How can I limit the maxmimum number of files to be loaded from a database?

Question

Sim 2012-10-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51033-how-can-i-limit-the-maxmimum-number-of-files-to-be-loaded-from-a-database

Suppose I have a database of 200k files (.mat files) but I want to randomly open only 15000 files out of those 200k. Is there a way to do that? Thanks in advance..

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matt Kindig 2012-10-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51033-how-can-i-limit-the-maxmimum-number-of-files-to-be-loaded-from-a-database#answer_62174

编辑：Matt Kindig 2012-10-16

在 MATLAB Online 中打开

You could use dir() to get the names of all *.mat files, and then use randperm() to randomly choose 15000 of them. Something like this:

matFiles = dir('*.mat');   %get all mat files
n = randperm(200e3);      %generate numbers between 1 and 200k in random order
n = n(1:15e3);            %get first 15k numbers
matFiles = matFiles(n);    %this will have 15k mat files, randomly chosen.