foreach (var i in qry)

回答: 在这个问题中，foreach (var i in qry)是一个foreach语句的示例。在这个语句中，qry是一个集合，而i是一个变量，用来存放集合中的每个元素。在每次循环中，foreach语句会从集合中取出一个新的元素值，并将其赋值给变量i。然后，可以在foreach块中执行一些操作，例如对元素进行处理或计算。当集合中的所有元素都被访问过后，foreach语句就会结束。\[1\]\[3\]
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相关问题

stata foreach

Stata's `foreach` command is used to loop over a set of values or variables. It allows you to perform the same set of actions on each item in the loop.

Here's an example of how you can use `foreach` in Stata:

foreach var of varlist var1 var2 var3 {
    display "`var'"
}

In this example, `var1`, `var2`, and `var3` are variables in your dataset. The `foreach` loop will iterate over these variables one by one, and the `display` command will show the name of each variable.

You can also use `foreach` to loop over a range of values or generate a sequence of values. For example:

foreach i of numlist 1/5 {
    display "`i'"
}

In this case, the loop will iterate over the numbers 1 to 5, and the `display` command will show each number in the sequence.

I hope this helps! Let me know if you have any further questions.