Simple module that makes gears with circular-shaped teeth. The gears maintain their shape even for extremely low teeth numbers up to 2. Parameters:
teeth: number of teeth.step: width of one teeth (diameter of the circle).Two gears produced with the same step will transfer movement, so one
typically fixes a step for all the gears and varies teeth for each gear,
which decides the radius and transfer ratio. Example:
| // Barebones program that reads a video file, extracts | |
| // the video stream, processes it someway and then encodes | |
| // it (alone) to another file. | |
| #include <stdio.h> | |
| #include <libavutil/opt.h> | |
| #include <libavformat/avformat.h> | |
| #include <libavcodec/avcodec.h> | |
| #include <libavfilter/avfilter.h> |
| /** | |
| * Program I hacked up to produce timelapses with dynamic speedup | |
| * factor. The `get_speed` function will be called periodically | |
| * to decide what speedup should be applied at that point of the | |
| * input video. | |
| * | |
| * This works by simply duplicating / dropping frames just as the | |
| * `fps` filter would (zero-order hold). The program is based on | |
| * the `transcoding.c` example, and is dirty. Make sure the input | |
| * contains no streams other than the video stream to process. |
| """ Implements the D'Hondt method. | |
| Given a chamber of `total_seats` seats, and a dictionary of | |
| integer values (vote counts), one for each party, assigns seats | |
| to each party using the D'Hondt method. | |
| Returns a dictionary of integer values (assigned seats). Results | |
| are undefined if two parties have the same number of non-zero | |
| votes, or there are no votes. | |
| Example (taken from Wikipedia): |
| Siglas Nombre Logo | |
| ALCD ALIANZA DE CENTRO DEMOCRÁTICO http://resultados2016.infoelecciones.es/99imgs/LOGOCO990001.gif | |
| AND PARTIDO SOMOS ANDALUCES POR ANDALUCÍA Y LOS PUEBLOS http://resultados2016.infoelecciones.es/99imgs/LOGOCO990002.gif | |
| BNG-NÓS BNG-NÓS CANDIDATURA GALEGA http://resultados2016.infoelecciones.es/99imgs/LOGOCO990005.gif | |
| C's CIUDADANOS-PARTIDO DE LA CIUDADANÍA http://resultados2016.infoelecciones.es/99imgs/LOGOCO990013.gif | |
| CCa-PNC COALICIÓN CANARIA-PARTIDO NACIONALISTA CANARIO http://resultados2016.infoelecciones.es/99imgs/LOGOCO990007.gif | |
| CCD CIUDADANOS DE CENTRO DEMOCRÁTICO http://resultados2016.infoelecciones.es/99imgs/LOGOCO990008.gif | |
| CCD-CI CIUDADANOS DE CENTRO DEMOCRÁTICO-CANDIDATURA INDEPENDIENTE http://resultados2016.infoelecciones.es/99imgs/LOGOCO990009.gif | |
| CDC CONVERGÈNCIA DEMOCRÀTICA DE CATALUNYA http://resultados2016.infoelecciones.es/99imgs/LOGOCO990010.gif | |
| CENTRO MODERADO LOS VERDES-ECOPACIFISTAS http://resultados2016.infoelecciones.es/99imgs/LOGOCO990011.gif |
QR codes come in 40 sizes, or versions. Each version is 4 pixels wider than the previous. Version 1 is 21 by 21 pixels wide, version 2 is 25 by 25, and so on.
This function allows one to calculate the number of pixels (or bits) used for the actual content and error correction. More precisely: the count of pixels that are not part of the finders, separators, timing patterns, alignment modules, format info, version info, dark module or quiet zone. The pattern mask is applied to these pixels only.
It accepts a parameter v which is the version number.
For example, a version 1 QR (the smallest possible) has 208 usable bits, so get_usable_bits(1) would return 208.
This program adds proxy support to ssh. Once installed, ssh will obey
the ssh_proxy environment variable (or all_proxy as a fallback) and
will try to connect to the server through that proxy. Example:
export ssh_proxy="socks5://10.139.2.1:8066"
ssh example.com # will connect through SOCKS5 proxy
| import math | |
| # Basic "convert to binomial, then back to polar" stuff, nothing interesting | |
| def radial_avg(angles): | |
| dx, dy = (0, 0) | |
| for angle in angles: | |
| dx += math.cos(angle) | |
| dy += math.sin(angle) | |
| return math.atan2(dy, dx) |
| # Program that tries to fill transparent gaps in an image from adjacent pixels. | |
| # To use, take the image and remove the alpha channel. Write this alpha channel | |
| # to a separate grayscale image. Feed both images to this script. You may want | |
| # to tweak the constants below: | |
| SIZES = [1,2,3,4,5,6,8,10,14,18,24,30] | |
| BASE_BLUR = 1 | |
| GAUSSIAN_MULTIPLY = 1.2 | |
| import cv2 | |
| import numpy as np |
Quick boilerplate for when you need a LaTeX inline thing converted to an image.
Enter the expression in fig.tex, and run:
pdflatex fig.tex < /dev/null && convert -density 600 fig.pdf -flatten -scale 50% -quality 90 fig.jpg
Things you may want to change:
varwidth=40em to the document options, or use \minipage for a fixed width.-density, -quality and border accordingly, or produce a .png.