/* [wxMaxima batch file version 1] [ DO NOT EDIT BY HAND! ]*/
/* [ Created with wxMaxima version 23.03.0-DevelopmentSnapshot ] */
/* [wxMaxima: title   start ]
10 minute (wx)Maxima tutorial
   [wxMaxima: title   end   ] */


/* [wxMaxima: comment start ]
Welcome to wxMaxima! In this introductory tutorial you will
learn the basics of wxMaxima and Maxima. Maxima is a CAS
(Computer Algebra System) similar to systems like Mathematica,
Maple and others. Maxima, however, is a commandline application,
which makes it a bit harder to use than its younger cousins.
Here is where wxMaxima comes in - it's a GUI (Graphical User
Interface) for Maxima, made to make using Maxima simpler and
more enjoyable.

Let's start with some simple calculation examples! Below is 
an input cell with a simple addition. Place the cursor in it
and press SHIFT-ENTER to evaluate it.
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
1 + 1;
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
If you didn't get any errors, your Maxima is configured properly.
If you did get an error, you should check wxMaxima configuration or
visit wxMaxima website (https://wxmaxima-developers.github.io/wxmaxima/) for
instructions on how to setup wxMaxima and Maxima properly!

Assuming you've delt with your problems, let's do some more
calculations (again - place the cursor in the input cell below
and press SHIFT-ENTER to evaluate the code)!
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
5!;
% * 10;
%o1 * 100;
1 / 3;
1.0 / 3.0;
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
In the input cell above, we've sent 5 "lines" to Maxima. Each line
must end with a ";" or a "$". In case the line ends with a ";", Maxima
will show the result of the line, while results of lines ending
with "$" will be suppressed. The "$" comes in handy when doing longer
calculations. Note also that the result of "1/3" and "1.0/3.0" differ.
That's because Maxima, unlike numerical matrix packages (Matlab etc.),
tries to keep calculations precise - it does not evaluate 
expressions like 1/3 or sqrt(2) unless asked to. In "1.0/3.0" we used
floating point numbers, so Maxima didn't leave expression unevaluated.

We can, however, tell Maxima we want a floating point approximation
of an expression. Evaluate the cell below and observe results.
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
sqrt(2 * %pi);
float(%);
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
In line "float(%);" we used the "%" symbol. This symbol always holds
the result of the last evaluated line. Numbered symbols "%o1", "%o2"
... hold the results as they appear when input cells are evaluated.
We can also store, not only numbers, but whole expressions, in variables.
Use "variable_name: value;" form to store value into "variable_name".
Evaluate the cell below and observe.
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
radius: 10 $
height: 100 $
area: %pi * radius^2;
volume: area * height;
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
Let's evaluate the last result numerically:
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
float(%);
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
So far we've only used Maxima as a simple calculator. Now let's try
some things not possible with a calculator. Indefinite and definite
integrals:
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
integrate( sin(x), x);
integrate( sin(x), x, 0, %pi);
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
Let's define a function, evaluate it and integrate it!
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
f(x) := x^2 + a$
f(5);
f(5), a = -5;
integrate( f(var), var );
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
Sometimes Maxima needs additional information to evaluate an expression
and asks us a question. A cursor should appear automatically, indicating
you need to answer a question. If it doesn't, write an answer below the
cell and send it to Maxima with SHIFT-ENTER. Note: instead of answering
with "positive;", you can only type "p". Below is an integral with
a question:
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
integrate( 1 / (x^2 + a), x);
/* [wxMaxima: input   end   ] */
/* [wxMaxima: question  start ] */
<math><mrow lisp="mtext"><mrow lisp="mtext"><st>Is </st><mi>a</mi><st> positive or negative?</st></mrow></mrow></math>
/* [wxMaxima: question  end   ] */
/* [wxMaxima: answer  start ] */
p;
/* [wxMaxima: answer  end   ] */
/* [wxMaxima: question  start ] */
<math><st>Is </st><mi lisp="*var-tag*">a</mi><st> positive or negative?</st></math>
/* [wxMaxima: question  end   ] */
/* [wxMaxima: answer  start ] */
p;
/* [wxMaxima: answer  end   ] */
/* [wxMaxima: question  start ] */
<math><st>Is </st><mi>a</mi><st> positive or negative?</st></math>
/* [wxMaxima: question  end   ] */
/* [wxMaxima: answer  start ] */
p;
/* [wxMaxima: answer  end   ] */
/* [wxMaxima: autoanswer    ] */

/* [wxMaxima: comment start ]
We can also inform Maxima beforehand using the function "assume". To
revert an assumption, use "forget".
(Note: to get help on any function, just click on the function name
and press F1. Try it.)
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
assume(a > 0)$
integrate( 1 / (x^2 + a), x);
forget(a > 0)$
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
Now that you've learned the basics, it's time for some general
mathematical examples! Remember: if you want to know more about
a specific function, click on it and press F1.

Solving equations using solve:
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
solve(a*x^2 + b*x + c = 0, x);
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
Linear algebra. Use "matrix" to create matrices. Matrices can contain
non-number expressions. Use "invert" to calculate an inverse and "."
for matrix multiplication.
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
A: matrix([1,-1],
          [1,sin(c)]);
B: invert(A);

A.B;
ratsimp(A.B);
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
In the last line we used "ratsimp" to simplify the result of "A.B".
Maxima has a lot of different simplification functions, depending on
what kind of simplification you want. Simplification is a complex
topic and if you don't know anything about it, using "ratsimp" may
be your best shot.

Let's do a 2D and a 3D plot!
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
wxplot2d([sin(x), cos(x)], [x,0, 2*%pi]);
wxplot3d( exp(-x^2 - y^2), [x,-2,2],[y,-2,2]);
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
Let's try differenciation using "diff" function.
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
f(x) := x^2 $
diff(f(x), x);
g(y) := sin(y)$
g(f(x));
diff( g(f(x)) , x);
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
Yes, Maxima knows about the chain rule!

And for the end, let's solve an ODE of second order:
y''(t) + omega^2 * y(t) = 0
   [wxMaxima: comment end   ] */


/* [wxMaxima: input   start ] */
assume(omega > 0);
ode2( 'diff(y, t, 2) + omega^2 * y = 0, y, t );

ic2(%, t = 0, y = amp, 'diff(y,t) = 0 );
/* [wxMaxima: input   end   ] */


/* [wxMaxima: comment start ]
You should now start exploring (wx)Maxima on your own. Remember 
to press F1 often, if you want Maxima to help you solve your 
mathematical problems!

Enjoy using Maxima and wxMaxima!
   [wxMaxima: comment end   ] */



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"Created with wxMaxima 23.03.0-DevelopmentSnapshot"$
