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-
- F U D G I T Version 2.32
- May 93
-
- Martin-D. Lacasse <isaac@physics.mcgill.ca>
-
- FUDGIT compiles on AIX, DATA GENERAL, HPUX, IRIX, LINUX , NeXT,
- SUNOS, OSF, and ULTRIX.
-
- See the Installation file for compiling.
- ------------------------------------------------------------
- Here is a brief description of FUDGIT:
-
- ******** What is FUDGIT? ********
-
- FUDGIT is a double-precision multi-purpose fitting program.
- It can manipulate complete columns of numbers in the form
- of vector arithmetic. FUDGIT is also an expression language
- interpreter understanding most of C grammar except pointers.
- Morever, FUDGIT is a front end for any plotting program supporting
- commands from stdin. It is a nice mathematical complement to
- GNUPLOT, for example.
-
- The main features of FUDGIT are:
- - Command shell including history;
- - Possible abbreviation of all the ``fitting mode'' commands;
- - Possible plural when it makes sense too;
- - Interactive shell supporting flow control (while,
- if-else-endif, foreach);
- - User definable macros;
- - User definable aliases;
- - On-line help;
- - On-line loadable procedure- or function-objects;
- - On-line selectable plotting program;
- - Fourier transforms;
- - Spline interpolation;
- - Smoothing;
- - Double-precision built-in calculator;
- - Built-in interpreter supporting most of C language including
- flow control (if, else, while, for, break, continue);
- - User definable functions and procedures;
- - Double-precision vector arithmetic;
- - Access to the complete C math library;
- - Access to any external C or FORTRAN routines/libraries
- through dynamic loading;
- - Built-in fitting series such as:
- + power series (polynomial);
- + sine series;
- + cosine series;
- + Legendre polynomials;
- + series of Gaussians;
- + series of exponentials;
- - User definable fitting functions;
- - Totally dynamical allocation of variables and parameters;
- - Possible selection of fitting ranges;
-
- FUDGIT has a collection of fitting routines including:
- - straight line (linear) least squares;
- - straight line (linear) least absolute deviation;
- - general linear least squares using QR decomposition;
- - general linear least squares using singular value decomposition;
- - nonlinear Marquardt-Levenberg method;
-
- Refer to the ``User's Manual'' for a complete description and a
- tutorial on I/O and fitting.
-
- ******** The Different Modes ********
-
- FUDGIT is composed of three different modes. These modes can be
- thought of as a C-shell like interpreter linked with a calculator,
- sharing the same variables in memory, and with a plotting program of
- your choice.
-
- The C-shell like interpreter is called the ``fitting mode''. It is
- the central mode and is the one from which all accesses to the disk
- are done. This mode has a range of commands allowing the user to read
- vectors from or save vectors to a data file, to read a command script,
- save the command history, do a Fourier transform of a vector, make a
- linear or nonlinear least square fit, etc... This mode also allows the
- user to define macros and aliases, and to perform plotting-fitting
- batch processes by using some of the built-in flow control commands
- (while, foreach, if-else-endif). All the commands in the fitting mode
- can be abbreviated. It is worth mentioning that in the fitting mode
- the command line parsing is done by analyzing words separated by one
- or more blanks (space or tab), as in an interactive csh.
-
- The ``C-calculator mode'' is a language interpreter supporting most of
- C grammar except pointers. It also supports the complete
- double-precision C math library. Thus, recognized keywords cannot be
- abbreviated, and the different tokens need not be separated. Most of
- the C operators and keywords are understood and a few extra operators
- have been added. This mode does essentially all the possible
- calculations on variables or vectors. Functions and procedures can be
- defined. String variables, string comparison, addition, subtraction
- are also supported by C-calculator mode. This mode is accessed by the
- command `cmode'.
-
- Finally, the ``plotting mode'' is a channel talking directly to the
- plotting program of your choice. Therefore, FUDGIT can serve as a
- front end to any plotting program able to accept input from stdin.
- This way, vectors can be build from the calculator and then plotted by
- your favorite plotting program. The default plotting program is
- GNUPLOT.
-
- Refer to the User's Guide for a complete tutorial and a reference manual.
-
-