清空筛选条件
清空筛选条件

Remove random columns from a big matrix?

4 次查看（过去 30 天）
stelios loizidis
stelios loizidis 2019-8-6
评论： Adam Danz 2019-8-6
Hello,
I have this issue: I want to randomly remove 3000 columns from a big matrix with size 1600X8500. below I have a code I wrote but when I run it the matlab outputs the following error: Index exceeds the number of array elements (1650)
A=[x1 x2 ...] % 1600by8500 matrix
k=randperm(size(A,1));
B=A;
B(:,k(1:3000))=[];
Your help is important!!

请先登录，再回答此问题。

采纳的回答

Adam Danz
Adam Danz 2019-8-6
If A is 1600 x 8500 as you describe, then the line below will only create 1600 elements so you can't use an index of 1:3000.
k=randperm(size(A,1));
Instead, you want to use the 2nd dimension of A
k=randperm(size(A,2));
% ^

更多回答（1 个）

madhan ravi
madhan ravi 2019-8-6
B(:,randperm(size(A,2),3000))=[]

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by