如何使用C中的条件测试从数组中删除某些元素？ [英] How to remove certain elements from an array using a conditional test in C?

问题描述

我正在编写一个程序，该程序通过一个整数数组并计算stdev来识别数据中的异常值。在这里，我想创建一个新数组，其中删除了已识别的异常值，以便重新计算avg和stdev。有办法可以做到吗？

I am writing a program that goes through an array of ints and calculates stdev to identify outliers in the data. From here, I would like to create a new array with the identified outliers removed in order to recalculate the avg and stdev. Is there a way that I can do this?

推荐答案

有一个非常简单的解决方案，可以改变您的思维方式 if 语句（实际上并没有出现在for循环中……可能想解决这个问题）。

There is a pretty simple solution to the problem that involves switching your mindset in the if statement (which isn't actually in a for loop it seems... might want to fix that).

float dataMinusOutliers[n];
int indexTracker = 0;
for (i=0; i<n; i++) {
    if (data[i] >= (-2*stdevfinal) && data[i] <= (2*stdevfinal)) {

        dataMinusOutliers[indexTracker] = data[i];
        indexTracker += 1;
    }
}

请注意，这并不是特别可扩展的， dataMinusOutliers 数组可能会有很多未使用的索引。您始终可以使用 indexTracker-1 来记录数组的实际大小，并创建另一个数组，将 dataMinusOutliers中的重要值复制到该数组中。有没有可能是更优雅的解决方案？是。这项工作符合您的要求吗？是的。

Note that this isn't particularly scalable and that the dataMinusOutliers array is going to potentially have quite a few unused indices. You can always use indexTracker - 1 to note how large the array actually is though, and create yet another array into which you copy the important values in dataMinusOutliers. Is there likely a more elegant solution? Yes. Does this work given your requirements though? Yup.

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