it internally to that value.

MaxIterations

The maximum number of iterations used in the minimization of the Rankine-Hugoniot equations. The iteration automatically terminates if the chi-squared drops below 1e-20 or remains unchanged for a number of iterations. At times, however, the minizimation wanders about near a local minimum and in these instances the full MaxIterations are used.

PTScoll

The size of the area used for the surface plot is computed from the size allocated to the data plot. This option indicated if this area should be computed from the TPlot options above (YES) or from the VPlot options (NO). Setting to YES will cause the surface plot to require scrolling if the data plot does.