将矩阵乘以并行 C# 中的标量向量

Question

我有两个数组字典，它们相乘并存储在字符串和 int[] 字典中。代码有效

public class Program
{
    public static void Main(string[] args)
    {
        int[] a = {1,0,3,4,0};
        int[] b = { 3, 0, 9, 10, 0};
        int[] c = {2,3,3,5,0};
        var ret = new Dictionary<string, int[]>();
        ret.Add("Jack", a);
        ret.Add("Jane", b);
        ret.Add("James", c);

        var multipliers = new Dictionary<string, int>();
        multipliers.Add("Jack", 2);
        multipliers.Add("Jane", 3);
        multipliers.Add("James", 5);

        var results = new Dictionary<string, int[]>();

        foreach (var item in ret)
        {
            int[] arr= new int[item.Value.Length];

            for (int i = 0; i < item.Value.Length; i ++)
            {
                int d = item.Value[i] * multipliers[item.Key];

                arr[i] = d;
            }
            results.Add(item.Key,arr);
        }
    }
}

最有效的方法是什么？有没有办法并行执行此操作？

Answer 1

以下代码片段是并行执行的方法：

var results = new ConcurrentDictionary<string, int[]>();

Parallel.ForEach(ret, pair =>
{
      var srcArr = pair.Value;
      var arr = new int[srcArr.Length];
      var multBy = multipliers[pair.Key];

      for (var i = 0; i < srcArr.Length; i++)
      {
           var d = srcArr[i] * multBy;

           arr[i] = d;
      }
      results[pair.Key] = arr;
});

将矩阵乘以并行 C# 中的标量向量

Multiplying a matrix by a vector of scalars in parallel C#

c#

arrays

parallel-processing

dictionary

iterator