how to select a random number from the existing matrix in each column

1 次查看（过去 30 天）
PRANAY DISHAN
PRANAY DISHAN 2018-2-7
评论： PRANAY DISHAN 2018-2-7
Dear friends, I need to select a random number from each column from the existing matrix to create a new row as shown below: I'm new to matlab. So please help me with this. Thank you.
A=[1 2 3 4;5 6 7 8;9 10 11 12]
Anew=[5 2 7 12]

请先登录，再回答此问题。

回答（2 个）

Roger Stafford
Roger Stafford 2018-2-7
编辑：Roger Stafford 2018-2-7
[m,n] = size(A);
Anew = A(randi(m,[1,n])+m*(0:n-1));
per isakson
per isakson 2018-2-7
编辑：per isakson 2018-2-7
It's smarter to use a for-loop
>> A
A =
1 2 3 4
5 6 7 8
9 10 11 12
>> [nrow,ncol] = size(A);
>> ix = randi([1,nrow],[1,ncol])
ix =
3 1 3 1
>> A(sub2ind(size(A),ix,1:ncol))
ans =
9 2 11 4

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