关于 matlab:randperm 随机 m×n 矩阵的子集

randperm subset of random m-by-n matrix

如何使用 randperm 选择 m×n 数据矩阵并输出该随机数据的较小子集？

即

1	newfile = randperm(data(m = 2000, n = 3)); %% save random m-by-n data as newfile

考虑这个例子：

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data = rand(8,6);
m = 4;
n = 2;

%# pick random rows
indX = randperm( size(data,1) );
indX = indX(1:m);

%# pick random columns
indY = randperm( size(data,2) );
indY = indY(1:n);

%# filter data
data2 = data(indX,indY)

请注意，R2011b 为 RANDPERM 引入了更简单的语法，允许您直接编写：

1 2	indX = randperm(size(data,1), m); indY = randperm(size(data,2), n);