矩阵数组错误

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++;
}

CalcularCoeficientes给了我一个长度为13的数组，然后Step1运行良好但我不能执行Step2，我想将该数组保存在矩阵Coeficientes中。

Answer 1

您错过了Coeficientes数组的初始化。

改变：

double[][] Coeficientes;

到：

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[]>并将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]);