小编Geo*_*lls的帖子

有人知道如何使用所有内核来计算集成？我需要使用并行化或并行表,但如何？

 f[r_] := Sum[(((-1)^n*(2*r - 2*n - 7)!!)/(2^n*n!*(r - 2*n - 1)!))*
 x^(r - 2*n - 1), {n, 0, r/2}]; 


 Nw := Transpose[Table[f[j], {i, 1}, {j, 5, 200, 1}]]; 

 X1 = Integrate[Nw . Transpose[Nw], {x, -1, 1}]; 

 Y1 = Integrate[D[Nw, {x, 2}] . Transpose[D[Nw, {x, 2}]], {x, -1, 1}]; 

 X1//MatrixForm
 Y1//MatrixForm

我想快速解决以下问题:

f[r_] := Sum[(((-1)^n (2 r - 2 n - 7)!!)/(2^n n! (r - 2 n - 1)!))
             * x^(r - 2*n - 1), 
         {n, 0, r/2}]; 

Nw := Transpose[Table[f[j], {i, 1}, {j, 5, 200, 1}]]; 

X1 = Integrate[Nw . Transpose[Nw], {x, -1, 1}]

我可以使用以下代码快速得到答案:

$starttime = AbsoluteTime[]; Quiet[LaunchKernels[]]; 
DIM = 50; 
Print["$Version = ", $Version, "  |||  ", 
      "Number of Kernels : ", Length[Kernels[]]]; 

Nw = Transpose[Table[f[j], {i, 1}, {j, 5, DIM, 1}]]; 
nw2 = Nw.Transpose[Nw]; 
Round[First[AbsoluteTiming[nw3 = ParallelMap[Expand, …