Introduction

The program funct can be used to study real or complex functions $f(x)$ of one real variable $x$, and use them in geometry. It accepts commands given interactively by the user or programs that are sequences of commands. It can produce graphics on a X11 window, and files in various graphic formats.

funct uses the command interpreter library interpcom (see 1.2). It may be useful to read at least a part of the documentation of interpcom before using funct, especially chapters 4 ("Programming with the command interpreter") and 11 ("List of available commands"). Functions, or geometric objects, like points, lines, polygons, are created by appropriate commands and are given names which are used to refer to them in subsequent commands. funct can be used interactively and run programs.

funct can be built with several graphic libraries, in 4 ways :

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with the libplot library, which is a part of GNU-plotutils. It provides X11, Postscript, PNG, GIF and FIG formats.

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with the g2 library. It provides X11, Postscript, and PNG formats.

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with the allegro library for X11, and g2, gd for PNG and Postscript graphics.

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with the ggi library for X11, and g2, gd for PNG and Postscript graphics.