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转型产品经理必看 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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我的产品方法论
在整个互联网产品行业里,我属于产品新人,需要学习和掌握的东西还有很多,在此不敢高谈阔论,只把自己的理解记录下来。在这一年的修炼过程中,我慢慢形成了自己的一套做产品的方法,分享出来,算是...
Add new row to dataframe, at specific row-index, not appended?
...F[r,] <- newrow
existingDF
}
> insertRow(existingDF, newrow, r)
V1 V2 V3 V4
1 1 6 11 16
2 2 7 12 17
3 1 2 3 4
4 3 8 13 18
5 4 9 14 19
6 5 10 15 20
If speed is less important than clarity, then @Simon's solution works well:
existingDF <- rbind(existingDF[1:r,],newrow,exi...
How to compare versions in Ruby?
...u can use the Versionomy gem (available at github):
require 'versionomy'
v1 = Versionomy.parse('0.1')
v2 = Versionomy.parse('0.2.1')
v3 = Versionomy.parse('0.44')
v1 < v2 # => true
v2 < v3 # => true
v1 > v2 # => false
v2 > v3 # => false
...
C++ 读写xml方法整理(持续更新) - C/C++ - 清泛网 - 专注C/C++及内核技术
...,然后开始搜索它的文档。当解析器识别该文件的指定的位置,它会调用该部分相应的处理程序(如果您已经注册的一个)。该文件被输送到解析器,会被分割成多个片断,并分段装到内存中。因此expat可以解析那些巨大的文件...
Floating point vs integer calculations on modern hardware
... ++i below on measurements
Type v0 = (Type)(rand() % 256)/16 + 1;
Type v1 = (Type)(rand() % 256)/16 + 1;
Type v2 = (Type)(rand() % 256)/16 + 1;
Type v3 = (Type)(rand() % 256)/16 + 1;
Type v4 = (Type)(rand() % 256)/16 + 1;
Type v5 = (Type)(rand() % 256)/16 + 1;
Type v6 = (Type)(rand() %...
How to directly initialize a HashMap (in a literal way)?
...
can you add "as ImmutableMap.builder.put("k1","v1").put("k2","v2").build()" as the "of" method is limited to 5 pairs at maximum ?
– kommradHomer
Oct 15 '14 at 9:15
...
What are the details of “Objective-C Literals” mentioned in the Xcode 4.4 release notes?
..., nil]
[array objectAtIndex:i]
[NSDictionary dictionaryWithObjectsAndKeys: v1, k1, v2, k2, nil];
[dictionary valueForKey:k]
@[a, b, c]
array[i]
@{k1:v1, k2:v2}
dictionary[k]
This part is new. Expression Literals
When you have an expression (M_PI / 16 for example) you should put it insid...
How to convert variable (object) name into String [duplicate]
... substitute to get the name of a function argument:
myfunc <- function(v1) {
deparse(substitute(v1))
}
myfunc(foo)
[1] "foo"
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开源MQTT网关:EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区,为创新赋能!
...协议轻量高效积极的社区支持
缺点:可扩展性有限(<100k)没有集群支持缺少企业功能有限的云原生支持
EMQX 简介EMQX 项目于 2012 年底在 Github 发布,许可证为 Apache2,如今已成为世界上最具扩展性的 MQTT 消息服务器,被广泛...
TCP 的那些事儿(下) - 更多技术 - 清泛网 - 专注C/C++及内核技术
...可以看到:
接收端LastByteRead指向了TCP缓冲区中读到的位置,NextByteExpected指向的地方是收到的连续包的最后一个位置,LastByteRcved指向的是收到的包的最后一个位置,我们可以看到中间有些数据还没有到达,所以有数据空白区。...
