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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
...下：
扫描蓝牙设备，代码如下：
扫描完成后，设备列表展示到“列表显示框”组件中：
点击列表中的目标设备（一般硬件文档会有说明，名称会有特别的标识），连接蓝牙设备的代码如下：
蓝牙App控制硬件
开始控制...
Compress files while reading data from STDIN
...ad data as input and redirect the compressed to output file i.e.
cat test.csv | gzip > test.csv.gz
cat test.csv will send the data as stdout and using pipe-sign gzip will read that data as stdin. Make sure to redirect the gzip output to some file as compressed data will not be written to the t...
How to find where a method is defined at runtime?
...#crime>
If you're on Ruby 1.9+, you can use source_location
require 'csv'
p CSV.new('string').method(:flock)
# => #<Method: CSV#flock>
CSV.new('string').method(:flock).source_location
# => ["/path/to/ruby/1.9.2-p290/lib/ruby/1.9.1/forwardable.rb", 180]
Note that this won't work...
DaffyMenu 扩展：弹出菜单扩展，为组件添加弹出式菜单功能 · App Inventor 2 中文网
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函数
ShowMenu 显示菜单(组件,菜单项列表)
显示绑定到指定组件的弹出菜单。
组件：组件类型，要绑定菜单的组件
菜单项列表：列表类型，菜单项文本列表
AddMenuItem 添加菜单项(组件,菜...
Warning message: In `…` : invalid factor level, NA generated
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If you are reading directly from CSV file then do like this.
myDataFrame <- read.csv("path/to/file.csv", header = TRUE, stringsAsFactors = FALSE)
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Principal component analysis in Python
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if __name__ == "__main__":
import sys
csv = "iris4.csv" # wikipedia Iris_flower_data_set
# 5.1,3.5,1.4,0.2 # ,Iris-setosa ...
N = 1000
K = 20
fraction = .90
seed = 1
exec "\n".join( sys.argv[1:] ) # N= ...
np.random.seed(seed)
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How can I get stock quotes using Google Finance API?
... very simple and useful.
For instance:
http://finance.yahoo.com/d/quotes.csv?s=GOOG+AAPL&f=snl1
Full details here:
http://www.gummy-stuff.org/Yahoo-data.htm
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Split a string by a delimiter in python
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You may be interested in the csv module, which is designed for comma-separated files but can be easily modified to use a custom delimiter.
import csv
csv.register_dialect( "myDialect", delimiter = "__", <other-options> )
lines = [ "MATCHES__STRING...
Why does csvwriter.writerow() put a comma after each character?
...the /names at the end and opens the page and prints the string to test1.csv :
3 Answers
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绘画动画组件 · App Inventor 2 中文网
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在画布上给定坐标处绘制一个点。
画多边形(坐标点列表,填充)
在画布上绘制多边形。
坐标点列表 应该是一个包含子列表（其中两个数字代表坐标）的列表。
第一个点和最后一个点不需要相同。例如 ((x1 y1) (x2 y2) ...