用于矢量数学的开源 C++ 库
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Open source C++ library for vector mathematics
提问by akauppi
I would need some basic vector mathematics constructs in an application. Dot product, cross product. Finding the intersection of lines, that kind of stuff.
我在应用程序中需要一些基本的向量数学结构。点积，叉积。寻找线的交点，那种东西。
I can do this by myself (in fact, have already) but isn't there a "standard" to use so bugs and possible optimizations would not be on me?
我可以自己做到这一点（事实上，已经做到了），但是没有一个“标准”可以使用，所以错误和可能的优化不会在我身上？
Boost does not have it. Their mathematics part is about statistical functions, as far as I was able to see.
Boost没有它。据我所知，他们的数学部分是关于统计函数的。
Addendum:
附录：
Boost 1.37 indeed seems to have this. They also gracefully introduce a number of other solutions at the field, and why they still went and did their own. I like that.
Boost 1.37 似乎确实有这个。他们还在该领域优雅地介绍了许多其他解决方案，以及为什么他们仍然坚持自己的解决方案。我喜欢。
采纳答案by PW.
Re-check that ol'good friend of C++ programmers called Boost. It has a linear algebra packagethat may well suits your needs.
回答by Johannes Schaub - litb
I've not tested it, but the C++ eigen libraryis becoming increasingly more popular these days. According to them, they are on par with the fastest libraries around there and their API looks quite neat to me.
我没有测试过它，但是 C++ eigen 库最近变得越来越流行。据他们说，它们与周围最快的库不相上下，而且它们的 API 在我看来非常简洁。
回答by ?zgür
Armadillo employs a delayed evaluation approach to combine several operations into one and reduce (or eliminate) the need for temporaries. Where applicable, the order of operations is optimised. Delayed evaluation and optimisation are achieved through recursive templates and template meta-programming.
While chained operations such as addition, subtraction and multiplication (matrix and element-wise) are the primary targets for speed-up opportunities, other operations, such as manipulation of submatrices, can also be optimised. Care was taken to maintain efficiency for both "small" and "big" matrices.
Armadillo 采用延迟评估方法将多个操作合并为一个，并减少（或消除）对临时操作的需求。在适用的情况下，优化操作顺序。通过递归模板和模板元编程实现延迟评估和优化。
虽然加法、减法和乘法（矩阵和元素）等链式运算是加速机会的主要目标，但也可以优化其他运算，例如子矩阵的操作。注意保持“小”和“大”矩阵的效率。
回答by Scott
回答by Scottie T
Check www.netlib.org, which is maintained by Oak Ridge National Lab and the University of Tennessee. You can search for numerical packages there. There's also Numerical Recipes in C++, which has code that goes with it, but the C++ version of the book is somewhat expensive and I've heard the code described as "terrible." The C and FORTRAN versions are free, and the associated code is quite good.
查看由橡树岭国家实验室和田纳西大学维护的www.netlib.org。您可以在那里搜索数字包。在 C++ 中还有Numerical Recipes，其中包含与之配套的代码，但本书的 C++ 版本有些昂贵，而且我听说这些代码被描述为“糟糕透顶”。C 和 FORTRAN 版本是免费的，相关代码相当不错。
回答by Laserallan
There is a nice Vector library for 3d graphics in the prophecy SDK:
预言 SDK 中有一个很好的 3d 图形矢量库：
Check out http://www.twilight3d.com/downloads.html
