我正在编写一个C++程序来为一个大学任务找到一阶微分方程的解。该程序启动,然后一旦我输入迭代次数,我会得到错误消息“欧拉的method.exe已停止工作”。这是我的代码:C++程序已停止工作 - 求解常微分方程
#include <functional>
#include <vector>
using namespace std;
double f_r(double x, double r) {
return r;
}
double f_s(double x, double s) {
return -x/s;
}
double eulerstep(const function<double(double,double)>& f, double xsub0, double ysub0, double h) {
double ysub1 = ysub0+ h * f(xsub0,ysub0);
return ysub1;
}
double euler(const function<double(double,double)>& f, double xsub0, double ysub0, double h, int n) {
vector<double> xsub;
vector<double> ysub;
xsub[0] = xsub0;
ysub[0] = ysub0;
n = ysub.size();
for (int i=1; i<n; i++){
\t xsub[i+1] = xsub[i] + h;
\t ysub[i+1] = ysub[i] + h * f(xsub[i],ysub[i]);
\t cout << xsub[i] << " , " << ysub[i] << endl;
}
return ysub[n];
}
int main() {
int nsteps = 0;
cout << "Number of steps?" << endl;
cin >> nsteps;
double h = 1.0/nsteps;
double r = euler(f_r,0,1,h,nsteps);
double s = euler(f_s,0,1,h,nsteps);
return 0;
}
我相当肯定,问题在于如何我定义了我的载体,但我是新来使用他们,所以不能看到我的”出错了。我会非常感激,如果任何人都可以在我的方法指出的错误
感谢
当你在调试器中运行它时,你会得到多远? – mah
你可以使用'push_back()'向向量添加项目' – DimChtz
'xsub [0] = xsub0;'开始你的问题 – DimChtz