Learn To Program: December 2010

Friday, December 31, 2010

Reading File In Python

To read a text file, use:
fp = open("file.txt","r");
print fp.read()

For writing to a file, use:
fp = open("data.txt","w");
write("Hello World");
fp.close();

Monday, December 27, 2010

Saturday, December 25, 2010

Batch Basic

Batch file is a file that consift of DOS command. What you can do in command prompt, will also can be done in batch file. Type this code in hello.bat, and then execute it with

C:\hello.bat lady gaga

@ECHO OFF

ECHO hello, %1 

To make a variable, type:

SET name=Lady Gaga

echo %name%

PAUSE

IF Statements:

@ECHO OFF

SET a=luna

SET b=luna

IF %a%==%b% GOTO luna

ECHO Sorry, Lady!

:luna

ECHO You may win, Luna!

Thursday, December 23, 2010

Procedure In Pascal

Here's a code on how write a procedure in Pascal:

Without Parameters

Program UsingProc;

uses wincrt;

procedure hello;

var

    name : string;

begin

    name := 'lady gaga';

    writeln(name);

end;

begin

    hello;

end.

With Parameters:

Program UsingProcParam;

uses wincrt;

procedure hello(name : integer);

begin

    writeln(name);

end;

begin

    hello('lady gaga');

end.

Looping In Pascal

Here's a code on how to loop over a number of times;

For Loop:

Program forLoop;

uses wincrt;

var

    i : integer;

    c : char; 

begin

    for i := 0 to 100 do

    begin

        writeln(i,'. Holla World');

    end;

     writeln('==========================');

    for i := 100 downto 10 do

    begin

        writeln(i,'. Holla World  Again');

    end;

    writeln('===========================');

    for c := 'a' to 'z' do

    begin

        writeln(c,'. characters');

    end;

end.

While Loop:

Program  whileLoop; 

uses wincrt;

var

    i : integer;

begin

    i := 0;

     while i<100 do

    begin

         writeln(i,'. Less than 100');

        i := i+1;

     end;

end.

Repeat Until

Program untilLoop;

uses wincrt;

var

    i : integer;

begin    

    i  := 1; 

    Repeat

         writeln(i,'. Holla World');

        writeln('This  holla comes from turbo pascal');

        i := i + 1;

     until i = 100;

end.

Variable In Pascal

Program Lady;

uses wincrt;

var

    name   : string;

    female : boolean;

    age    : integer;

    weight : real;

begin

    name := 'Lady Gaga';

    female := true; 

    age := 23;

    weight := 49.89

    writeln('Personal Data');

    writeln('Name: ',name);

    writeln('Female: ',female); 

    writeln('Age: ',age);

    writeln('Weight: ',weight);

end.

To create an array variable, use:

var

    i : Array[0..9] of Integer;

    names : Array[0..4] of string;

    names : Array['A'..'F'] of string;

MySQL Giving Privileges To User

Give all privileges to 'luna'@'localhost':

mysql> GRANT ALL PRIVILEGES ON *.* TO 'luna'@'localhost' 

       WITH GRANTS OPTION;

Query OK, 0 rows affected (0.00 sec)

To show what the grant of a specified user, please type:

mysql> SHOW GRANTS FOR 'luna'@'localhost';

+------------------------------------------+
| Grants for luna@localhost |
+------------------------------------------+
| GRANT USAGE ON *.* TO 'luna'@'localhost' |
+------------------------------------------+
1 row in set (0.00 sec)

To give some grants, please type:

mysql> GRANTS SELECT, UPDATE, INSERT, DELETE, CREATE, DROP ON

       bankAccount.* TO 'luna'@'localhost';

Query OK, 0 rows affected (0.01 sec) 

To give some grants for a table, type:

mysql> GRANTS SELECT, UPDATE, INSERT, DELETE, CREATE, DROP ON

       customer.data TO 'luna'@'localhost';

Query OK, 0 rows affected (0.01 sec)

MySQL - Basic User Administration

The most basic type is:

mysql> CREATE USER 'luna'@'localhost';

Query OK, 0 rows affected (0.03 sec)

When password is needed, type:

mysql> CREATE USER 'luna'@'localhost' IDENTIFIED BY 'password';

Query OK, 0 rows affected (0.00 sec)

To remove a user, type:

mysql> DROP USER 'luna'@'localhost';

Query OK, 0 rows affected (0.00 sec)

Looping In Jython

>>> for i in range(3):

...     print i

0

1

Method In Jython

Here's a code that much like Python:

>>> def getLol():

...     print "Hello, Lol"

...

>>> getLol()

Hello, Lol

Class In Jython

Here's a code on how to define a class in Jython:

>>> class Hello:

...    def __init__(self,name="no name"):

...        self.name = name

...    def greeting(self):

...        print "Hello, ",self.name

...

>>> luna = Hello("Luna Maya")

>>> luna.greeting()

Hello, Luna Maya

Create Cookie In PHP

Here's a code on how to create cookie:

<?php

setcookie("name","lady gaga");

?>

And here to retrieve it:

<?php

echo $_COOKIE("name");

>?

To get all variable in cookies:

<?php

print_r($_COOKIE);

>?

Wednesday, December 22, 2010

Reading Text Files In Jython

>>> file = open("data.txt","r");

>>> for line in file.readlines():

...    print line

...

Holla the world

This come from text file

>>> file.close()

Swing Application From Jython

>>> from javax.swing import *

>>> def hello():

...     frame = JFrame("Holla, Jython")

...     frame.setSize(400,300)

...     frame.setLocation(200,100)

...     frame.show()

...

>>> hello()

First Script In Jython

To get Jython, please download it from Jython web site. After you download, you need to install it by command:

C:\java -jar jython_installer.2.2.1.jar

After the installation completes, please move to jython\bin directory and run jython.bat
C:\jython\bin\jython.bat

>>> print "Hello, Jython"

Hello, Jython

>>> from java.util import Vector

>>> v = Vector()

>>> dir(v)

>>> v.add('larry page')

>>> v.add('barack obama')

>>> v.add('bill gates')

>>> for value in v:

>>>     print v

larry page

barack obama

Publish Post

bill gates

Swing JRadioButton

To use this component, it's needed to use ButtonGroup:

import java.awt.*:

import javax.swing.*;

public Main{

   public static void main(String[] args){

        JFrame frame = new JFrame("Radio Button");

        JRadioButton rbApel = new JRadioButton("Apel");

        JRadioButton rbNanas = new JRadioButton("Nanas");

        JRadioButton rbJambu = new JRadioButton("Jambu"):

        ButtonGroup group = new ButtonGroup();

        group.add(rbApel);

        group.add(rbNanas);

        group.add(rbJambu);

        frame.add(rbApel);

        frame.add(rbNanas);

        frame.add(rbJambu);

        frame.setSize(400, 300);

        frame.setLocation(200, 100);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

}

}

Swing JCheckBox

import javax.swing.*;

import java.awt.*;

public Main{

    public static void main(String[] args){

        JFrame frame = new JFrame("CheckBox Application");

        JCheckBox cbJambu = new JCheckBox("Jambu");

        JCheckBox cbNanas = new JCheckBox("Nanas");

        JCheckBox cbApel = new JCheckBox("Apel");

        frame.add(cbJambu);

        frame.add(cbNanas);

        frame.add(cbApel);

        frame.setSize(400, 300);

        frame.setLocation(200, 100);

        frame.setDefaultCloseOPeration(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

}

}

Swing JEditorPane

This component can be made to load a text string or other. For file you can use: file:\\d:\\data.txt

import javax.swing.*:

public class Main{

    public static void main(String[] args){

        JFrame frame = new JFrame("JEditorPane Application");

        JEditorPane editPane = new JEditorPane();

        try{

            editPane.setPage("http://google.com");

        }catch(Exception ex){

            ex.printStackTrace();

}

        frame.add(editPane);

        frame.setSize(400, 300);

        frame.setLocation(200, 100);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

}

}

Swing JTabbedPane

Here's a code on how to show about JTabbedPane: Layout for tabbed pane is BorderLayout by default.

import javax.swing.*;

public class Main{

    public static void main(String[] args){

        JFrame frame = new JFrame("Tab Pane Application");

        JTabbedPane tabPane = new JTabbedPane();

        tabPane.addTab("General", new JButton("Exit")); 

        tabPane.addTab("Configuration");

        tabPane.addTab("Advance");

        frame.add(tabPane);

        frame.setSize(400, 300);

        frame.setLocation(200, 100);

        frame.setDefaultCloseOporation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

}

}

attr jQuery

Here's a bit of code on how to use attr:

var id = $('#satu').attr('id');

$('#dua').attr('id','lola');

$('#tiga').attr({'id':'empat','class':four','title':
'A Sample Of Text'}); // Object literal

css jQuery

To get the value, just type:

var color = $('#satu').css('background-color'); // get the value

$('#dua').css('background-color','red');        // set the value

$('#tiga').css({'color':'blue', 'font-size':'24px',
'background-color':'lime'});

jQuery Ajax - Save And Receive Data

Here's a code on how to send some data to the server and then notify the user that the saved data has completes:

$.ajax({

    type: "POST",

    url: "some.php",

    data: "name=lady&city=ny",

    success: function(msg){

alert('Data saved: '+msg);
}
});

Ajax In JQuery

Here's a code on how to get to ajax through jQuery:

$.ajax({

    data: 'test.html',

    success: function(data){

        $('#satu').text(data);

        alert('Load data successfully'); 

    }

});

Invoking Java From Matlab

You can build a Java application using Matlab:

>> java

>> f = javax.swing.JFrame('A Java Application');

>> f.setSize(400,300);

>> f.setLocation(200, 100);

>> f.setVisible(true);

Then you can add some attribute

>> layout = java.awt.FlowLayout();

>> f.getContentPane().setLayout(layout);

>> bExit = javax.swing.JButton("Exit");

>> f.getContentPane().add(bExit);

Defining Function In Matlab

Firstly, type this code and then save it - addTwo.m

function output = addTwo(input)

% This function will add the input with 2

output = 2 + input;

In Matlab interactive mode, type:

>> addTwo(3)

ans 5 

The function also can have more than one input and output arguments. Save this code to addThen.m:

function [add,dot] = addThen(input)

% This function will add and also will multiply 

% the input arguments.

add = input + input; 

dot = input * input;

Then in Matlab IDE, type

>> [a,b] = addThen(4)

a = 8

b = 16

If Else In Matlab

Type to test:

>> sleep = true;

>> if sleep

disp('Do sleep');

end

Do sleep

>> a = 2; 

>> if a>3

disp('Nothing');

else

disp('Do sleep')

end

Do sleep

Looping In Matlab

For do looping in Matlab, type:

>>  for i=0:20    % do looping for 0 till 20

disp(i)

end

>> for i=0:2:20   % do looping for 0  till 20 step 2

disp(i)

end

For while looping, do:

>> i = 0;

 >> while (i<10)

disp(i)

 i = i + 1;

end

Basic Graphics In Matlab

To create a graphics, type:

>> figure

>> x = 0:0.1:2*pi;

>> y = sin(x);

>> plot(x, y);

Miscelaneous commands:

>> close       % Close the active graphics window

>> close all   % Close the graphics window

>> clf         % Clear the window from the graph

>> hold on     % Keep the line in the previous display

>> hold off    % Lose the line in the previous display

>> grid        % Toggle for grid

>> cla         % Clear axis

>> box         % Toggle box
>> rotate3d    % Make the graph so can moving like a 3D objects

Data Analysis Using Matlab

Creating a matrix by type:

>> data = [2 3;

           4 5;

           8 3];

>> max(data)   

8 5

>> min(data)

2 3

>> mean(data)

4.6667 3.6667

>> median(data)

4 3

>> sort(data)

2 3

4 3

8 5

>> sum(data)

14 11

>> data<5

1 1

1 0

0 1

Matrics In Matlab

To create a matric, type:

>> data = [1 2;

           3 4]  

>> data(1,2) % Get the cross of the 1st row and the 2nd column

2 % var(row, col)

>> data(end,end) % Get the end of row and column

>> data(1:2,1) % Get elements cross at rows 1 till 2 and col 1

>> data(1:2,1:2) % Get rows 1 till 2 and col 1 till 2

1 2                % var(r1:r2, c1:c2)

3 4 % r1:r2 = row1 till row2

>> data(:,1)    % Get all rows at col 1

1

3

>> data(1,:) % Get all rows at row 1
1 2

>> data(:) % Get all elements in consecutive order

Detele rows or columns:

>> data(1,:)    % Delete all elements at the first row

>> data(:,1) % Delete all elements at the first column

Generating built in matric style:

>> zeros(r,c)    % Creating zero matrix by r and c dimension

>> magic(d)      % Creating random matrix by d and d dimension

>> ones(r,c)     % Creating 1 matrix by r and c dimension

>> rand(r,c)     % Creating random matrix by r and c dimension

>> randn(r,c)    % Creating random matrix (negative included) 

                 % by r and c dimension

>> eye(d) % Creating a diagonal matrix

Vector In Matlab

In Matlab, data structure vector and matrix:

>> id = [4 5 6 2 4]

4 5 6 2 4 

>> id = 1:5    % start:end

1 2 3 4 5

>> id = 1:2:10    % start:step:end

1 3 5 7 9

How to access elements in matrix:

>> id = [4 5 6 7 8]

4 5 6 7 8

>> id(1)    % Get the 1st element of the id

4

>> id([1 2 3])    % Get the 1st, 2nd, 3rd elements of id

4 5 6 

>> id(1:3)    % Get the 1st till the 3rd elements

4 5 6

>> id(end) % Get the last element
8

Regex In Javascript

pattern in search. g modifiers treat to all elements matched. i modifiers treat incase-sensitive

anElement.innerHTML = "Indonesia".search(/do/i); // return 4

output> 4

elem.innerHTML = "indonesia".split(/[aiueo]/);

output> ,nd,n,s,, // 6 array elements

elem.innerHTML = /wo/.test("Hello world");    

output> true;

String method for Regex:

1. search(pattern) : index

2. split(pattern)  : array >< match

3. replace(pattern,textReplacer): string

4. match(pattern) : array >< split

var hello = "Hello world";

elem.innerHTML = hello.search(/world/ig);

output> 6

elem.innerHTML = hello.split(/[aiueo]/ig);

output> h,ll, w,rld

elem.innerHTML = hello.replace(/world/,"lady gaga");
output> hello lady gaga

elem.innerHTML = hello.match(/[aiueo]/);

output> e,o,o

String Operation In Javascript

Declare a string variable:

var desc = "Helping others who want to help themself";

To get the length of the string, use:
elem.innerHTML = desc.length;

output> 40

elem.innerHTML = desc.toUpperCase();

output> HELPING OTHERS WHO WANT TO HELP THEMSELF

elem.innerHTML = desc.toLowerCase();

output> helping others who want to help themself

elem.innerHTML = desc.charAt(0);    // char at first index.

output> H

elem.innerHTML = desc.charAt(desc.length-1)); // the last char

output> f

var zero = "indonesia";

var one = " sunday";

var two = " friday";

elem.innerHTML = zero.concat(one, two);    // new string

output> indonesia sunday friday

var hello = "Hello World";

elem.innerHTML = hello.indexOf("Wor");

output> 6

elem.innerHTML = hello.indexOf("WORLD");    // nothing

output> -1

elem.innerHTML = hello.indexOf("o");

output> 4

elem.innerHTML = hello.lastIndexOf("o");

output> 7

var hello = "Hello World";

elem.innerHTML = hello.slice(1);

output> ello World

elem.innerHTML = hello.slice(hello.indexOf("W"));

output> World

var abc = "ABCDE";

elem.innerHTML = hello.substr(2,2);

output> CD

Perl Subroutines

To create a subroutine in Perl, type:

sub hello

{

    print "Hello, World!\n";

}

To call it, type:

&hello;

or

$hello($_);

or

$hello(1+2,$_);

Expressions In JavaFX

Block expression is surrounded by curly bracket:

var total = {

    var value = [1..10];

    var sum = 0;

    for( v in value){

        sum = sum + v;

}

    sum;

}

If Else block:

var a = 4;

if(a>5){

println("4 is greater than 5");

}else{

println("4 is less than 5");

}

Range expression:

var seq = [1..100];

var seq2 = [1..100 step 2];
var seqDesc = [100..1 step -1];

For expression:

var data = [1..100 step 2];

for(d in data){

    println(d);

}

While expression:

var i = 0;

while(i<10){

    println(i);

    i++;

}

JavaFX Sequence

To create a sequence, type:

var names = ["lady gaga","steve jobs","bill gates"];

var ages = [24, 55, 58];

var value = [1..100];
var valued = value[n | n>50]; // greater than 50

To access an element from this sequence, use [ ] operator:
println(names[0]); // print out lady gaga

println(value[70]);

To know how much size of the sequence, use:
println(sizeof names);

Use insert command to insert an element into sequence:

insert "barack obama" into names;

insert "larry page" after names[0];

insert "sergey brin" before names[0];

Use delete command to delete an element from sequence:

delete names[0];                 // delete lady gaga

delete "barack obama" from names;

Reversing sequence elements order:
value = reverse value;

JavaFX Object Literal

To create an object literal, the procedures are:

1. create a class file named Data.fx

    public class Data{

        public var name: String;

        public var city: String;

        public var age: Integer;

        public function setName(name){

            this.name = name;

}

        public function getName(){

            return this.name;

}

}

2. Create a var to Object literal in main program

    var lady = Data{

        name: "Lady Gaga";

        city: "New York";

        age: 24;

}

3. Now you are ready to use it:

    println("Name: {lady.name}");

    println("City: {lady.city}");

    println("Age: {lady.age}");

    lady.setName("Stefani Joanne Angelina Germanotta");

    println(lady.getName()); 

Function In JavaFX

Function concept in JavaFX is so simple like in Javascript:

function hello(name:String){

    println("Hello, {name}!");

}

To call it, use:

hello("Lady Gaga");

Other samples:

function add(x:Integer,y:Integer){

    println("Add: {x} + {y} = {x+y}");

}

function add(x:Integer,y:Integer){

    return x+y;

}

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Friday, December 31, 2010

Monday, December 27, 2010

Saturday, December 25, 2010

Thursday, December 23, 2010

Wednesday, December 22, 2010