html, matlab & delphi aleksey charapko 11/3/13. html markup language created at cern for...
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HTML, MATLAB & Delphi
Aleksey Charapko11/3/13
HTML
Markup Language Created at CERN for scientific purposes No executable code Controls the “look” of the document
HTML
Widely used on the Internet Many versions exist
Most current version is HTML5 Still not an official standard Widely used Not fully supported
HTML
Basic structure of HTML is a tag Tags define elements placed on the page
Tag is a markup command Looks like a text inside angled braces
Ex. <html>, <p>
Tags are often paired Opening and closing tags
Ex. </html>, </p>
HTML
Has a number of defined tags All non tags are displayed on the screen as text
Ignores double white spaces and new lines New lines are markup
Tags exists for new lines
HTML
Parsing Many parsers exists – Browsers HTML is parsed into DOM (Document
Object Model) Tree structure, can be manipulated with
JavaScript
HTML Example<!DOCTYPE html><html>
<head><title>Example 0</title>
</head><body>
<p>HTML Example #0
</p><p>
This is a correct HTML file</p>
</body></html>
HTML Parsing
Most parsers are not “Strict” Allow for errors in HTML Have error correction mechanisms Degrades readability
Makes developers careless
HTML Tag Soup
Tag Soup:
<!DOCTYPE html><html>
<head><title>Example 1</title>
</head><body>
<p>This is a tag soup <strong>example</p>
</strong><p>
In this example child tag closes after the parent tag</p>
</body></html>
HTML Parsing
How much of HTML is correct? validator.w3.org
www.unf.edu? www.unf.edu/~ree/ ? www.google.com ?
HTML
Time Proven 20+ years
Easy to use Hard to follow standards
MATLAB
Scientific language Used in research, engineering and education
Interpreted Procedural OOP
MATLAB
Comes bundled with MATLAB software Available for Windows, Linux, Mac OS Mobile app availability
Runs calculations in a cloud.
MATLAB Matrices
MATrix LABoratory Matrix manipulation 2x3 Matrix:
MyMatrix = [4 5 7; 3 8 2]
Matrix Operations Must adhere to rules of matrix operations
MATLAB MatricesmyMatrix = [4 5 7; 3 8 2];myOtherMatrix = [1 2 3; 9 8 7];ans = myMatrix * myOtherMatrix;
“Inner matrix dimensions must agree” error
myMatrix = [4 5 7; 3 8 2];MyOtherMatrix2 = [1 2; 9 8; 3 4];ans = myMatrix * MyOtherMatrix2
Result:
ans =
70 76 81 78
MATLAB Matrices
Matrix is not an array Can hold only numeric data types
MATLAB supports cells which can hold non-numeric data types
MATLAB
Supports integration with other languages C/C++, Fortran, etc.
Requires special MATLAB function to be written
Java Can interface straight form the MATLAB
code
MATLAB & Java
Seamless integration with Java
xmlObj is Java object getChildNodes is method ob xmlObj
children is another Java Object
xmlObj = xmlread('file.xml')children = xmlObj.getChildNodes;children = children.item(0);
MATLAB Data Types
Implicit Data types Coercion is widespread Can implicitly convert from MATLAB data
types to non-MATLAB types In some cases explicit conversion is required
MATLAB
Many more interesting features:function [x, y] foo (a)
x = 2 * a;if x > 10
y = a + 5;else
y = 5end
end
Multiple returns No semicolon – prints the output Many structures end with “end” keyword
MATLAB
Intuitive and easy to read Somewhat confusing when accessing other
languages Somewhat slow
Especially when allocating memory Have been in use for many years
Delphi
Object Oriented Dialect of Object Pascal
Object Pascal originally developed by Apple
Delphi IDE
Delphi
Based On Pascal Has many pascal features
begin... end blocks := assignment operator common for languages
of the era
Delphi
Strongly typed Flexible with Enumerated types
Can define sets of primitives of Enums Sub-ranges of Primitives or Enums
Delphivar SmallNums : Set of 0..55; // Set of the 56 set membersbegin // We have a range of 0 to 55 values that we can set SmallNums := [3..12,23,30..32]; // Set some of the members onif 12 in SmallNums then ShowMessage('12 is in SmallNums') else ShowMessage('12 is NOT in SmallNums');if 13 in SmallNums then ShowMessage('13 is in SmallNums') else ShowMessage('13 is NOT in SmallNums')
Result:12 is in SmallNums13 is NOT in SmallNums
Delphi
Delphi does not provide a garbage collection Programer responsible for memory
deallocation Supports functional programming
No variables/objects Less memory leaks
Delphi RAD
Often used for RAD and Prototyping Rapid Application Development
Delphi IDE has tools for RAD Languages facilitates RAD
Modular structure Verbose declarations Easy to read code
Delphi
Easy to read Yet hard to write
Fast to develop Have been in use for 20+ years