Question

我需要计算Vector3f的log10。我试过了：

Eigen::Vector3f valsingn = svd.singularValues()/svd.singularValues()(0);
valsingn = valsingn.log10();

但它不起作用。

main.cpp:145:27: error: ‘Eigen::Vector3f {aka class Eigen::Matrix<float, 3, 1>}’ has no member named ‘log10’; did you mean ‘log’?
     valsingn = valsingn.log10();

有没有办法用这个向量计算log10？

谢谢！

Answer 1

允许Eigen仍然使用SIMD的简单方法（我假设它已经启用）将是一个简单的基础更改：

valsingn = valsingn.array().log() / log(10.0);

或者，您可以将log10作为一元表达式传递：

 valsingn.unaryExpr(&log10); // You may have to wrap 
                             // log10 in a function of
                             // your own depending on
                             // the log10 overloads

Answer 2

对于纯系数函数，您需要移至array world：

Vector3f v, w;
w = v.array().log10();
w = log10(v.array());
Arrayt3f a, b;
b = a.log10();
b = log10(a);

Vector3f（Eigen Libs）的log10

2 个答案: