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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
...
base R, unstack
unstack(df, V3 ~ V2)
# a b c
# 1 1 2 3
# 2 3 3 2
This may not be a general solution but works well in this case.
data
df<-structure(list(V1 = structure(c(1L, 1L, 1L, 2L, 2L, 2L), .Label = c("x",
"y"), class = "factor"), V2 = structu...
Compare version numbers without using split function
...tatic void Main()
{
string v1 = "1.23.56.1487";
string v2 = "1.24.55.487";
var version1 = new Version(v1);
var version2 = new Version(v2);
var result = version1.CompareTo(version2);
if (result > 0)
Console.WriteLine("version1 is gr...
用App Inventor 2做扫描仪App？从拍照到展示，手把手教你搭一套完整相机功...
.../电脑上无法拍照
Camera组件依赖实体设备的相机硬件，AI伴侣在电脑上运行时会直接闪退或显示黑屏。解决办法：一定要在真机上测试。
坑2：照片不显示
检查Image1的属性是否设了宽高（默认是「自动」，有时会导致显示异常...
Can someone give an example of cosine similarity, in a very simple, graphical way?
...counter2[k] for k in all_items]
return vector1, vector2
def cosim(v1, v2):
dot_product = sum(n1 * n2 for n1, n2 in zip(v1, v2) )
magnitude1 = math.sqrt(sum(n ** 2 for n in v1))
magnitude2 = math.sqrt(sum(n ** 2 for n in v2))
return dot_product / (magnitude1 * magnitude2)
l1 = ...
App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
... 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索
App Inventor 2 UrsPahoMqttClient 拓展 - ...
How to tell which commit a tag points to in Git?
...ev=7 --tags will show you something like the following:
f727215 refs/tags/v2.16.0
56072ac refs/tags/v2.17.0
b670805 refs/tags/v2.17.1
250ed01 refs/tags/v2.17.2
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...
Linux - Install redis-cli only
...s's answer, you can also install the Redis CLI by running
$ git clone -b v2.8.7 git@github.com:antirez/redis.git
$ make -C redis install redis-cli /usr/bin
This will build the Redis CLI and toss the binary into /usr/bin. To anyone who uses Docker, I've also built a Dockerfile that does this for ...
What is __future__ in Python used for and how/when to use it, and how it works
...
Or is it like saying "Since this is python v2.7, use that different 'print' function that has also been added to python v2.7, after it was added in python 3. So my 'print' will no longer be statements (eg print "message" ) but functions (eg, print("message", options)....
How to write WinForms code that auto-scales to system font and dpi settings?
...ionConfigurationSection>
<add key="DpiAwareness" value="PerMonitorV2" />
</System.Windows.Forms.ApplicationConfigurationSection>
This PerMonitorV2 is new since Windows 10 Creators Update:
DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
Also known as Per Monitor v2. An advancemen...
How can I brew link a specific version?
...: Aug 26 2014 15:14:01)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
$ brew unlink php54
$ brew switch php55 5.5.16
$ php --version
PHP 5.5.16 (cli) (built: Sep 9 2014 14:27:18)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Cop...