Java 如何在数组[]中插入double?
我试图在数组中插入双精度(D[I][j]=distance;),但我得到了以下错误:需要数组,但找到了双精度!!我看不出我的错误!!plz帮助 代码如下:Java 如何在数组[]中插入double?,java,arrays,Java,Arrays,我试图在数组中插入双精度(D[I][j]=distance;),但我得到了以下错误:需要数组,但找到了双精度!!我看不出我的错误!!plz帮助 代码如下: public static double[] D=new double[1000]; public static void main(String[] args) { // Data points matrice: X double X[][] = { {0.5,0.3,0.25,0.4},
public static double[] D=new double[1000];
public static void main(String[] args) {
// Data points matrice: X
double X[][] = { {0.5,0.3,0.25,0.4},
{0.4,0.33,0.26,0.7},
{0.1,0.9,0.34,0.77},
{0.1,0.98,0.28,0.4},
{0.75,0.63,0.51,0.6}};
for (int i=0; i<X.length-1;i++){
for (int z=0; z<X.length; z++){
double d=0;
for (int j=0; j<X[i].length;j++){
if (i!=z){
System.out.println(X[i][j]+"et"+X[z][j]);
d=d+Math.pow((X[i][j]-X[z][j]),2);
}else {d=0;}
System.out.println(d);
double distance= Math.sqrt(d);
D[i][j]=distance;
}
System.out.println("*****");
}
publicstaticdouble[]D=newdouble[1000];
公共静态void main(字符串[]args){
//数据点矩阵:X
双X[][]={{0.5,0.3,0.25,0.4},
{0.4,0.33,0.26,0.7},
{0.1,0.9,0.34,0.77},
{0.1,0.98,0.28,0.4},
{0.75,0.63,0.51,0.6}};
对于(int i=0;i而言,如果将D
的声明更改为以下内容,则它将起作用:
public static double[][] D = new double[5][5];
这使得D
成为一个二维数组而不是一维数组。D
只是一个1D数组D[i]
返回一个double,因此D[i][j]
无效公共静态双精度[][]D=新双精度[1000][1000];
谢谢您的帮助!