MATLAB中随机数问题

来源：百度知道 编辑：UC知道 时间：2024/05/26 04:31:45
请问：如何实现在一个50*50的矩阵中，1000个1和1500个-1 随机分布

>>A=randperm(2500);
>> for i=1:2500
if A(i)<=1000;
A(i)=1;
else A(i)=-1;
end
end
>> A=reshape(A,50,50)
A=
Columns 1 through 13

-1 1 1 1 1 1 1 -1 -1 1 1 -1 -1
-1 -1 -1 -1 -1 1 1 1 -1 -1 1 1 1
1 1 1 -1 -1 1 -1 -1 -1 1 1 -1 -1
-1 -1 -1 -1 -1 -1 -1 -1 1 -1 1 1 -1
1 1 -1 -1 -1 -1 1 -1 -1 -1 1 -1 -1
1 -1 -1 -1 1 -1 -1 1 -1 1 1 -1 -1
1 -1 -1 -1 -1 1 -1 1 1 -1 -1 -1 -1
1 -1 1 1 1 1 1 -1 -1 -1 1 -1 -1
-1 1 -1 1 -1 -1 -1 1 1 -1 1 -1 -1
-1 -1 1 -1 1 1