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LU decomposition in c++
原标题:LU decomposition in c++
  • 时间:2012-05-10 13:18:26
  •  标签:
  • c++
  • arrays

目前,我有某些证据表明,我手法把一个阵列变成了上(u)和低(l)阵列。

I am using the doolittle method

我的法典:

#include <iostream>

using namespace std;

int main(){

    double a[10][10];
    double l[10][10];
    double u[10][10];
    double som=0;
    int RANG;
    cin >> RANG;
    for(int i=0; i<RANG; i++){
            for(int j=0; j<RANG;j++){
                    cin >> a[i][j];
            }
    }
    for(int i=0; i<RANG; i++){
            for(int j=0; j<RANG;j++){
                    u[i][j]=0;
                    l[i][j]=0;
            }
    }

    for(int i=0;i<RANG;i++) {
    l[i][i]=1;

        for(int j=i;j<RANG;j++) {
            for(int s=0;s<i-1;s++) {
                som+= l[i][s]*u[s][j];
            }
            u[i][j]=a[i][j]-som;
        }

        for(int k=i+1;k<RANG;k++) {
            double som=0;
            for(int s=0;s<i-1;s++) {
                som+=l[k][s]*u[s][i];
            }
            l[k][i]=(a[k][i]-som)/u[i][i];
        }
     }
     cout << "l:" << endl;
    for(int i=0; i<RANG; i++){
            for(int j=0; j<RANG;j++){
                    cout << l[i][j] << "	";
            }
            cout << endl << endl;
    }
    cout << "u: " << endl;
        for(int i=0; i<RANG; i++){
            for(int j=0; j<RANG;j++){
                    cout << u[i][j] << "	";
            }
            cout << endl << endl;
    }
    return 0;
}

如果你能够帮助......

PS:如果是属于这里,在数学站点可能更好。

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