java - 计算系数的矩阵数组误差

Question

我有以下代码:

double[][] Coeficientes;
double[] VectorCoeficientes = new double[13];

int z = 0;
for(int i=0; i<longVector-LventanaReal; i+=saltos){
    VectorCoeficientes = CalcularCoeficientes(i);  (Step1)
    Coeficientes[z] = VectorCoeficientes;   (Step2)
    z++;
}

CalularCoeficientes 给了我一个长度为 13 的数组，然后 Step1 运行良好，但我无法执行 Step2，我想将该数组保存在矩阵 Coeficientes 中。

Answer 1

您缺少 Coeficientes 的初始化数组。

更改:

double[][] Coeficientes;

至:

double[][] Coeficientes = new double[someLength][]; // where someLength is some
                                                    // int value that determines
                                                    // the number of rows in your
                                                    // matrix

只有这样你才能运行作业:

Coeficientes[z] = VectorCoeficientes;

如果行数未知，请使用 List<double[]>最后将List转换为矩阵:

double[][] Coeficientes;
List<double[]> temp = new ArrayList<>();

for(int i=0; i<longVector-LventanaReal; i+=saltos){
    double[] VectorCoeficientes = CalcularCoeficientes(i);
    temp.add(VectorCoeficientes);
}

Coeficientes = temp.toArray(new double[temp.size()][13]);