Differences

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--- matlab:introduction_to_matlab [2016/05/01 22:58] – [Some useful functions] mithat
+++ matlab:introduction_to_matlab [2019/05/07 00:53] – [What is it?] mithat
@@ Line 3: / Line 3: @@
 ====== Introduction to MATLAB ======
 Mithat Konar\\
--04-30
+-04-26
 ===== What is it? =====
-  * A freaking huge graphing calculator
+  * A //high-level//, //interpreted// language and environment targeting scientific computing.
+  * A freaking huge, feature filled graphing calculator
   * Comprehensive
   * Expensive
@@ Line 32: / 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.
-    * Two single quotes for a literal single quite in a string.
+    * For a literal single quote in a string, use two single quotes.
   * Lots of [[https://www.mathworks.com/help/matlab/data-types_data-types.html|other types]].
   * Ending with a semicolon suppresses output to console.
@@ Line 46: / 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 103: / 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 110: / 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 149: / Line 149: @@
 % create a surface plot
-surf(data);
+surf(z);
 </code>
@@ Line 253: / Line 253: @@
   * ''switch_expr'' doesn't need to be a number
-  * ''case'' can match multiple vales
+  * ''case'' can match multiple values
   * No "break" is needed.
@@ Line 264: / Line 264: @@
 </code>
-Una línea:
+On one line:
 <code matlab>
 while n < 10,  y = y * n;  n = n + 1; end
@@ Line 276: / Line 276: @@
 </code>
-一条线
+On one line:
 <code matlab>
 for n = 0 : 0.5 : 2, disp(n); end
@@ Line 295: / Line 295: @@
   * ''a || b'': short-circuit logical OR (scalars only)
   * ''a & b'', ''and(a, b)'': element-wise logical AND (scalars or vectors)
-  * ''a | b'', ''or(a, b)'': element-wise logical OR(scalars or vectors)
+  * ''a | b'', ''or(a, b)'': element-wise logical OR (scalars or vectors)
   * ''~a '', ''not(a)'': logical NOT
   * ''xor(a, b)'': logical EXCLUSIVE OR
@@ Line 304: / 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 =====
-  * 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.))
-<file matlab traparea.m>
-function area = traparea(a, b, h)
-  area = 0.5 * (a + b) * h;
-end
-</file>
-<file matlab calc_trap_area.m>
-% Uses traparea function defined in traparea.m
-area1 = traparea(1, 2, 3);
-disp(area1);
-</file>
 ===== With "main" function =====
@@ Line 338: / Line 324: @@
   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.))
+<file matlab traparea.m>
+function area = traparea(a, b, h)
+  area = 0.5 * (a + b) * h;
+end
+</file>
+<file matlab calc_trap_area.m>
+% Uses traparea function defined in traparea.m
+area1 = traparea(1, 2, 3);
+disp(area1);
 </file>