My first Dutch Ubuntu GNU/Linux wallpaper. Made within a couple of minutes using LibreOffice Impress.

Écrire « Janvier » dans la cellule B1 puis cliquer à coté. Cliquer de nouveau sur la cellule B1, amener le curseur au dessus du petit carré noir en bas à droite de la cellule. Quand le curseur se transforme en +, cliquer dessus et déplacer vers la droite en maintenant le clic appuyé, jusqu’à « Décembre », Dans la cellule A2, écrire le 1er jour de janvier (dimanche pour 2017) et, de la même manière que précédemment, le tirer sur cinq semaines vers le bas. Enfin, en vous référant au calendrier à droite de la barre des taches, placer les 1er jours de chaque mois dans la cellule correspondante et tirer vers le bas. Mettre de jolies couleurs, lettres et arrière-plan, et de jolies bordures, enlever les sauts de page (Menu Affichage / Saut de page), enregistrer sous (dans un dossier à votre nom dans le dossier Documents) puis Exporter en PDF.

Arnhem, The Netherlands.

Del jueves 24 al sábado 26 de abril, en el Edificio de Informática y Matemáticas (Campus de Tafira), tendrá lugar las II Jornadas Cracking the Coding Interview, organizadas por la Escuela de Ingeniería Informática de la Universidad de Las Palmas de Gran Canaria (ULPGC) y que pretenden preparar a los alumnos de Informática de los últimos cursos para que afronten con éxito una entrevista de trabajo, a través de charlas formativas y una simulación real con profesionales de empresas colaboradoras.

Más información: goo.gl/223BkK

Pantallazos

Del jueves 24 al sábado 26 de abril, en el Edificio de Informática y Matemáticas (Campus de Tafira), tendrá lugar las II Jornadas Cracking the Coding Interview, organizadas por la Escuela de Ingeniería Informática de la Universidad de Las Palmas de Gran Canaria (ULPGC) y que pretenden preparar a los alumnos de Informática de los últimos cursos para que afronten con éxito una entrevista de trabajo, a través de charlas formativas y una simulación real con profesionales de empresas colaboradoras.

Más información: goo.gl/223BkK

Find the graphing function to insert a scatter plot with markers only. Under Excel 2016, which we have on school computers, this is under insert on the ribbon menu. Refer to the video I made for help with LibreOffice or Google Sheets.

I tried to make this so it would loop seamlessly -- both the video and the soundtrack. Flickr's player doesn't let you turn on looping, so it's a bit of a pointless quest, but I was interested in seeing how close I could get.

The soundtrack* was (or should have been) relatively straightforward -- I found an audio track designed for seamless looping.

The video was obviously not going to be perfect, but I wanted to get as close as I could. Is there an established technique for this? I couldn't find one, so I wrote some shell scripts to break out all the video frames to separate files and run Imagemagick's compare operation to compute the Structural Similarity Index (SSIM) on pairs of images to find the best place to start and stop for (almost-)seamless looping. To do this for every start/stop pair requires an unwieldy N-factorial number of compares, where N is the number of frames; I wrote the scripts to take a starting frame range, a duration range, and a sample stride (spacing) to only check a subset of image pairs (e.g., only 1 out of every 10 frames). Output is a CSV file of scores that can be quickly visualized in a spreadsheet (I use LibreOffice Calc) with color-coding to find where matching is better or worse. With that info I visually inspected start/stop frames in the neighborhood to find the (subjectively) best pair and used ffmpeg to extract that clip and set it's frame-rate to give me a total duration that's an integer multiple of the soundtrack length.

The result isn't perfect. The video is obviously not going to match perfectly, though it's similar enough. But for some reason I don't understand, when I play it in a looping-capable player (e.g., VLC) there's a hiccup in both the video and audio at the loop-back point when it jumps from the end back to the start of the video. Shrug... I'll keep trying.

*Soundtrack is Summer Love Loop from MuzaProduction. This work is licensed under the Creative Commons Noncommercial 4.0 License.

2022-07-29_142346