Entries tagged as softwareRelated tags android austria fail german gnu-linux google hardware phone public transport review samsung finance fun internet language machine learning bash bug image processing mathematics nautilus programming usenet video cloud storage crypto rant sustainability debian bluetooth google earth kernel migration postfix anti-spam career gentoo gnucash perl comic cw geographyMonday, January 23. 2012Overview of Dropbox alternatives![]() Since I plan to back up my worthy RAW pictures into the cloud (Why?), I collected some reference values of various cloud storage providers with the following important conditions in mind:
The following graph lists the various providers I found and plots their available volume packages against their prices: In the following I provide a short summary for each provider, and a conclusion of my personal considerations. Continue reading "Overview of Dropbox alternatives" Monday, September 19. 2011OMG, OMG, OMG: SCOTTY mobil für Android!!!11![]() SCOTTY mobil, den mobilen Reiseplaner der ÖBB, gibt’s jetzt auch offiziell für Android! Endlich! Nach dem, dem, dem und dem wurde das auch Zeit! Und die App funktioniert sogar sehr gut, hat ein interessantes Zeitauswahl-UI und macht Echtzeitdaten abrufbar. Friday, February 25. 2011Syncing with rsync to FAT devices![]() (I started this as a draft two years ago, but wasn’t sure about its correctness then.) Usually, one uses the -a switch when archiving files with rsync from Unix to Unix. -a is an abbreviation for -rlptgoD, which means
but this doesn’t make sense if the target is an MS FAT device (such as a USB key) or a CIFS/SMB/Samba host, as that old file system cr4p doesn’t know anything about symbolic links, file permissions, ownerships or other Unixy properties. Thus, rsync fails to match these features at all and synchronizes every single bit of every single file again. The solution I found is to simply use the tuple of time-stamp and file size as the only criteria whether something has changed. This still results in warnings about that the time-stamps of directories couldn’t be set, but at least the sync works. An example command line could thus be $ rsync -rt $source $target
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Monday, January 31. 2011VOR-/ÖBB-Fahrpläne mit Android abrufen, III![]() Nach einer ersten Auflistung einiger Möglichkeiten im April 2010 und einem Follow-Up im Juni mache ich hier nun weitere aktuelle Ergänzungen und erstelle einen Überblick, zumal immer wieder Leute zu dem Thema hier „aufschlagen“ (z.B. in den Kommentaren oder per einschlägiger Websuche). Die unten angeführte Liste ist nach meiner persönlichen Präferenz gereiht, gemäß folgender Anforderungen:
Hier nun meine Lösungen:
Zum Schluss sei noch auf eine Speziallösung hingewiesen: Offizielle RSS-Feeds über Betriebsstörungen. Ja, diese Feeds gibt es, und sie sind gut versteckt, aber via ÖBB-Streckeninformation zu finden. Sie würden sich gut z.B. in einem RSS-Widget machen. [Update 01.02.] Ein Twitter-User hat mich darauf aufmerksam gemacht, dass es offenbar im 2. Quartal eine Android-App von den ÖBB geben soll. Dies geht aus einem Kommentar auf der Facebook-Seite der ÖBB vom 5. Jänner hervor. Monday, November 1. 2010How I'd like to use Twitter![]() (The following is a kind of current-state analysis, maybe leading to my long intended anti-WWW rant. Honestly, I think Twitter is a broken technology. 140 characters are way too few to provide useful context. And as URLs eat from this character pool, the urge for link shorteners simply leaves this service behind broken, IMHO. Just look at this plot of the distribution of tweet lenghts: Well, some misuse Twitter as a chat, although IRC would be the technology of choice for that. I mainly use it as a news stream. In fact, Twitter changed their orientation from individual “Took a dump, ate a banana” status updates to personalized news. Although RSS or Atom are dedicated technology for collecting headlines and articles (and keeping their read/unread state), Twitter provides a unified time flow (that passes by, no matter if you read it or not). And while RSS/Atom is a kind of pull technology (i.e. you have to look at different feeds and articles for yourself), Twitter is a push variant where all elements meld into a single data stream. The problem is, in engineering terms, there’s so much noise in the data; there’s so much irrelevancy occurring in the timeline, at least in mine. I followed more and more people, like “Hey, this guy developped that app, and there’s a link to his Twitter”, or I chose to follow various companies when I noticed they had an account at Twitter. But more and more often I asked myself where a certain guy/gal I followed actually came from. I’m wasting too much time at Twitter. Meanwhile, I’m following more than 250 people. (Yeah, I think those who follow >300 are simply nuts. How the hell do they handle their timeline? How can they claim Twitter is not a distraction?) Me wants:
Of course, a lot of this already sounds like RSS. But there are tweets that are status updates per se and don’t contain URLs. It appears to me that Twitter and RSS (and maybe the whole social *BUZZWORD ALERT* media) are becoming “the HTTP of a new WWW”: It’s up to new and upcoming user interfaces to aggregate, weight, filter, sort and manage content coming from various data streams; new user interfaces for new devices, but also for the “old scholars”. I noticed recently that things are becoming better for me when using different Twitter—or rather, aggregator—clients, like TweetDeck or My6Sense. It’s becoming important for me to not just scream or hear screams, but to consume and provide relevant information. Monday, June 14. 2010VOR-/ÖBB-Fahrpläne mit Android abrufen, II![]() Zu meinem Initialposting zu diesem Thema gibt es nun ein Update: Die SCOTTY mobil-Version für (Non-Android) Motorola-Handys, scottymobil_mot.zip, lässt sich nun via NetMite.com konvertieren und auf Android-Smartphones via J2ME Runner (aus dem Market) betreiben. Ob auch die anderen Versionen laufen, war ich zu faul auszuprobieren; vermutlich funktioniert es nun einfach dank eines aktualisieren J2ME Runners. Die Applikation scheint jedenfalls vollständig zu funktionieren. Leider wird damit den ÖBB der Druck genommen, doch noch eine offizielle Version für Android zur Verfügung zu stellen. Sunday, May 2. 2010Averaging an image sequence with ImageMagick![]() Besides the fact that it was a pain to find out how ImageMagick’s -average option is to be used, it turned out to operate wrongly. The switch calculates the mean of an image sequence, i.e. the mean color values for every pixel. Say, if you have a bunch of images with file names like img*.jpg and want the average saved into avg.jpg, the command line is: $ convert img*jpg -average avg.jpg Pretty intuitive. The problem is that you define the mean image Ī[n] of n images I[k] as while ImageMagick does it recursively as
giving you wrong weights 1⁄2n−k+1 like e.g. for n=8 instead of the intended weights 1⁄n like
This misbehaviour can be proven e.g. by taking this sequence of a plain blue, green and red image: and averaging it with the above command. The result is too reddish:
The solution I found was to call convert recursively like this: #!/bin/bash i=0 for file in img*jpg; do echo -n "$file.. " if [ $i -eq 0 ]; then cp $file avg.jpg else convert $file avg.jpg -fx "(u+$i*v)/$[$i+1]" avg.jpg fi i=$[$i+1] done By this, the average of the above example images correctly becomes gray: There might be similar problems with the other image sequence operators, but I haven’t examined them. Maybe I should file a bug. Friday, April 16. 2010VOR-/ÖBB-Fahrpläne mit Android abrufen![]() Ich bin unlängst von einem Symbian-Handy auf ein Android umgestiegen und wollte die Applikation SCOTTY mobil von den ÖBB dort weiterbenutzen, um bequem aktuelle Zugverbindungen bzw. -verspätungen abrufen zu können, jedoch: Es gibt diese App nicht für Android, und auch nicht auf absehbare Zeit. Daher liste ich hier einmal die Möglichkeiten auf, die bleiben. Eins vorweg: Sie sind allesamt höchst unbefriedigend.
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