The true delight is in the finding out rather than in the knowing.
-- Isaac Asimov
-- Isaac Asimov
Using Google's Blogsearch
I’m using hobix to power my blog. Unfortunately it requires some work to get the dynamic components up and running (search and comments).
So I decided to use Google’s Blogsearch which is pretty powerful.
To include a search box on your own site paste the following code into your HTML template and set the
I use two pinging-services:
So I decided to use Google’s Blogsearch which is pretty powerful.
To include a search box on your own site paste the following code into your HTML template and set the
bl_url field to your own domain:
<form method="get" action="http://blogsearch.google.com/blogsearch">
<input name="as_q" size="15" maxlength="255" value="" type="text">
<input name="sa" value="Google Search" type="submit">
<input name="bl_url" value="blog.interlinked.org" type="hidden">
<input name="ie" value="ISO-8859-15" type="hidden">
<input name="oe" value="ISO-8859-15" type="hidden">
</form>
- inblogtitle: search only within the title of the blog
- inposttitle: search only within the title of the posting
- inpostauthor: search only within the author field
- blogurl: return only results starting with the given URL (that’s exactly what we use for our search-box)
I use two pinging-services:
- http://pingomatic.com/
- http://pingoat.com/index.php
The tools we use have a profound (and devious!) influence on our thinking habits, and, therefore, on our thinking.
— Edsger Dijkstra
— Edsger Dijkstra
Comments
Everything ever published on this site
Copyright 2005- by Michael Jakl, Austria
My version control journey started with CVS, after that I looked at SVN, but never really used it. The shortcomings of centralized repositories were too obvious and with my increasing interest in Haskell I jumped on the distributed version control train with Darcs. I really, really liked it, but it had some nasty things too. After a while I was looking for something different and stumbled over Mercurial, again I was really happy with it but somehow my journey wasn’t over yet.
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Map of the course, watershed, and major tributaries of the Mississippi River
The Mississippi River System, also referred to as the Western Rivers, is a mostly riverine network which includes the Mississippi River and connecting waterways.
From the perspective of natural geography and hydrology, the system consists of the Mississippi River itself and its numerous natural tributaries and distributaries. The major tributaries are the Ohio, Illinois, Arkansas, Red and Missouri Rivers and, indirectly, such major Ohio River tributaries as the Allegheny, Tennessee, and Wabash rivers. [1]
From the perspective of modern commercial navigation, the system includes the above as well as navigable inland waterways which are connected by artificial means. Important connecting waterways include the Illinois Waterway, the Tennessee-Tombigbee Waterway, and the Gulf Intracoastal Waterway. This system of waterways is maintained by the U.S. Army Corps of Engineers with a project depth of between 9 and 12 feet (2.7 – 3.7 m) to accommodate barge transportation, primarily of bulk commodities. [2]
The Mississippi River carries 60% of U.S grain shipments, 22% of oil and gas shipments, and 20% of coal.[3]
Coordinates: 47°14′23″N 95°12′27″W / 47.23972°N 95.20750°W
Copyright 2005- by Michael Jakl, Austria
The true delight is in the finding out rather than in the knowing.
-- Isaac Asimov
-- Isaac Asimov
The Most Amazing PostgreSQL Database
For me PostgreSQL is the most amazing (open source) database around. Even though, there is much interest in stripped down NoSQL databases like key-value stores or “data structure servers”, PostgreSQL continues to innovate at the SQL frontier.
In this post, I’ll show a few of the newer, less known, features of PostgreSQL- far beyond standard SQL.
To enable the hstore extension, run
Let’s create a simple table with a hstore column:
Let’s create a new table to play around with this type:
Currently PLv8 isn’t included in the standard distribution of PostgreSQL (9.2), but installing it isn’t very hard, the only dependencies are postgresql and the v8 engine. Some distributions already have v8 in their repositories (Archlinux).
Compiling and installing the extension is straight forward as soon as the dependencies are in place:
For example, I’ve downloaded the ispell spelling dictionaries, and loaded them into a table
Since we’re working with text data, let’s introduce another extension
To take advantage of the nearest neighbor index, we have to build it:
In this post, I’ll show a few of the newer, less known, features of PostgreSQL- far beyond standard SQL.
hstore
hstore is a key-value store for simple data types. Using hstore, we’re able to create a key-value store within columns of a table.To enable the hstore extension, run
create extension hstore' in the PostgreSQL prompt. After that the hstore data type is available for our table definitions.Let’s create a simple table with a hstore column:
create table hstoretest ( id serial primary key, data hstore );
insert into hstoretest (data) values ('key1 => 123, key2 => "text"'::hstore);
select * from hstoretest;
id | data
----+-----------------------------------------------------------
1 | "key1"=>"123", "key2"=>"text"
key2 values:select data -> 'key2' as key2 from hstoretest;
key2
------
text
(1 row)
JSON
A JSON data type was introduced in release 9.2. Currently this is nothing more than a validating data type, thus it checks if the string we put into that column is a valid JSON object.Let’s create a new table to play around with this type:
create table jsontest ( id serial primary key, data json );
insert into jsontest (data) values ('{"title":wrong}');
ERROR: invalid input syntax for type json
LINE 1: insert into jsontest (data) values ('{"title":wrong}');
^
DETAIL: Token "wrong" is invalid.
CONTEXT: JSON data, line 1: {"title":wrong...
insert into jsontest (data) values ('{"title":"right"}');
select row_to_json(hstoretest) from hstoretest;
row_to_json
-----------------------------------------------------------------------------------------
{"id":1,"data":"\"key1\"=>\"123\", \"key2\"=>\"text\""}
(1 row)
PLv8
Working directly with JSON and JavaScript has been all the rage in many of the NoSQL databases. Using the PLv8 extension, we can use JavaScript (executed by Google’s awesome V8 engine) directly in PostgreSQL. Together with the JSON data type, this offers amazing new possibilities.Currently PLv8 isn’t included in the standard distribution of PostgreSQL (9.2), but installing it isn’t very hard, the only dependencies are postgresql and the v8 engine. Some distributions already have v8 in their repositories (Archlinux).
Compiling and installing the extension is straight forward as soon as the dependencies are in place:
make && sudo make install
create extension plv8;
create or replace function jmember (j json, key text )
RETURNS text
LANGUAGE plv8
IMMUTABLE
AS $function$
var ej = JSON.parse(j);
if (typeof ej != 'object')
return NULL;
return JSON.stringify(ej[key]);
$function$;
jmember function allows us to parse and read the JSON string and returns the member identified by key:select jmember(data, 'title') from jsontest;
jmember
-----------------
"right"
(1 row)
k-Nearest Neighbors
In PostgreSQL 9.1, a nearest neighbor indexing was introduced. This allows us to perform orderings etc. by a distance metric.For example, I’ve downloaded the ispell spelling dictionaries, and loaded them into a table
words like this:create table words (word varchar(50) primary key);
copy words from 'english.0';
Since we’re working with text data, let’s introduce another extension
pg_trgm, which builds tri-grams of strings (triples of three characters). Using theses tri-grams, we can compute a distance metric. Enable the extension like this:create extension pg_trgm;
hello would look like this:select show_trgm('hello');
show_trgm
---------------------------------
{" h"," he",ell,hel,llo,"lo "}
(1 row)
To take advantage of the nearest neighbor index, we have to build it:
create index word_trgm_idx on words using gist (word gist_trgm_ops);
select word, word <-> 'hello' as distance from words order by word <-> 'hello' asc limit 10;
word | distance
--------+----------
hello | 0
hellos | 0.375
hell | 0.428571
hells | 0.5
heller | 0.555556
hell's | 0.555556
help | 0.625
helm | 0.625
held | 0.625
helps | 0.666667
(10 rows)
<-> operator comes from the pg_trgm extension, of course we could use simpler distances like numerical difference or geometric distance, but working with textual data is often perceived as particularly difficult (not so with PostgreSQL).
Now Postgres is more or less the first choice of people with experience running production databases. It’s more powerful, more reliable, and has a better set of features than any other open source data storage layer out there today.
— Peter van Hardenberg, Tech Lead, Heroku Postgres
— Peter van Hardenberg, Tech Lead, Heroku Postgres
Git Overview
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Mercurial Version Control Status in the ZSH Command Line Prompt
Show the status of the current project on the prompt.
I sometimes forget to push or pull changes to or from a remote repository. To remedy the problem I wrote myself a little script to show me the status on the prompt.
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Continue to full post...
Emacs Basics
A very basic Emacs introduction.
It’s been a while since I wrote my Vim Introduction and Tutorial (exactly one year). A lot happened between now and then, I chose to get a better feeling about Emacs for example.
The reasons aren’t easily explained; The most prominent reason is the awesome AucTex-mode since I’m working heavily with LaTeX lately.
Anyways, learning Vim and Emacs is better than learning only one of them :-).
Continue to full post...
The reasons aren’t easily explained; The most prominent reason is the awesome AucTex-mode since I’m working heavily with LaTeX lately.
Anyways, learning Vim and Emacs is better than learning only one of them :-).
Continue to full post...
Addendum to "Time Machine for every Unix out there"
My article about using rsync to mimic the behavior of Apple’s Time Machine generated a lot of traffic, and more important, a lot of feedback.
In this article I’ll summarize and try to clarify a few things.
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In this article I’ll summarize and try to clarify a few things.
Continue to full post...
Time Machine for every Unix out there
Using rsync to mimic the behavior of Apple's Time Machine feature
rsync is one of the tools that have gradually infiltrated my day to day tool-box (aside Vim and Zsh).
Using rsync it’s very easy to mimic Mac OS X new feature called Time Machine. In this article I’ll show how to do it, but there is still a nice GUI missing – for those who like it shiny.
Continue to full post...
Using rsync it’s very easy to mimic Mac OS X new feature called Time Machine. In this article I’ll show how to do it, but there is still a nice GUI missing – for those who like it shiny.
Continue to full post...
Linux peripheral devices configuration
Configuring "advanced" peripherals (Microsoft Ergonomic Keyboard 4000, Logitech MX1000) and performance tuning by installing the right display driver.
This weekend I tried to get my new keyboard (Microsoft Ergonomic Keyboard 4000) and my Logitech MX1000 Laser mouse to work properly. The Keyboard has many extra-keys I didn’t bother to count, and the mouse has 12 buttons which can be very useful at times.
Almost accidently I solved a bugging performance problem with the Firefox browser. It was incredibly slow when opening Google Spreadsheets, well the whole system was incredibly slow while loading the spreadsheet… .
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Almost accidently I solved a bugging performance problem with the Firefox browser. It was incredibly slow when opening Google Spreadsheets, well the whole system was incredibly slow while loading the spreadsheet… .
Continue to full post...
Vim Introduction and Tutorial
I often tried to learn the great Emacs editor/IDE/operating system. The last time I tried it, I spent some time getting comfortable with it until I wanted to customize my
That was the point when I entered
Continue to full post...
.emacs file.That was the point when I entered
vi .emacs. As soon as I realized what I’ve done, I knew that Vim has won me over a long time ago.Continue to full post...
Haskell - Laziness
Haskell is a non-strict, or lazy, language. This means it evaluates expressions only when it needs their results.
Laziness is one of the things that make Haskell special – really special. Lazy evaluation allows easy handling of infinite data-structures.
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Laziness is one of the things that make Haskell special – really special. Lazy evaluation allows easy handling of infinite data-structures.
Continue to full post...
Haskell Basics
The article I wrote yesterday was just the beginning, today we’ll look at the next step in becoming Haskell experts.
Yesterday we’ve learned how to split up our program and how to compile, or run it. Today we’ll look at some basic features of Haskell.
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Yesterday we’ve learned how to split up our program and how to compile, or run it. Today we’ll look at some basic features of Haskell.
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Haskell
Danger! If you are happy with your current knowledge of programming languages, don’t read on – Haskell might be responsible for some serious defects in your motivation.
I was always some kind of programming language geek. I loved learning and playing around with all kinds of programming languages1. Currently I’m trying to learn Haskell. Even though I learned functional programming at my university (two semesters using Haskell), I didn’t really learn how to interact with the outside world. This is where things start to get messy, no matter how beautiful the language is.
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I was always some kind of programming language geek. I loved learning and playing around with all kinds of programming languages1. Currently I’m trying to learn Haskell. Even though I learned functional programming at my university (two semesters using Haskell), I didn’t really learn how to interact with the outside world. This is where things start to get messy, no matter how beautiful the language is.
Continue to full post...
Using Google's Blogsearch
I’m using hobix to power my blog. Unfortunately it requires some work to get the dynamic components up and running (search and comments).
So I decided to use Google’s Blogsearch which is pretty powerful.
Continue to full post...
So I decided to use Google’s Blogsearch which is pretty powerful.
Continue to full post...
Darcs
Taking version control to the next level.
Common version control tasks, and how they’re done using Darcs, a fresh approach to version control.
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Continue to full post...
Installing SQLite, Lighttpd, FastCGI and Ruby bindings on Mac OS X
I’ve had a hard time installing SQLite, Lighttpd, FastCGI together with Ruby bindings on OS X, so I thought I could share my experiences.
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- Mississippi
- Mississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city with 175,437 people in 2012 up 1.1% from the 2010 U.S. Census with 173,514. Wikipedia
- Capital: Jackson
- Governor: Phil Bryant
- Motto: Seal of Mississippi
- Rivers: Mississippi River, Tennessee River, Yazoo River,
- More
- Colleges and Universities: University of Mississippi,
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- Points of interest
US State
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Lackawanna, Jacksonville, FL - From your Internet address - Use precise location
Mississippi River System
From Wikipedia, the free encyclopedia
From the perspective of natural geography and hydrology, the system consists of the Mississippi River itself and its numerous natural tributaries and distributaries. The major tributaries are the Ohio, Illinois, Arkansas, Red and Missouri Rivers and, indirectly, such major Ohio River tributaries as the Allegheny, Tennessee, and Wabash rivers. [1]
From the perspective of modern commercial navigation, the system includes the above as well as navigable inland waterways which are connected by artificial means. Important connecting waterways include the Illinois Waterway, the Tennessee-Tombigbee Waterway, and the Gulf Intracoastal Waterway. This system of waterways is maintained by the U.S. Army Corps of Engineers with a project depth of between 9 and 12 feet (2.7 – 3.7 m) to accommodate barge transportation, primarily of bulk commodities. [2]
The Mississippi River carries 60% of U.S grain shipments, 22% of oil and gas shipments, and 20% of coal.[3]
Notes[edit]
- Jump up ^ "Mississippi River". USGS Biological Resources. Archived from the original on 2005-10-28. Retrieved 2006-03-08.
- Jump up ^ "The Mississippi River System". US Army Corps of Engineers. Retrieved 2006-03-08.
- Jump up ^ http://www.npr.org/2013/01/10/168950808/mississippi-blues-when-the-river-doesnt-run
 | This article about a specific United States location is a stub. You can help Wikipedia by expanding it. |
Coordinates: 47°14′23″N 95°12′27″W / 47.23972°N 95.20750°W
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