可以结束了。
z.B. double[] x_vektor = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
* window[0] ={1,2,3,4,5,6}; window.length = 6; 每次拷贝6个元素
* window[1] ={5,6,7,8,9,10}; window.length = 6; 第二次向右滑动4个元素后从第5个元素开始再次拷贝6个元素
* window[2] ={9,10,11,12,13,14};window.length = 6; 再次滑动四个以此类推
* window[3] ={13,14,15}; window.length = 5;
*
* public static void arraycopy(Object source, int srcIndex,
* Object dest, int destIndex, int length)
* public static double[] subArray(double[] orig, int off, int len)找到这个静态方法
{
if (off+len> orig.length) throw new IllegalArgumentException( "requested subarray exceeds array length ");
double[] window = new double[len];
System.arraycopy(orig, off, window, 0, len);
return window;
}
*/
[code=Java]
我想实现以下内容，不知道怎么弄啊
public double[] getWindow(){
double[] x_vektor = getXVektor();//原数组，里面是若干个double数，长度肯定大于6个
double[] window = new double[windowLength];// windowLength = 6建立subarray长度为6，每次向后跨过4个元素
for(int i = 0; (i < x_vektor.length)&&(i+4 < x_vektor.length); i = i+4 ){ // 这里只要i+4不越界就行
for(int j = 0; j <windowLength ; j++){
while(i+j < x_vektor.length){
window[j] = Arrays.copyOfRange(x_vektor, i+j , windowLength );//这个地方怎么弄啊
}
}System.out.print( " < < < < < < < < < < < < < < < < < < < < < < ");
}
return window;
}
[/code]
不知道如何将静态改为动态方法。
[code=Java]
public double[] getWindow(){
double sum = 0.0;
double[] wh = getWh();
double[] x_vektor = getXVektor();
double[] y = new double[windowLength];
double window[] = new double[windowLength];// windowLength = 6
for(int i = 0; i < x_vektor.length; i= i+2){
for(int j = 0; j < windowLength; j++){
if(i+j < x_vektor.length){
window[j] = x_vektor[i+j] * wh[j];
System.out.println( "print window: " + i + ": "+window[j]);
sum += window[j];
}
else{
break;
}
}
System.out.println( "print sum: " + i + ": "+sum);
}
System.out.println( "window.length: "+ window.length);
System.out.println(window[0]);
System.out.println(window[2]);
return window;
}
[/code]弄得差不多了才发现还是得变成arraylist，不然不能进行下面的计算，汗啊。。
[color=#FF0000]接下来是刚弄出来的，想返回array，但是不成功，咋弄啊[/color]
[code=Java]
public double[] getWindow(){
double sum = 0.0;
double[] wh = getWh();
double[] x_vektor = getXVektor();
ArrayList doubleList = new ArrayList();
double window[] = new double[windowLength];// windowLength = 6
for(int i = 0; i < x_vektor.length; i= i+2){
for(int j = 0; j < windowLength; j++){
if(i+j < x_vektor.length){
window[j] = x_vektor[i+j] * wh[j];
System.out.println( "print window: " + i + ": "+window[j]);
sum += window[j];
}
else{
break;
}
}
doubleList.add(sum);
System.out.println( "print doubleList(sum): " + i + ": "+doubleList);
}
double[] y = new double[doubleList.size()];
for(int i = 0; i < doubleList.size(); i++){
y[i] = doubleList.get(i);
//[color=#FF6600]这里的问题，把arraylist赋给array[/color]
System.out.println(y[i]);}
return y;
}
[/code]
搞定咯
[code=Java]
public double[] getWindow(){
double sum = 0.0;
double[] wh = getWh();
double[] x_vektor = getXVektor();
ArrayList <Double> doubleList = new ArrayList <Double> ();
double window[] = new double[windowLength];// windowLength = 6
for(int i = 0; i < x_vektor.length; i= i+2){
for(int j = 0; j < windowLength; j++){
if(i+j < x_vektor.length){
window[j] = x_vektor[i+j] * wh[j];
System.out.println( "print window: " + i + ": "+window[j]);
sum += window[j];
}
else{
break;
}
}
doubleList.add(sum);
System.out.println( "print doubleList(sum): " + i + ": "+doubleList);
}
double[] y = new double[doubleList.size()];
for(int i = 0; i < doubleList.size(); i++){
y[i] = doubleList.get( i ).doubleValue();
System.out.println(y[i]);}
return y;
}
[/code]
[解决办法]
window[j] += x_vektor[i+j];
[解决办法]
看了几遍才知道楼主想干啥，你这需要二维数组才能搞定，然而楼主你又没定义二维数组，修改如下：
- Java code
public double[][] getWindow() { double[] x_vektor = getXVektor(); double[][] window = new double[x_vektor.length / 4 + 1][windowLength]; for (int i = 0; i < x_vektor.length; i = i + 4) { for (int j = 0; j < windowLength; j++) { if (i + j < x_vektor.length) { window[i][j] = x_vektor[i + j]; System.out.println("print window: " + i + ": " + window[i][j]); } else { break; } } } return window; }