When searching for text snippets in sql databases you might want to rank the results according to “how good did it match”. And: the ranking shouldn’t make the query slower.
Let’s take a simple example using the LIKE operator. (I know, FTS does a better job, but let’s stick to like for now).
Assume the search …
by far not as powerful as the Fastest Fourier Transform in the West but maybe sometimes useful for a quick data analysis or de-noising. Reads stdin and writes to stdout.
Algorithm taken from Meyberg, Vachenauer: Höhere Mathematik II and ported to plain ruby myself.
< ![CDATA[
#!/usr/bin/env ruby
require ‘complex’
class Array
# DFT and inverse.
#
# Algorithm from
# …
Loading UIImages automatically in high-resolution works fine for locally stored images – but if you want to fetch them via remote URL you have to code yourself.
A simple, blocking but backward compatible (iOS >= 3.0, maybe even 2.0 but untested) implementation could look like this:
@implementation UIImage (MRORemote)
// add the @2x filename suffix
+(NSURL *)url2x:(NSURL …
The iPhone4 comes with a super high-res display and to leverage that encourages App Developers to provide all artwork twofold – once “normal” and once in double resolution named equally with a “@2x” suffix.
To ease my designers’ life and avoid confusion (and designers are easily confused I found) I ask them to provide the …
again, for my custom install location I need to prepare:
cleanly uninstall and remove cruft:
$ dir=/Users/Developer.SnowLeopard
$ sudo sh $dir/Library/uninstall-devtools
$ sudo rm -r $dir/*
$ sudo mv /Developer /Developer.deleteme
then do the custom-location install and
finally restore some hotfix softlinks:
$ dir=/Users/Developer.SnowLeopard
$ sudo ln -s $dir/Platforms /Developer/Platforms
$ sudo ln -s $dir/SDKs /Developer/SDKs
$ sudo ln -s $dir/Applications/Xcode.app /Developer/Applications/Xcode.app
Not removing the cruft …
UILabel’s font property accepts UIFonts – but strange enough there’s no way to get a custom loaded CGFont (from a ttf or otf file) converted into such an UIFont. You’re stuck with the iPhone’s pre-installed fonts – at least when you have to support iOS 3.0 devices.
After googling a bit and searching Stackoverflow I found …
After upgrading to iOS 4.0 SDK, iPhone OS 3.0 is no longer a valid “Base SDK”. Naively switching to iPhone 3.2 prevents deployment to a 3.0 device.
But such “Project -> Edit Project Settings” work out fine:
“Deployment Target” hint found here.
just downloaded and installed the iOS 4 SDK and as my root OS X partition is rather (too) small, I put it into a custom location /Users/Developer.Snowleopard/.
This causes the iPhone Simulator to crash and compiling gives an error like:
ibtool failed with exception: Interface Builder encountered an error communicating with the iPhone Simulator. If you …
when developing for long-term use, you want to use APIs that aren’t likely to be removed soon, a.k.a. “deprecated”.
So, don’t use downward compatible calls below a point you really aim for.
XCode helps with compiler warnings about “deprecated” calls – if “Project -> Edit Project Settings -> GCC_WARN_ABOUT_DEPRECATED_FUNCTIONS” is set:
But be careful, this complains e.g. …
after failing and failing again in the last months, I finally got it with the help of http://www.debian-administration.org/articles/137
The .htaccess configuration
AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css application/javascript
requires Apache’s mod_deflate enabled via
$ a2enmod deflate
Module deflate installed; run /etc/init.d/apache2 force-reload to enable.
Check the result with http://www.gidnetwork.com/tools/gzip-test.php
Caution: There seems to be an If-Modified-Since/Last-Modified HTTP 304 bug in mod_deflate, …