programming « WordPress.com Tag Feed

Weekend updates to the Emacs ports

keramida — Mon, 08 Sep 2008 03:09:01 +0000

This weekend the GNU Emacs team released version 22.3.

An update to the "editors/emacs" FreeBSD port is pending review and should be committed to the FreeBSD ports tree soon. If you are interested in pretesting of the port patch, you can grab the update patch for the port from:

http://hg.hellug.gr/keramida/ports/emacs/rev/500c90d6dcb9

There is also an update of "editors/emacs-devel" in the works. The pretesting patch for this update is also available online at:

http://hg.hellug.gr/keramida/ports/emacs-devel/rev/3f8f27a6a19a

These patches do not include updates to "ports/UPDATING" or "ports/Mk/bsd.emacs.mk" so if you are going to test them, please drop me a note, or patch your "bsd.emacs.mk" file with:

--- bsd.emacs.mk.orig	2008-09-08 05:55:12.000000000 +0300
+++ bsd.emacs.mk	2008-09-08 05:55:39.000000000 +0300
@@ -83,7 +83,7 @@
 # Emacs-22.x
 .elif (${EMACS_PORT_NAME} == "emacs22")
 EMACS_NAME=		emacs
-EMACS_VER=		22.2
+EMACS_VER=		22.3
 EMACS_MAJOR_VER=	22
 EMACS_LIBDIR?=		share/${EMACS_NAME}
 EMACS_LIBDIR_WITH_VER?=	share/${EMACS_NAME}/${EMACS_VER}

I'll update the post when the patches have been committed to the CVS tree of FreeBSD Ports, so you can pull the updates from CVS or portsnap and reinstall.

Eee PC 701 with a real linux distro that's hardware native!

schiralli — Mon, 08 Sep 2008 03:05:04 +0000

Further to my earler post "The coolest laptop ever" - more news has come to light in relation to the option of installing a fully fledged distro on the laptop.

Mandriva One is now a fully hardware native linux distro.. meaning that after installing all the hardware on the Eee PC is detected "out of the box" including wifi!!!!

[caption id="" align="aligncenter" width="500" caption="Mandriva One on Eee PC!!!"][/caption] [caption id="" align="aligncenter" width="500" caption="Specs shown (uses the full 900mhz rather than just 600 odd)"][/caption]

So once you get the file from here -->

http://www.mandriva.com/en/download

Then lets run through the steps to getting your system running smoothly.

Creating the install media for the Hard Disk Install

The Hard Disk install method requires an 8GB or larger USB key, SDHC card or USB hard disk; an extra small USB key will make things a lot simpler. The basic idea is to get the installer on the small USB key as described in the preceding section, and download the iso image for the Mandriva Free DVD to the large USB key, SDHC card or USB hard disk. Other iso image files (in particular those for the KDE One or Gnome One CDs) are not supported so don't ask!

Then boot from the small USB key and when asked, choose the hard disk install method; next point the installer to the Mandriva Free DVD iso file on the install media and you are set.

In other words:

Download the Mandriva Free DVD iso file to your 8GB or larger USB key, SDHC card or USB hard disk (the install media); note that this file is larger than 4GB and cannot be downloaded to a FAT partition. Reformat/repartition your install media accordingly.
As described in the preceding section, download and write the all.img to a small USB key, and boot from it. The install media must also be accessible at this point.
When asked, choose the hard disk install method; next point the installer to the Mandriva Free DVD iso file (full path).

Creating the install media for the CD/DVD Install

The CD/DVD install method requires an external USB CD or DVD drive. May not work with LG external DVD drives.

If you have a CD drive, download the 3 CD iso files for the Free Mandriva edition, burn them and boot from the first CD.
If you have a DVD drive, download the DVD iso file for the Free Mandriva edition, burn it and boot from it.

The Mandriva 2008.1 installer

Right, so you have prepared the install media following the instructions above, and by pressing the <ESC> key after turning on your eeePC, you have booted from it. The Linux kernel on the install media will load and after a few seconds you should be presented with the Mandriva 2008.1 Installer on the eeePC screen.

From this point on you are running the traditional, user-friendly, multi-language Mandriva Installer. Follow the normal installation steps, there is nothing eeePC-specific. Take your time to read carefully through all the options.

Screenshots will be added in time, but for now be advised of a few things to change from the default installer options:

Choose the Standard security setting (do not use the default High as it is really not required on an eeePC).
Choose Custom partitioning. If you are installing on the SSD, delete all the existing partitions before you try to create a new one; yes, you do have to understand what a partition is and how partitioning works. Create a single / partition on the Mandriva media. Choose “Journaling reiserfs” as the partition type. In the partition options set the 'noatime' option. This is important to avoid excessive wear on Flash media.
Choose to manually select the packages to install, and when given the choice, choose whatever Desktop Environment(s) you want to have installed by default (Gnome, KDE, Xfce, etc). At login time you'll be able to open a menu and choose the session type.
Do not install any server software. Running Apache, MySQL and PHP on your eeePC is not recommended (although it can be done). ;)
Do not, unless you know exactly what you are doing, trim down the number of packages to install; this will likely result in an incomplete setup - guaranteed headaches later. You can add packages, but keep at least 500MB free on your Mandriva media (the installer tells you how much space is used and how much you have total)
Check and double-check (and triple-check, please) that you are installing Grub (the bootloader) to the correct device MBR. This is the most common mistake for first-time Mandriva users, and results in a Mandriva install that cannot be booted. :(
Do not try to manually configure network, video, sound or any other option after downloading the packages, these get automatically configured by the installer.
Wireless must be configured after the first reboot, see below.

READ this note if you are using the Hard disk Install method

There seems to be a bug in the Mandriva Installer that misidentifies the install media (the one that holds the Mandriva Free DVD iso image file). So when you are offered a choice between the various drives identified by the kernel, the correct one is not the one that has the right name! For example:

You wrote the DVD iso image file to your BrandX 8GB USB key. It shows up as drive sdc. When asked by the installer: “Select the disk containing the copy of the Mandriva Linux distribution install source”, if you answer sdc, the installer will not find the iso and will just loop asking the same question, or will give you a message saying “no partition found”. Try sdb, or sda, or sdd instead.

Post-Install Steps

OK, you have installed Mandriva 2008.1 and rebooted your eeePC successfully into Mandriva 2008.1 The following are some post-install steps required to get a smooth Mandriva 2008.1 eeePC “eXPerience”. Ha! :)

Configuring your software sources

Go to the Mandriva Control Center>Software>Software sources and follow the prompt to set up a full set (Free and Non-Free) of online sources. If you installed using the Hard Disk Install or CD/DVD Install methods, you'll want to remove the original install media from the list of available sources.

Now using your software install GUI in MandrivaControlCentre>Software>SoftwareInstall/Remove, you can install packages from any of the defined sources. Some packages will appear twice. Once from a Mandriva repository, and once from a PLF repository. Choose the PLF version if you want the extended features.

Configuring your wireless connection

Check that the blue LED (WiFi) is on.

Go to the Mandriva Control Center>Network>Add Network Interface GUI and follow the prompt to set up the wireless connection (obviously you will still need to be Ethernet connected to the internet at that point). Choose the madwifi driver (the ndiswrapper option would force you to install the XP wireless drivers) and when prompted, enter the appropriate parameters for your WiFi connection.

Minimize disk writes to prevent flash memory wear

To do this edit /etc/fstab and add the following lines at the end:

tmpfs /tmp tmpfs noatime 0 0
tmpfs /var/log tmpfs noatime 0 0
tmpfs /var/tmp tmpfs noatime 0 0

Note that any files written to these directories will be erased on reboot (but are kept during suspend/resume). Also check that your fstab file has your SSD or SDHC partitions mounted with the 'noatime' option. For example:

# Entry for /dev/sdc5 :
UUID=0c0701d1-5dc3-4c9e-982d-53ee393f1fb8 / ext3 noatime 1 1

If you are using a reiserfs partition, the options are slightly different:

# Entry for /dev/sdc5 :
UUID=0c0701d1-5dc3-4c9e-982d-53ee393f1fb8 / reiserfs noatime,nodiratime,notail 1 1

Disable unneeded services

(Check the FAQ here)

Configure Power Management

You want to get the best possible performance while maximizing battery time.

Disable unneeded devices (in the BIOS or using hotkeys).
(Check the FAQ here)

Installing RealPlayer

RealPlayer 10 installed out of the box will segfault but there is an easy fix to get that to work. edit /usr/bin/replay and add the following lines

export GTK_MODULES=
export GTK_IM_MODULES=

Those to lines also need to be added to hxplay

To get RealPlayer 11 to work add the following lines

export GTK_MODULES=
export GTK_IM_MODULE=xim LANGUAGE=en_US.UTF-8
export LANGUAGE=en_US.UTF-8

Also go to Tools, Preferences…, Hardware and change the hardware from ALSA to OSS

Creating ShortCut to Desktop

ridwan — Mon, 08 Sep 2008 02:01:05 +0000

List Program berikut adalah code untuk mengkopi folder aplikasi dan isinya serta membuatkan shortcut executable pada desktop. :) usesnya apa rada lupa.. Yang penting di coba dulu dech.. :D

[sourcecode language="delphi"]

uses ShlObj, ShellApi..

procedure CreateShortCut(Source : String);
var
   IObject : IUnknown;
   ISLink : IShellLink;
   IPFile : IPersistFile;
   PIDL : PItemIDList;
   InFolder : array[0..MAX_PATH] of Char;
   TargetName : String;
   LinkName : WideString;
begin
   TargetName := Source;

   IObject := CreateComObject(CLSID_ShellLink) ;
   ISLink := IObject as IShellLink;
   IPFile := IObject as IPersistFile;

   with ISLink do
   begin
     SetPath(pChar(TargetName)) ;
     SetWorkingDirectory(pChar(ExtractFilePath(TargetName))) ;
   end;

SHGetSpecialFolderLocation(0, CSIDL_DESKTOPDIRECTORY, PIDL) ;
SHGetPathFromIDList(PIDL, InFolder) ;

LinkName := InFolder + '\App ShortCut.lnk';
IPFile.Save(PWChar(LinkName), false) ;
end;

[/sourcecode]

[sourcecode language="delphi"]

procedure TFTool.cxButton1Click(Sender: TObject);
var
Fo      : TSHFileOpStruct;
buffer : array[0..4096] of char;
p       : pchar;
begin
MessageDlg('It will copy to PC which is Directory choose and create Shortcut ' +
    'in Desktop.',mtInformation,[mbOk],0);
FillChar(Buffer, sizeof(Buffer), #0);
p := @buffer;
StrECopy(p, 'E:\PROJECTS\APP\*.*'); //Diambil contoh aplikasi berada di E:\PROJECTS\APP
FillChar(Fo, sizeof(Fo), #0);

Fo.Wnd := Handle;
Fo.wFunc := FO_COPY;
Fo.pFrom := @Buffer;
Fo.pTo :='c:\app' ; // di Kopikan ke C.

if ((SHFileOperation(Fo) <> 0) or (Fo.fAnyOperationsAborted <> false)) then
begin
MessageDlg('Copying was cancelled !',mtInformation,[mbok],0);
end else
begin
CreateShortCut('c:\app\app.exe');
end;
end;

[/sourcecode]

Maka akan muncul di desktop App Shortcut sebagai shortcut app.exe. Selamat mencoba :)

My First Numerical Method in Java

Jesse — Mon, 08 Sep 2008 01:10:27 +0000

Last time I promised I would have real code for the Trapezoid Rule. It's relatively easy to change my pseudo code into C++, but I wish to do it in Java mainly because my university is forcing me to learn Java and I could use the practice. Though I'm not too thrilled about having to learn Java, I see this as an opportunity to practice my personal philosophy of being able to translate into different contexts in order to demonstrate understanding.

Last post my pseudo code looked ike this:

float trapezoidRule( n, a, b, f(x))

{
   h = (b-a) / n; //figure out interval length

   sum = (f(a) + f(b))/2; //sum initialized

   //do the sum and collect the terms
   for (i = 1; i <= n-1; i++)
        sum += f(a + i * h);
   sum *= h; 

   return sum;
}

It's almost usable as is, but it needs one more thing: it needs to have a way to evaluate the function that is being passed. An easy way to do this is to use an abstract method, or what is called in C++ a virtual function. Here I will just create an abstract class and extend it to the actual function that will be used.

//Function.java

public class abstract Function ()
{
   public double abstract getValue(double x);
}

Now when I inherit this class, I need to provide the actual implementation for getValue. Of course, this will depend on what function I want to integrate. For testing my program, I want to use a function I can integrate by hand to test for correctness. I will use $latex f(x) = x\log (x)$ for this purpose. So now I create my concrete function:

//logFunction.java

public class logFunction extends Function
{
	   public double getValue(double x)
	   {
	      return x*Math.log(x);
	   }
}

Now I can write the actual method for the Trapezoid Rule. The class will look almost identical to the pseudo code:

//trapezoidRule.java

public class trapezoidRule
{
    public static double integrate(double a,
                  double b, int n, Function f)
    {
    	double h = (b - a) / n;

    	double sum = (f.getValue(a)+ f.getValue(b))/2;

    	for(int i = 1; i <= (n-1); i++)
    	   sum += f.getValue(a + i * h);

    	sum *= h;

    	return sum;

  }
}

Finally, I need a driver program to test the numerical method. Something that prints the result to the screen will do:

//test.java

public class test
{
  public static void main(String args[])
  {
    double value;

    //  Integrate the function y = x*ln(x) from
    //  x=2 to x=4 with 20 iterations

    logFunction f = new logFunction();
    value = trapezoidRule.integrate(2.0, 4.0, 20,f);

    System.out.println("value = " + value);

  }
}

When I run the program, I get "value = 6.704638124459645". Now I will compare this to the real value:

$latex \displaystyle \int_{2}^{4}x\log x \,dx = \left . \frac{1}{2}x^{2} \log x- \frac{1} {4} x^{2} \right |_{2}^{4} \approx 6.704060528.$

Looks like I got an accurate answer to three decimal places. This sort of accuracy is way more than sufficient for games. What needs to be done now is to optimize the algorithm or maybe use a different one for fastest performance and maybe add some bells and whistles like templates, 2D plots, GUI interfaces, etc... Unfortunately, I'm a complete beginner so I would have to study a lot more to learn how to do those things. But the whole point of implementing this numerical method was to demonstrate that it is sometimes possible to start with only theoretical knowledge and to somehow use it to create real code that can be used in an application.

GMandel meets Julia sets

Fernando J. Pereda — Mon, 08 Sep 2008 01:08:54 +0000

I was bored and decided to hack support for viewing Julia sets into GMandel. The code could be nicer, but that will come tomorrow. I should really stop slacking and make a proper hierarchy of widgets (GFractMandel and GFractJulia should inherit a common GFractWidget) to make the code more manageable but this will do for now.

These are some examples of Julia sets generated with GMandel:

I strongly recommend The Computational Beauty of Nature to those interested or curious about this kind of stuff. It is a nice book that can even be read without too much mathematical or computer science background. One of the nice things about fractals and chaos is that you can see most the stuff yourself through pretty pictures.

— ferdy

Tentang MySQL

sultanofswings — Sun, 07 Sep 2008 20:41:27 +0000

Mysql....
So Curl

Media Player Update

pulsemedia — Sun, 07 Sep 2008 19:00:38 +0000

[caption id="attachment_13" align="aligncenter" width="371" caption="Pulse Media Skin"][/caption]

These are ScreenShots of a new Mp3 player called "Pulse Media"

[caption id="attachment_10" align="aligncenter" width="291" caption="Pulse Media"][/caption]

A Byte of Python

punchagan — Sun, 07 Sep 2008 17:08:09 +0000

This post's been inspired by a wonderful book, "A Byte of Python"^[1] by Swaroop C H. The book has been revised after a gap of nearly 4 years and the wait is worth it! I thoroughly loved the book, and I'm happy to be accompanied by so many others^[2]^[3]. This book has filled me with a sense of joy and pride. The pride, of being part of such a wonderful community, a beautiful crowd. Further, it is a matter of pride, the book's been authored by an Indian - its quite rare to find such books written by people in this part of the world.

I have loved python, the moment I started using it. There are quite a few occasions, where I did something, just because I had the power of Python with me. Python is undoubtedly amongst the best, not just as a first programming language, but to give the user a sense of "do-able-ity" and I am thoroughly enjoying it.

>>> import this The Zen of Python, by Tim Peters Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren't special enough to break the rules. Although practicality beats purity. Errors should never pass silently. Unless explicitly silenced. In the face of ambiguity, refuse the temptation to guess. There should be one-- and preferably only one --obvious way to do it. Although that way may not be obvious at first unless you're Dutch. Now is better than never. Although never is often better than *right* now. If the implementation is hard to explain, it's a bad idea. If the implementation is easy to explain, it may be a good idea. Namespaces are one honking great idea -- let's do more of those! >>>

Links, References:
[1] A Byte of Python
[2] Python - Notes -- Swaroop CH
[3] Book updated for Python 3000 -- Swaroop CH

این همه Notepad! تا حالا کجا بودن!؟

ایمان — Sun, 07 Sep 2008 15:28:20 +0000

یکی از نرم افزارهای حیاتی که هر فردی به آن نیاز دارد، یک "ویرایشگر متن" (= Text Editor) است. همان طور که می دانید در این زمینه انتخاب های زیادی وجود دارد که هرکس بر اساس سلیقه و نیاز خود یک ویرایشگر متن مناسب را انتخاب می کند. سیستم عامل ویندوز به صورت پیش فرض یک ویرایشگر متن ساده به نام Notepad دارد که خیلی ها از آن استفاده می کنند. Notepad از زمان پیدایش ویندوز همراه آن عرضه شده و در این سال ها کمتر دستخوش تغییر شده و هیچ قابلیت جدیدی به آن اضافه نشده است. کمبود امکانات این برنامه شرکت ها و برنامه نویسان را مجبور کرد تا محصولات مشابهی با قابلیت های گوناگون برای این نیاز اساسی کاربران تولید کنند.

توجه : در این مطلب قصد دارم تا لیستی از برنامه های جایگزین برای Notepad ویندوز تهیه کنم. توجه داشته باشید که فقط نرم افزارهای رایگان و آزاد در این صفحه معرفی خواهند شد. این مطلب به مرور و به کمک شما به روز خواهد شد.

ویرایشگرهای متن معمولی

این دسته شامل برنامه هایی است که ویژگی های معمول یک ویرایشگر متن را دارند و مناسب کاربران معمولی هستند.

Notepad2 : بهترین و شایسته ترین جایگزین برای Notepad ویندوز همین نرم افزار Notepad2 است. توصیه من به شما هم همین برنامه است. حجم پایین، دارای توابع مختلف برای کار با متون ساده، باز کردن فایل های حجیم با سرعت بالا، تنظیمات متنوع و قابلیت روشنایی نحوی (که البته این ویژگی برای طراحان وب و برنامه نویسان مناسب است)، از جمله مزایای این ویرایشگر متن قدرتمند است. کاربران معمولی، طراحان وب و برنامه نویسان افرادی هستند که این ویرایشگر متن نیاز آن ها را برطرف خواهد کرد.

programming « WordPress.com Tag Feed

Weekend updates to the Emacs ports

Eee PC 701 with a real linux distro that's hardware native!

Creating ShortCut to Desktop

My First Numerical Method in Java

GMandel meets Julia sets

Tentang MySQL

Media Player Update

A Byte of Python

این همه Notepad! تا حالا کجا بودن!؟

ویرایشگرهای متن معمولی

ویرایشگرهای متن با قابلیت رمزگذاری اطلاعات

ویرایشگر های متن با قابلیت مدیریت اطلاعات

ویرایشگرهای متن مخصوص طراحان وب و برنامه نویسان

ویرایشگرهای متن برای افرادی که متفاوت می اندیشند!

Functions and bound/unbound methods

Canary progress update

Headfirst HTML

on demand javascript

gemを1.2.0にアップデート

TextMateにGit Textmate bundleをインストール

Git Textmate bundleをgitでインストール

TextMateのbundleをリロード

gitのコミットメッセージ用のエディターをTextMateに設定

TextMateにTM_GIT変数を設定

Mac OS Xにgitをインストール

MacPortsにgitがあるか検索

git-coreをインストール

cogitoをインストール