Delete columns from a matrix

2 次查看（过去 30 天）
Bill Symolon
Bill Symolon 2018-4-7
评论： Bill Symolon 2018-4-7
Hello, all. I know there are several posts about reducing matrices, but I haven't found one that answers my question. I have two matrices: class1 is 29x284214 and class2 is 29x492. I need to randomly delete columns from class1 until it has same number of columns as class2. I've tried the following code, but it's not very efficient and I'm hoping you can show me a better way.
if true
while length(class1) > length(class2)
index = randi(length(class1));
class1(:,index) = [];
end
end
I do not need to keep the original class1 matrix. Thanks for any help you can provide.

请先登录，再回答此问题。

采纳的回答

David Fletcher
David Fletcher 2018-4-7
diff=size(class1,2)-size(class2,2)
deletionList=randperm(size(class1,2),diff)
class1(:,deletionList)=[]

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Resizing and Reshaping 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