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How to sum a variable by group
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404
Using aggregate:
aggregate(x$Frequency, by=list(Category=x$Category), FUN=sum)
Category x
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Java array reflection: isArray vs. instanceof
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204
In most cases, you should use the instanceof operator to test whether an object is an array.
Ge...
QString to char* conversion
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114
Well, the Qt FAQ says:
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QStri...
Get current time as formatted string in Go?
...he time.Format() method.
t := time.Now()
fmt.Println(t.Format("20060102150405"))
prints out 20110504111515, or at least it did a few minutes ago. (I'm on Eastern Daylight Time.) There are several pre-defined time formats in the constants defined in the time package.
You can use time.Now().UTC() ...
你以为发传单真的这么简单吗?（提升成功率干货） - 更多技术 - 清泛网 - 专...
...单，另外一只手就像机械手臂，流水线似的朝人递。
No.4:有的哥们站在垃圾桶附近1m,路人拿了传单，走2步就扔垃圾桶里了。你不知道要珍爱传单，远离垃圾桶吗？
传单天使很重要，仪态、选择发给谁、甚至站的位置，都有影...
LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
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470
Whenever you use SingleOrDefault, you clearly state that the query should result in at most a ...
PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI
... a command-line processor this variable contains the script name since PHP 4.3.0. Previously it was not available.
'SCRIPT_NAME'
Contains the current script's path. This is useful for pages which need to point to themselves. The __FILE__ constant contains the full path and filenam...
What is the difference between Amazon SNS and Amazon SQS?
...plications. Messages can be stored in SQS for short duration of time (max 14 days). SNS distributes several copies of message to several subscribers. For example, lets say you want to replicate data generated by an application to several storage systems. You could use SNS and send this data to multi...
How can I convert a hex string to a byte array? [duplicate]
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4 Answers
4
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Debugging JavaScript in IE7
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edited Jan 20 '14 at 10:16
Simon
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answered D...