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Id: 11951
System Name: fussy
Name: fussy
Group Type: Official GNU software

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This software is part of the GNU Project.

GNU fussy

The GNU fussy program implements a scripting language with an algorithm for automatic error propagation of random measurement errors in an arbitrary mathematical expression.  The program can be used as a simple interactive calculator with error propagation.  Mathematical expressions can be implemented as a collection of sub-expressions, as sub-program units (functions or procedures) or as single atomic expressions.  Sub-expressions can be assigned to temporary variables which can then be used to write the final expression.  The interpreter is internally implemented as a virtual machine for efficient run-time performance.  The GNU fussy library provides an API to call the interpreter as a function in C/C++/FORTRAN application. 

The scripting syntax of fussy is similar to the C programming language. It is easy to use fussy with minimal learning, particularly for those familiar with programming in C. In its simplest form, GNU fussy interpreter can be used interactively as a simple calculator with the added feature of automatic error prorogation (see syntax for simple expressions, sub-expressions, and functions/procedures). E.g.


   >sin(x)/cos(x)            /* Compute tan(x) as sin(x)/cos(x) */
       1.55741 +/-    0.34255

   >tan(x)                   /* Direct computation of tan(x) */
       1.55741 +/-    0.34255

   >s:=sin(x);c:=cos(x);     /*Construct two variables s & c dependent on x*/

   >s/c                      /* Compute tan(x) using two dependent variables */
       1.55741 +/-    0.34255

   >s2=s;                    /* Convert s to an independent variable s2 */

   >s2/c                     /* Compute tan(x) with two independent variables.
                                Error propagates differently */
       1.55741 +/-    0.26236

Registration Date: Tue 30 Jul 2019 08:32:30 PM UTC
License: GNU General Public License v3 or later
Development Status: 5 - Production/Stable


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