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Statistics: combinations in Python
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return int( reduce(mul, (Fraction(n-i, i+1) for i in range(k)), 1) )
Test - printing Pascal's triangle:
>>> for n in range(17):
... print ' '.join('%5d'%nCk(n,k) for k in range(n+1)).center(100)
...
1 ...
What’s the best way to reload / refresh an iframe?
...mentById('iframeid').src
It will reload the iframe, even across domains!
Tested with IE7/8, Firefox and Chrome.
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Run a Docker image as a container
...you didn't specify tag_name it will automatically run an image with the 'latest' tag.
Instead of image_name, you can also specify an image ID (no tag_name).
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How to convert a PNG image to a SVG? [closed]
...nm # PNG to PNM
potrace file.pnm -s -o file.svg # PNM to SVG
Explain options
potrace -s => Output file is SVG
potrace -o file.svg => Write output to file.svg
Example
Input file = 2017.png
convert 2017.png 2017.pnm
Temporary file = 2017.pnm
potrace 2017.pnm -s -o 2017.svg
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How to capitalize the first letter in a String in Ruby
...want it to, it outputs мария instead of Мария.
If you're using Rails there's an easy workaround:
"мария".mb_chars.capitalize.to_s # requires ActiveSupport::Multibyte
Otherwise, you'll have to install the unicode gem and use it like this:
require 'unicode'
Unicode::capitalize("м...
How can I concatenate two arrays in Java?
...files where some of the facilities like those mentioned by Antti are not available.
– kvn
Feb 7 '11 at 15:46
4
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Base64Util 拓展：支持图像框、画布、文件、文本字符串、图像精灵base64编...
...件Base64 为 调用 Base64Util.文件转Base64 "/sdcard/AppInventor/data/test.png"
显示通知 "文件已编码为Base64格式"
设置组件背景
当 设置背景按钮.被点击
调用 Base64Util.Base64转背景图 背景图片数据 按钮1
注意事项...
HTML5 Email Validation
...d is either empty or valid. This also has some other interesting flags:
Tested in Chrome.
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jQuery get values of checked checkboxes into array
...el = $(this),
name = $el.attr("name");
if (/radio|checkbox/i.test($el.attr('type')) && !$el.prop('checked'))return;
if(name.indexOf('[') > -1)
{
var name_ar = name.split(']').join('').split('['),
name = name_ar[0],
index = name_a...
App Inventor 2 构建纯血鸿蒙 HarmonyOS App · App Inventor 2 中文网
... 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 搜索 ...