运用matlab扩充矩阵/生成样本
matlab\u968f\u673a\u77e9\u9635\u751f\u6210\u95ee\u9898\uff0c\u6025\u554a\u6e90\u4ee3\u7801:
A=zeros(5,8);
for i=1:5
A(i,:)=randperm(8);
for j=1:8
if A(i,j)<=3;
A(i,j)=0;
else A(i,j)=1;
end
end
end
A
\u8fd0\u884c\u4e4b\u540e\u7684\u6548\u679c:
A =
0 1 0 1 1 1 1 0
1 1 1 1 0 0 1 0
0 0 1 1 1 0 1 1
1 1 0 0 1 0 1 1
1 1 1 1 0 0 0 1
len = length(A)
result = repmat(A,len,len)
\u5c31ok\u4e86\u3002
4^72= 2.2301e+043
这个量，计算机是受不了的(CPU主频现在一般是10^9量级，你自己算算看，要年吧)。
len = length(A)
result = repmat(A,len,len)
就ok了。
len = length(A)
result = repmat(A,len,len)
就ok了。
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绛旓細>> a=[1 2;3 4]a = 1 2 3 4 >> a([1 1 2 2],[1 1 2 2])ans = 1 1 2 2 1 1 2 2 3 3 4 4 3 3 4 4 >>
