Randomly generate a vector containing integers. Extract items from odd positions using a single command line
显示 更早的评论
Hi guys. How can i randomly generate a vector containing integers and extract items from odd positions using a single command line?
Thank you!
采纳的回答
Hi Dacian,
indexing an expression (e.g. randi(100,10,1)(1:2:9)) is not possible in Matlab.
Here is a workaround using groupsummary() that generates 10 random integers between 1 and 100 and returns the numbers at odd indices:
groupsummary(randi(100,10,1), reshape(repmat(1:2:10,2,1),[],1), @(x)x(1))
You can also put this into an anonymous function (although if creating an anonymous function first is an option, there would be much simpler solutions, of course):
randi_oddIdx = @(imax,n)groupsummary(randi(imax,n,1), reshape(repmat(1:2:n,2,1),[],1), @(x)x(1))
Note that this only works for even numbers of random integers!
Best, Konrad
更多回答（1 个）
Walter Roberson
2022-3-3
struct('d',randi(100,1,1)).d(1:2:end)
Does not require that the number of values is even.
Seems pointless to me unless you are carefully controlling the random seed. Just wastes time and is unclear. The numbers are not more random by taking every second one instead of all of them.
类别
在 帮助中心 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
