matlab更高效的随机链接创建

Question

我有这个部分做一些组中的一些随机链接。我可以让它更有效率吗？任何想法？

谢谢。

n=[10 ;10 ;10]; 
no_of_groups=size(n,1); 
for k=1:no_of_groups 
    if k==1 
     m{k,1}=randi(n(1), n(1),2);%random links between nodes of group1 
     m1=rand(n(1),1)/2+0.5;%random weight to edges 
     c{k,1} = cat(2,m{1},m1); 
    else 
     m{k,1}=randi([((k-1)*n(k-1)+1) (k*n(k))],n(k),2););%random links between nodes of group k 
     m1=rand(n(k),1)/2+0.5; 
     c{k,1} = cat(2,m{k,1},m1); 
    end 
end 
c=cat(1,c{:}); 

Answer 1

速战速决是预分配m和c和initiliaze他们的循环之外，以删除if条件：

n = [10 ;10 ;10]; 
no = size(n,1); 

% Preallocate 
m = cell(no,1); 
c = cell(no,1); 

% Initialize m and c 
m{1} = randi(n(1), n(1),2);%random links between nodes of group1 
m1 = rand(n(1),1)/2+0.5;%random weight to edges 
c{1} = cat(2,m{1},m1); 

for k = 2:no 
     m{k} = randi([(k-1)*n(k-1)+1 k*n(k)],n(k),2);%random links between nodes of group k 
     m1 = rand(n(k),1)/2+0.5; 
     c{k} = cat(2,m{k,1},m1); 
end 
c=cat(1,c{:}); 

这个循环是量化的，或者至少你可以避免使用细胞，这应该提高一点速度。