CD School House 9/CD School House 9.0 - Wayzata Technology (1994).iso/pc/dos/math/maplev/demo.in

Text File | 1992-01-07 | 12KB | 312 lines

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#                        A QUICK TOUR OF MAPLE V
#             Copyright (c) 1991 by Waterloo Maple Software

# Maple is an essential tool for anyone who needs to use or study
# mathematics. In the next few screens you will get a glimpse of a few of
# the over 2000 Maple functions and what they can do for you. While this
# Maple Demonstration runs only on an 80386 or 80486 based machine, all
# the Maple commands appearing in this Tour are part of Maple on all
# other platforms including the Macintosh and Unix systems. Only the user
# interface varies from platform to platform.

# This demonstration consists of a sequence of descriptive paragraphs
# and Maple commands (which appear after a prompt character). When a
# command appears, press Enter to execute it and display the answer.
# For example, press Enter now:

1 + 2;
# Maple is capable of a wide variety of numeric, graphic, and symbolic
# operations. Maple normally does rational arithmetic. Expressions are
# entered using a syntax similar to that of common programming languages
# such as BASIC, FORTRAN, or Pascal.


#                          NUMERIC CALCULATIONS

# To use Maple as a sophisticated calculator, simply enter the
# calculation you wish to perform on one or more lines. Some of the
# operators available are:  + add,  - subtract,  * multiply,  / divide, ^
# exponentiate, and sqrt() square root. For example:

32 * 12^4;
# Maple recognizes a wide variety of special operators including
# factorial, greatest common divisor, least common multiple, modular
# arithmetic, and so on:

20! - 12!;
# The most recent result (2432902007697638400) can be easily included in
# any subsequent calculation without having to type it. The double-quote
# character (") is used to refer to the last expression computed by
# Maple, in a manner analogous to the use of ditto marks in ordinary
# English. For example, this integer can be separated into its prime
# factors:

ifactor(");
# This result can be checked by multiplying it out:

expand(");
# Maple's normal mode of computation is exact arithmetic, in which there
# can be no roundoff or truncation errors:

(2^30 / 3^20) * sqrt(2);
# But Maple can also provide an approximation in the form of a decimal
# floating point value:

evalf(");
# Maple is capable of finding both finite and infinite sums:

sum((1+i)/(1+i^4),i=1..20);
# and Maple can do floating-point arithmetic to any desired precision:

evalf(",30);
# Maple can do complex arithmetic:

evalc((3+5*I)*(7+4*I));
# and compute numeric values for the elementary functions and many
# special functions and constants:

evalf(exp(1.0));
evalf(GAMMA(2.5));
evalf(Pi,40);

#                2-DIMENSIONAL AND 3-DIMENSIONAL GRAPHICS

# Maple supports both 2-dimensional and 3-dimensional graphics. The
# demonstration version supports only EGA or VGA display adapters. The
# full version also supports AT&T, CGA, Hercules, and MCGA displays, and
# EPSON, HP, IBM, Toshiba, and POSTSCRIPT printers.

# The Maple plot() command provides support for two-dimensional graphs of
# one or more functions specified as expressions, procedures, parametric
# functions, or lists of points. For example, the following shows the sum
# of two sine curves. Press the Escape key when you are finished viewing
# the plot.

plot(sin(x)+sin(5*x),x=-1..4);

# The plot3d() command can plot functions of two variables, as well as
# parametric curves or surfaces. The following example plots a simple
# function of two variables:

# Once the plot is displayed, you can press the F10 key to display a menu
# that lets you manipulate the plot in various ways. For example,
# pressing F10 to display the menu, followed by V to invoke the View
# item, will let you rotate the plot. After rotating to the desired
# orientation (using the arrow keys), press Escape (to return to the menu),
# and then D to redraw the plot in the new orientation. Other
# manipulations you can perform include adding axes, changing the color
# scheme, changing perspective, and adding a title. The full version also
# lets you create a printed copy of the graph (about 10 different types
# of printers and plotters are supported), or save an image of the graph
# in a file for importing into other programs. Press the Escape key when
# you are finished viewing the plot.

plot3d(sin(x)+sin(5*y),x=-1..4,y=-1..4);

# Maple also provides a package of functions to generate more complex
# plots easily. This package is called plots, and is loaded using the
# with() command. The package includes functions for plotting in
# spherical and cylindrical coordinates, plotting matrices and complex
# functions, points in space, and many other specialized graphical
# representations. One function in this package (included in the Maple
# Demonstration) is tubeplot(), which plots a parametric curve through
# space, with the thickness of the curve defined by a constant or
# expression. For example (be sure to press the Enter key at the end of
# each line):

with(plots):
tubeplot([-10*cos(t)-2*cos(5*t)+15*sin(2*t),
   -15*cos(2*t)+10*sin(t)-2*sin(5*t),
   10*cos(3*t)], t=0..2*Pi, radius=3*cos(t*Pi/3));


#                          ALGEBRAIC OPERATIONS

# Maple is most powerful when working as a symbolic or algebraic
# calculator. First, an expression is entered, and then Maple echoes:

(x+y)^3*(x+y)^2;
# In the next four steps the expression is multiplied out, cubed,
# expanded a second time and finally factored:

expand(");
"^3;
expand(");
factor(");
# Maple  provides a basic form of simplification for those expressions
# that lie in the domain of rational  functions. The result is expressed
# in the form p/q with the common factors cancelled:

normal((x^3-y^3)/(x^2+x-y-y^2));
# More complex simplifications can be accomplished using the simplify()
# command. By using the numer() and denom() commands you can even operate
# on portions of an expression.

# In some cases it is useful to define an expression so that it can be
# referred to later. Here e1 is set equal to the quotient of the
# expansion of two expressions. e1 is then simplified:

e1 := expand((41*x^2+x+1)^2*(2*x-1)) / expand((3*x+5)*(2*x-1));
normal(e1);
# The convert() operation allows you to convert many types of expressions
# into specific forms. The following example converts an expression into
# a partial fraction:

(3*x+5) / (x^2-3*x+2);
convert(",parfrac,x);
# Using the Maple proc() function allows for the definition of
# functions:

f1:= proc(x) x^2 end;
# Numeric or symbolic values of the function can be obtained:

f1(2);
f1(a+b);
# Functions of several variables or functions that contain more than one
# rule can be defined:

f2:= proc(x) if x > 3 then x^2 else if x <= 3 then x-5 fi fi end;
f2(0);

#               SOLVING EQUATIONS AND SYSTEMS OF EQUATIONS

# You can use Maple to solve algebraic equations (or expressions assumed
# to be equal to zero):

x^3-1/2*x^2*a+13/3*x^2-13/6*x*a-10/3*x+5/3*a;
solve(",x);
# Maple can also solve systems of equations:

eqn1 := x + 2*y + 3*z + 4*t + 5*u = 6;
eqn2 := 5*x + 5*y + 4*z + 3*t + 2*u = 1;
eqn3 := 3*y + 4*z - 8*t + 2*u = 1;
eqn4 := x + y + z + t + u = 9;
eqn5 := 8*x + 4*z + 3*t + 2*u = 1;
solutions1 := solve({eqn.(1..5)}, {x,y,z,t,u});
# You can also choose to solve an under-constrained set of equations:

solutions2 := solve({eqn.(1..4)}, {x,y,z,t,u});
# Since exact symbolic arithmetic is performed, Maple can recognize
# equations that are linearly dependent. The set of under-constrained
# equations (eqn1 ... eqn4) produces a set of solutions in which the
# equation t = t appears. This means that t can take arbitrary values.

# We can check the solutions produced by substituting the values given
# for x, y, z, t, and u into the original set of of equations.
# This set of invariants confirms the validity of the answer that was
# computed by the solve command:

subs(solutions2,{eqn.(1..4)});

#                                CALCULUS

# Maple is an outstanding tool for working with calculus. You will be
# able to compute limits as well as integrate and differentiate:

f := (x^2-2*x+1)/(x^4+3*x^3-7*x^2+x+2);
limit(f,x=1);
f := (2*x+3)/(7*x+5);
limit(f,x=infinity);
f := x*sin(x) + 2*x^2;
diff(f,x);
int(",x);
# A wide variety of examples showing the use of Maple in the study of
# calculus can be found in Maple for the Calculus Student, A Tutorial by
# Wade Ellis and Ed Lodi. This inexpensive supplement is available from
# Brooks/Cole. The following example is from Maple for the Calculus
# Student:

#       Maple can solve many differential equations as explicit
#       functions (in closed form). When necessary, it can give
#       approximate numerical solutions to such equations. In addition,
#       Maple provides a Laplace transform capability that can be used
#       in solving differential equations.

#       Maple can easily solve the differential equation y' = y:

dsolve(diff(y(x),x) - y(x) = 0, y(x));

#                           MATRIX OPERATIONS

# Maple comes with a wide variety of special packages. Among these is the
# Linear Algebra Package. This package has a complete set of commands for
# working in linear algebra and other areas that involve matrices,
# arrays, and determinants. Loading the Linear Algebra Package is
# accomplished as follows:

with(linalg):

# Once the package is resident, many additional commands are available
# (only a few of them are available in the Demonstration). Here we define
# a 2-by-2 symbolic array:

M := array(1...2,1...2);
# Then find its determinant:

det(M);
# Next, let Maple define a special matrix, find the inverse of that
# matrix, and finally multiply those matrices together to obtain the
# identity matrix as a check:

H := hilbert(5);
H1 := inverse(H);
multiply(H,H1);
# In the following three commands, Maple will generate a 3-by-3 matrix
# that has some symbolic entries, take its determinant, and finally
# factor that determinant:

V := vandermonde([u,v,w]);
d := det(V);
factor(d);

#                              ON-LINE HELP

# Maple contains a complete on line help system. The following command
# will display an index of Maple command categories (when you are done
# looking at the help file, press the Escape key):

?index

# The ? command invokes the help browser to display information about the
# selected topic. Users of older versions of Maple will be interested in
# knowing that the ? command does not require reserved words, symbols, or
# assigned names to be quoted, as the help() procedure requires.

# When the browser is displaying information about a topic, you can
# browse through this information using the cursor movement keys. Lines
# containing Maple statements can be selected, and pasted into your Maple
# session and executed. The full version of Maple also lets you edit
# these lines before pasting them into the session.

# The help system includes the complete definition of syntax and
# description of function, as well as examples. Here are two more
# examples of on-line help (remember to press Escape when you are done
# with each one):

?ifactor
?plot3d

# If you do not know the topic you wish to read about, pressing F1 during
# your Maple session will display a hierarchy of topics from which you can
# select. The demonstration version supports this feature, but the
# information for all but three of the topics is not included on the
# demonstration diskette. Try pressing F1 now.

# ------------------------------------------------------------------------
#              For more information, or to order, contact:

#                     Brooks/Cole Publishing Company
#                         511 Forest Lodge Road
#                        Pacific Grove, CA 93950

#                        To order: [phone]
#                Information and Support: [phone]
#                          Fax: [phone]

#                E-mail: [e-mail]
# ------------------------------------------------------------------------

# You can now try some more Maple commands (you can recall and edit earlier
# commands using the arrow keys), or press F3 to return to DOS.