General Purpose Digitizing Program

This is a general purpose program which allows you to define and modify a set of points that describes a planar shape or curve.  To operate this program you place a scaled drawing of the data on the digitizer tablet and enter the data points with the tablet's stylus or cursor.  An "edit window" is displayed on the computer screen that follows your progress as you enter and edit the data.  You select editing and control commands from a menu located to the right of the edit window.  The program lets you define straight lines or curved segments on a point-by-point basis.  Once you have entered the information into the program, you can then calculate the area, moments, inertias, centroid and arc-length of the defined shape.

The information you have entered into the program may be written to a file, sent to a 2-dimensional CAD package, or plotted at any scale factor on your plotter.  In addition, you may use the file to send the information to our report-quality graphing program, or to load the information back into this program for further editing.

This program eliminates the need for an integrator or planimeter and can be used for tasks such as the calculation of the neutral axis of a midship section.  Another example is to digitize points from a graph in a journal or magazine.  These points can then be directly read into the graphing program whereupon a polynomial least-squares curve can be fit through them and its coefficients displayed.  These coefficients then give you a convenient way to calculate points on the graph.

HIGHLIGHTS

o  Digitizes arbitrary shapes and stores them in files

o  Straight and curved lines may be digitized

o  Calculates area, centroid, moments, inertias, and arc length of closed segments

o  Different scale factors for X and Y axes can be handled

o  Automatic cursor dimensioning displayed on the screen

o  Drawing can be edited after it has been digitized

o  Tablet buttons can be defined by the user

o  Enlarging or "zooming" can be done for detailed digitizing

o  Digitized points can be saved or retrieved from files

o  A plot of the digitized drawing can be produced at any scale factor; allows verification of the digitized points

o  Detailed help instructions available on-line

o  Digitized points can be immediately read into the General Purpose Graphing Program

General Purpose Graphing Program

This is a general purpose program used to perform plotting and analysis of datasets.  Up to 15 datasets can be read into the program from a variety of files with a flexible, free-format read routine.  Using default values, these datasets can then be plotted and analyzed with little or no additional input.

You also have complete control over many parameters of the axes and curves, such as the X-label, Y-label, and title, along with the "tick mark" labeling and grid specification.  For data analysis, you can plot various types of markers at each point, curvefit the data, or fit a least-squares curve through the data.  A variety of regression fits can be plotted, with the option of displaying the resultant coefficients and statistical information.

This program is set up to allow you to easily and quickly plot arbitrary sets of data using files from various sources.  It also allows you to refine the graph until it is suitable for inclusion into a report or proposal.  Finally, the graphs can be plotted at any  size or scale factor.

This program works well with the General Purpose Digitizing Program in that it will automatically read digitized data files saved by that program.  With this combination of programs, you can quickly digitize data from many sources, graph the data using a variety of least-squares techniques, then finally, obtain the coefficients of the regression fit.

HIGHLIGHTS

o  Produces graphs suitable for immediate use in reports

o  User definable labels, tick marks, and curve styles

o  Default values used to allow quick plots

o  Up to 15 datasets can be plotted on one graph

o  Input read from any file using free-format technique

o  Datasets given names to allow easy plot definition

o  Graphs can be plotted using any size or scale factors

o  A variety of point styles can be plotted

o  Data points can be curvefit or least-squares curfevit

o  Regression fits include polynomial, logarithmic, exponential, and powerfit

o  Statistical information about each dataset can be displayed

o  Reads data directly from files produced by the General Purpose Digitizing Program