数组对应元素相乘后想加的问题

Question

三个疑问
1.数组如何一一对应元素相乘
2.数组里的数如何想加
3.数组如何遍历
除此之外，此题要用到count方法

Answer 1

使用Nd4j 轻松操作多维数组

        <dependency>
            <groupId>org.nd4j</groupId>
            <artifactId>nd4j-native-platform</artifactId>
            <version>1.0.0-beta7</version>
        </dependency>

public static void main(String[] args) {
        
        INDArray nd1 =  Nd4j.create(new double[] {1,3,2,4});
        System.out.println(nd1);
        INDArray nd2 = Nd4j.create(new double[] {4,1,7,9});
        System.out.println(nd2);
        INDArray muli = nd1.muli(nd2);
        System.out.println(muli.toString());
        int sum = muli.sumNumber().intValue();
        System.out.println(sum);
        
        
    }