Differences

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--- matlab:introduction_to_matlab [2017/04/24 01:43] – mithat
+++ matlab:introduction_to_matlab [2021/12/07 19:11] (current) – [Documenting functions] mithat
@@ Line 3: / Line 3: @@
 ====== Introduction to MATLAB ======
 Mithat Konar\\
--04-23
+-04-26
 ===== What is it? =====
-  * A freaking huge and featureful graphing calculator
+  * A //high-level//, //interpreted// language and environment targeting scientific computing.
+  * A freaking huge, feature filled graphing calculator
   * Comprehensive
   * Expensive
@@ Line 33: / Line 34: @@
 ===== Variables =====
-  * MATLAB has only one numeric type.
+  * Numbers are double precision floats by default.
-  * Strings are OK too.
+  * Strings exist too.
     * Use single quotes.
     * For a literal single quote in a string, use two single quotes.
@@ Line 47: / Line 48: @@
 ===== Comments =====
-  * Use a percent sign.
+  * Use the percent sign.
 <code matlab>
-% like this
+% a single line comment
 a = 99; % this works too
 %{
-foo = 'This is a';
+foo = 'multiple line comments';
-baz = 'multiple line comment';
+baz = 'use curly brackets inside';
+qux = 'a pair of percent signs.';
 %}
 </code>
@@ Line 104: / Line 106: @@
 <code matlab>
 % separate matrix rows with ';'
 a = [1 2 3; 4 5 6; 7 8 9];
-c = [9 8 7; 6 5 4; 3 2 1];
+b = [9 8 7; 6 5 4; 3 2 1];
 </code>
@@ Line 111: / Line 114: @@
 <code matlab>
-% matrix multiplication
+r = 1.25 * a; % scalar multiplication
-r = a * b;
+r = a * b;    % matrix multiplication
+r = a .* b;   % elementwise multiplication
-% elementwise multiplication
+r = a ./ b;   % elementwise division
-r = a .* b;
-% elementwise division
-r = a ./ b;
 </code>
@@ Line 265: / Line 264: @@
 </code>
-Una línea:
+On one line:
 <code matlab>
 while n < 10,  y = y * n;  n = n + 1; end
@@ Line 277: / Line 276: @@
 </code>
-一条线
+On one line:
 <code matlab>
 for n = 0 : 0.5 : 2, disp(n); end
@@ Line 305: / Line 304: @@
 ===== User functions =====
+  * Functions can be defined in a ''.m'' file with a ''main'' function.
+    * Several functions in one file.
+    * Functions aren't shared.
   * Functions can be defined in files that also end in ''.m''
     * One function per file.
     * File name must match function name.
     * Functions can be called by any other ''.m'' file or interactively.
-  * Functions can be defined in a ''.m'' file with a ''main'' function.
-    * Several functions in one file.
-    * Functions aren't shared.
-===== Example function =====
+===== With "main" function =====
+  * Minimum syntax:
+<file matlab main.m>
+function main()
+  area1 = traparea(1, 2, 3);
+  disp(area1);
+end
+function area = traparea(a, b, h)
+  area = 0.5 * (a + b) * h;
+end
+</file>
+===== Stand alone function =====
   * Minimum syntax:((Recktenwald, Gerald. "MATLAB Functions -- Basic Features." MATLAB Functions -- Basic Features. Accessed April 30, 2016. http://web.cecs.pdx.edu/~gerry/MATLAB/programming/basics.html.\\
 All examples in in the "User functions" section are from Recktenwald.))
@@ Line 326: / Line 339: @@
 area1 = traparea(1, 2, 3);
 disp(area1);
-</file>
-===== With "main" function =====
-  * Minimum syntax:
-<file matlab my_script.m>
-function main
-  area1 = traparea(1, 2, 3);
-  disp(area1);
-end
-function area = traparea(a, b, h)
-  area = 0.5 * (a + b) * h;
-end
 </file>
 ===== Documenting functions =====
   * First comment block after first line is used to [[https://www.mathworks.com/help/matlab/matlab_prog/add-help-for-your-program.html|document functions]].
-  * What user sees when she types ''help //function-name//''.
+  * What user sees when they type ''help //function-name//''.
     * Only with single-function m-files.
 <file matlab traparea.m>