C ++中的线性预警 [英] Linear Alegebra in C++
问题描述
大家好，
我正在寻找一个快速，高效（调整速度，而不是大小）和
成熟的C ++代码来做一些数值与...合作。我查看了
模板数值工具包，oonumerics.org网页声称是
lapack ++的继承者。但从表面上看，似乎没有lapack ++的所有功能，更不用说成为其继承者了。在
另一方面，它可能会更快。我还没检查过。 Lapack ++是
应该是ublas的包装器。 TNT似乎没有任何东西可以用ublas做b $ b。它经常没有更新。还有一个
cpplapack正在独立于lapack ++开发。
我的问题是TNT的速度有多快。它比其他包快吗？如果
您选择了一个套餐，您会选择哪个套餐？
谢谢，
RS
Hi all,
I am looking for a fast, efficient (tuned for speed, not size) and
mature C++ code to do some numerical work with. I have looked at the
Template Numerical Toolkit, which the oonumerics.org web page claims is
a successor to lapack++. But on the surface it doesn''t seem to have all
the functionalities of lapack++, let alone being its successor. On the
other hand, it may be faster. I haven''t checked that yet. Lapack++ is
supposed to be a wrapper for ublas. TNT doesn''t seem to have anything to
do with ublas. It hasn''t been updated that often. There is also a
cpplapack that is being developed independently of lapack++.
My question is how fast is TNT. Is it faster than the other packages? If
you were to chose one package, which one would you chose?
Thanks,
RS
推荐答案
RS写道：
RS wrote:
我正在寻找快速，高效（调整速度，而不是尺寸）和
成熟的C ++代码做一些数值工作。我查看了
模板数值工具包，oonumerics.org网页声称是
lapack ++的继承者。但从表面上看，似乎没有lapack ++的所有功能，更不用说成为其继承者了。在
另一方面，它可能会更快。我还没检查过。 Lapack ++是
应该是ublas的包装器。 TNT似乎没有任何东西可以用ublas做b $ b。它经常没有更新。还有一个
cpplapack正在独立于lapack ++开发。
我的问题是TNT的速度有多快。它比其他包快吗？如果你要选择一个包裹，你会选择哪一个？
I am looking for a fast, efficient (tuned for speed, not size) and
mature C++ code to do some numerical work with. I have looked at the
Template Numerical Toolkit, which the oonumerics.org web page claims is
a successor to lapack++. But on the surface it doesn''t seem to have all
the functionalities of lapack++, let alone being its successor. On the
other hand, it may be faster. I haven''t checked that yet. Lapack++ is
supposed to be a wrapper for ublas. TNT doesn''t seem to have anything to
do with ublas. It hasn''t been updated that often. There is also a
cpplapack that is being developed independently of lapack++.
My question is how fast is TNT. Is it faster than the other packages? If
you were to chose one package, which one would you chose?
我在这里没有帮助，你可能会在其他地方得到更好的答案。这个
组专注于C ++语言，而不是第三方库
（参见 http://www.parashift.com/c++-faq-lit....html#faq- 5.9）。
对不起。
干杯！ --M
I''m no help here, and you''ll likely get better answers elsewhere. This
group focuses on the C++ language proper, not third-party libraries
(see http://www.parashift.com/c++-faq-lit....html#faq-5.9).
Sorry.
Cheers! --M
你知道如何用C ++编写二次方程吗？
Do you know how to write the quadratic equation in C++?
sonhado ... @ gmail.com写道：
sonhado...@gmail.com wrote:
你知道如何用C ++编写二次方程吗？
Do you know how to write the quadratic equation in C++?
是的。一种方法是：
float qe（const float a，const float b，const float c）
{
const float discriminant = b * b - 4.0 * a * c;
if（discriminant< 0）
{
cout<< 根是虚构的。 <<结束;
}
其他
{
const float denom = 2 * a;
cout<< 根是： << （-b +判别）/ denom
<< ， << （-b-discriminant）/ denom
<<结束;
}
}
干杯！ --M
Yes. One way would be:
float qe( const float a, const float b, const float c )
{
const float discriminant = b*b - 4.0*a*c;
if( discriminant < 0 )
{
cout << "Roots are imaginary." << endl;
}
else
{
const float denom = 2*a;
cout << "Roots are: " << (-b+discriminant) / denom
<< ", " << (-b-discriminant) / denom
<< endl;
}
}
Cheers! --M
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