随机m×n矩阵的randperm子集

本文介绍了随机m×n矩阵的randperm子集的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

您如何使用randperm选择一个m×n的数据矩阵并输出该随机数据的较小子集?

how do you use randperm to select a m-by-n matrix of data and output a smaller subset of that random data?

即

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

推荐答案

请考虑以下示例:

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，使您可以直接编写:

Note that R2011b introduced an easier syntax for RANDPERM, allowing you to directly write:

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