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How do I make a list of data frames?
... is done pretty easily when reading in files. Maybe you've got files data1.csv, data2.csv, ... in a directory. Your goal is a list of data.frames called mydata. The first thing you need is a vector with all the file names. You can construct this with paste (e.g., my_files = paste0("data", 1:5, ".csv...
Recursively add files by pattern
...standard | grep '\.java$' | xargs git add
– Michel Krämer
May 19 '10 at 10:52
add a comment
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How do I test for an empty JavaScript object?
...d May 19 '10 at 14:07
Erik Töyrä SilfverswärdErik Töyrä Silfverswärd
8,61722 gold badges2020 silver badges2121 bronze badges
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How can I output UTF-8 from Perl?
...e.g. for a poor man's case folder: perl -Mutf8 -CASDL -pe 'y/āáǎàēéěèīíǐìōóǒòūúǔùǖǘǚǜĀÁǍÀĒÉĚÈĪÍǏÌŌÓǑÒŪÚǓÙǕǗǙǛ/aaaaeeeeiiiioooouuuuüüüüAAAAEEEEIIIIOOOOUUUUÜÜÜÜ/'
– vladr
May 8 '18 at 21:32
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App Inventor 2在不同的屏幕之间传值 · App Inventor 2 中文网
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通过原生控制块“打开屏幕并传值”
列表传值
微数据库传值
« 返回首页
App Inventor 2 在不同的屏幕之间传值属于很常见的需求，这里提供各种不同的实现思路，供大家参考。
通过原生控制块“打开屏幕...
MIT已发布v2.75版本，中文网已同步升级最新版本 - App Inventor 2 中文网 -...
...习和使用，才能与大家分享。
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列表显示框组件有进一步的改进在上个版本（2022）中，列表显示框可以同时显示图片、主项及细项三部分内容，这个版本延续了这一功能，并在显示样式方面做了一些改进...
How do I get a consistent byte representation of strings in C# without manually specifying an encodi
...st string data = "A string with international characters: Norwegian: ÆØÅæøå, Chinese: 喂 谢谢";
var bytes = System.Text.Encoding.UTF8.GetBytes(data);
var decoded = System.Text.Encoding.UTF8.GetString(bytes);
Don't reinvent the wheel if you don't have to...
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How to write DataFrame to postgres table?
...s DB much faster than df.to_sql method and you won't need any intermediate csv file to store the df.
Create an engine based on your DB specifications.
Create a table in your postgres DB that has equal number of columns as the Dataframe (df).
Data in DF will get inserted in your postgres table.
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Loop through all the files with a specific extension
...} \; to avoid misparsing of the output of find
– umläute
Jan 21 '15 at 20:15
1
And if you don't...
What is the fastest way to create a checksum for large files in C#
...m).Replace("-", String.Empty).ToLower();
}
And I tested with a file of 29½ GB in size, the results were
10.000: 369,24s
100.000: 362,55s
1.000.000: 361,53s
10.000.000: 434,15s
100.000.000: 435,15s
1.000.000.000: 434,31s
And 376,22s when using the original, none buffered code.
I am running an ...