Question

我的代码中提到的部分的目的是求解线性方程Ax = b“A”作为方形矩阵，“b”作为具有相同大小的矢量：

问题是，当我尝试在我的函数中使用Eigen函数时，编译失败：

#include "Eigen/Dense"
using namespace Eigen;

void StreamTemperature::avgTemperature() {

TotalDist = pm->get_total_dist();
vector<vector<double>> A(TotalDist, std::vector<double>(TotalDist));
vector<double> b_copy;
VectorXd x_eigen;                               //Eigen format! 
MatrixXd A_eigen(TotalDist, TotalDist);
VectorXd b_eigen(TotalDist);

for (int i = 0; i < (TotalDist - 1); i++) {
    A[i + 1][i] = 1.0;
    A[i][i] = 5.0;
    A[i][i + 1] = -1.0;
}
A[TotalDist - 1][TotalDist - 1] = b[TotalDist - 1][j] + c[TotalDist - 1][j];
b_copy.resize(TotalDist);
    for (int i = 0; i < TotalDist; i++) { b_copy[i] = 10.0; }

    for (int i = 0; i < TotalDist; i++)
    A_eigen.row(i) = Map<VectorXd>(A[i].data(), TotalTime);
    for (int i = 0; i < TotalDist; i++)
    b_eigen(i) = b_copy[i];
    x_eigen = A_eigen.colPivHouseholderQr().solve(b_eigen);

    for (int i = 0; i < TotalDist; i++) {
        x[i] = x_eigen(i);
    }

}

Eigen相关部分在anohter项目中运作良好但我在这里遇到问题！这是编译错误：

1>e:\suny-files\spring2017\summer2017\runforsyracusemin\itreecoolnewsw\eigen\src/Core/PlainObjectBase.h(659): error C2338: FLOATING_POINT_ARGUMENT_PASSED__INTEGER_WAS_EXPECTED
1>e:\suny-files\spring2017\summer2017\runforsyracusemin\itreecoolnewsw\eigen\src/Core/Matrix.h(250): note: see reference to function template instantiation 'void Eigen::PlainObjectBase<Eigen::Matrix<double,-1,-1,0,-1,-1>>::_init2<T0,T1>(int,int,double *)' being compiled
1>        with
1>        [
1>            T0=double,
1>            T1=double
1>        ]

有什么想法吗？！：|

Answer 1

在声明A_eigen时，尝试将TotalDist显式地转换为int。编译错误显示您正在传递浮点数，其中包含一个into。

同时检查TotalDist的值和A_eigen的尺寸。

使用特征函数失败

1 个答案: