为什么这些双打的返回值是 -1.#IND?

问题描述

我有:

double score = cvMatchContourTrees( CT1, CT2, CV_CONTOUR_TREES_MATCH_I1, 0.0 );
        cout<<score<<endl;

有些值返回为 -1.#IND.除此之外，正值是正常的，如 1.34543.

There are values returned as -1.#IND. Other than that, the positive values are normal, like 1.34543.

为什么会这样?我该如何解决?

Why does this happen? How do I solve it?

推荐答案

正如 Frederic 所说，这是 '不是数字' 由 Windows 上的 Visual Studio 构建的应用程序格式化.John D Cook 有一个优秀参考:

As Frederic says, it's the result of a 'Not a Number' being formatted by an application built with visual studio on windows. John D Cook has an excellent reference:

Windows 将 NaN 显示为 -1.#IND(IND"代表不确定")，而 Linux 显示为 nan.

Windows displays a NaN as -1.#IND ("IND" for "indeterminate") while Linux displays nan.

...

简而言之，如果您得到 1.#INF 或 inf，请查找溢出或被零除.如果得到 1.#IND 或 nan，则查找非法操作.

In short, if you get 1.#INF or inf, look for overflow or division by zero. If you get 1.#IND or nan, look for illegal operations.

如果您对字符串进行任何格式化，请注意截断；我在处理这些类型时遇到了相关问题自己的错误.

Watch out for truncations if you do any sort of formatting with your string; I've encountered related issues when handling these sorts of errors myself.

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