Java 中有没有支持 Array、List 进行算术运算的 Library? - V2EX
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Java 中有没有支持 Array、List 进行算术运算的 Library?

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  •   Reminders Oct 26, 2022 3740 views
    This topic created in 1281 days ago, the information mentioned may be changed or developed.

    类似下面这种运算:

    [1,2,3,4,5] + [2,1,2,1,3] - [0,1,3,0,2] = [3,2,2,5,6] 

    在 Python 中,有 numpy 可以支持,不知道 Java 中有没有类似的 Library 。

    加法 >>> a=numpy.array([2,4,5]) >>> b=numpy.array([1,1,1]) >>> a+b array([3, 5, 6]) 乘法 >>> a*b array([2, 4, 5]) 
    16 replies    2022-11-04 13:42:22 +08:00
    xiaopanzi
        1
    xiaopanzi  
       Oct 26, 2022
    如果只是简单的向量计算,自己简单封装一个?当然,如果对性能有要求,需要 SIMD 。
    debuggerx
        2
    debuggerx  
       Oct 26, 2022
    Java 不支持用户定义的运算符重载
    hanhuoer
        3
    hanhuoer  
       Oct 26, 2022 via iPhone
    stream
    thinkershare
        4
    thinkershare  
       Oct 26, 2022
    C#有类似 numpy 的 NumSharp, Java 运算符重载和自定义值类型的限制,导致写出来也不会多简洁直观。C#如果未来添加对 Slice 完全支持,C#应该可以写出和 numpy 一模一样的代码。
    jeesk
        5
    jeesk  
       Oct 26, 2022
    WispZhan
        6
    WispZhan  
       Oct 26, 2022 via Android
    shishiyi
        7
    shishiyi  
       Oct 26, 2022
    据我所知,jdk11 的 stream 没有直接方法实现该方式,但是 spring 的 Reactor 中 zip 方法就是干这种事情的
    XXWHCA
        8
    XXWHCA  
       Oct 26, 2022
    2 楼已经回复你了,java 不支持运算符重载,只能通过封装工具方法来实现
    shishiyi
        9
    shishiyi  
       Oct 26, 2022   1
    public static void main(String[] args) {
    Flux.zip(Flux.just(1,2,3), Flux.just(0, 1, 1))
    .map(tuple -> tuple.getT1() + tuple.getT2())
    .subscribe(System.out::println);
    }



    打印结果:1 ,3 ,4
    ql562482472
        10
    ql562482472  
       Oct 26, 2022
    这不是矩阵运算吗 apache-common-math
    impossibleshen
        11
    impossibleshen  
       Oct 26, 2022
    apache-common-math 或者 apache-common-math3 找找
    aguesuka
        12
    aguesuka  
       Oct 26, 2022   1
    vector api https://openjdk.org/jeps/338 正在孵化中
    knives
        13
    knives  
       Oct 26, 2022
    https://www.hipparchus.org/

    Hipparchus: a mathematics Library
    Hipparchus is a library of lightweight, self-contained mathematics and statistics components addressing the most common problems not available in the Java programming language.
    hingbong
        14
    hingbong  
       Oct 27, 2022 via Android
    @aguesuka 我记得之前看到过的也是这个
    learningman
        15
    learningman  
       Oct 27, 2022
    Java 还在 s1.equals(s2)呢。。。
    buliugu
        16
    buliugu  
       Nov 4, 2022
    DJL 的 NDArray ,几乎相当于 NumPy
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