




Features
Ease of Use
 A rich graphical user interface lets you quickly tackle oneoff
problems.
 For more elaborate tasks, the intuitive command language makes
script writing easy. For example, to graph two data vectors x and y
against each other, just type "graph x y".
 Automatic scriptwriting mode will create a script based on your
GUI pointandclick actions. Write scripts without typing a single command!
 Data manipulation is easy with Extrema's automatic expression
evaluation. For instance, if you have 10,000 (x,y) data coordinates
stored in vectors x and y, you can instantly compute
each of their distances from the origin with "d = sqrt(x^2 +
y^2)".
 Simple, easytounderstand programming constructs allow you to
write code with little or no programming experience.
 The GUI gives you ALL the power of the lowlevel language, and
vice versa.
3D Graphing

Contour plots: colour, legend, area/volume tabulations, control over contour
label size, colour, separation, etc.

Density plots: derivatives, random point type, box type, colour filled regions, dithering
patterns with automatic or user defined patterns, diffusion type, profiles,
legend, area/volume tabulations, etc.
2D Graphing

Customized 2D line graphs, scatter plots,
horizontal or vertical bar charts, each with a large variety of type styles
and fonts of any size and color

Customized or automatic legends

Multiple axes with arbitrary axis positioning

Fill the area between data curves or fill individual
histogram bars

Logarithmic axes, to any base, including e

Axis scaling can be automatic or user set (including commensurate axes)

Labels can optionally follow the curves on rescaling a graph

Many plotting symbols, with control over size, colour and angle

Complete control over axis appearance (short/long
tic mark length and angle, separation between tic marks and axis labels,
axis angle, length and location, axis labels size, colour, font, number of
digits, etc.)
Data Reduction & Analysis

Differentiate/Integrate an arbitrary expression

Interpolate 1D or 2D data using various methods
(linear, Lagrange, weighted splines under tension,
FritschCarlson, etc.)

Smooth data using various methods (weighted splines under
tension, SavitzkyGolay filters, etc.)

Convolution and deconvolution of data

Integral transforms of arbitrary expressions

Fast Fourier Transforms and Inverse FFT's

Reorganize data (sort, step, roll, wrap, etc.)

Weighted (re)binning of 1D or 2D data into automatic or user
defined bins (specified by centres or edges)

Find multiple real roots of an expression

Recursive and nonrecursive digital filters

Manual or automatic determination of data
extrema using graphics cursor

Fit data with an arbitrary, nonlinear, expression
involving up to 25 variable parameters

Ellipse fitting

Calculation of parameters for leastsquares fit using
adjustable parameters
 User defined and named variables (scalars, vectors, matrices, strings, arrays of strings)

Full indexing on variables and expressions

Literal vectors may be specified as a list or a range

Boolean operators (<, >, &, etc.)

Array operators (inner/outer product,
matrix transpose, etc.)

Over 200 builtin functions including:
scalar type (Bessel, ClebschGordan, etc.);
array type (sum, product, loop, where, etc.);
string type (case, date/time, etc.)

Mathematical/character expressions may appear in
any suitable command parameter

Use character variables to substitute for complicated
expression substrings
Data Input/Output

Display the history of variables

Read data from binary or ASCII files by formats or space/tab/comma separated columns

Output data to binary or ASCII files by formats or in columns

Dynamic allocation of arrays

Digitize data from a displayed plot
Extrema's BuiltIn Language

Scripting capability with up to 20 nesting levels and with parameter passing

Script library of `super' commands

Nested looping, branching and conditional statements in scripts

Display messages, prompt for user input from within a script

Return to interactive mode from within a script,
and later resume script execution

Create a script interactively
General Graphics Utilities

Unlimited text capabilities for titles, labels, and annotations

Multiple windows within the graphing area

Any number of charts of any mixed type on a single picture

High quality graphics display

Interactive entry of lines, arcs, geometric figures, and text
Other Features

Comprehensive online documentation: instant help for any command, or
interactive browsing through help library

Keyword searching

Save/Restore an entire Extrema session, including graphics

Keep a journal file of all command input and message output

Dynamic input line recall buffers allow recall/edit of commands using the arrow keys






