array of natural numbers from 1 to n subset
46 次查看(过去 30 天)
显示 更早的评论
I have array of natural numbers from 1 to n. They are divided into m groups with m-1 elements -> m*(m-1)=n. I need to make n/2-length array whose elements are all elements from first group, last m-2 elements from second group, last m-3 elements from third group...zero elements from last group. For example 5*4=20: x=[1:20] I need 1,2,3,4; 6,7,8; 11,12; 16; Thanks!
2 个评论
采纳的回答
Thomas
2012-9-21
编辑:Thomas
2012-9-21
Ok, there are multiple ways to go about, I'll suggest a start to one, but you will have to develop the logic yourself
First step: Create your array of n natural numbers for Eg
n=20;
your_array=[1:n] % create your array
m=5; % number of elements in groups
To split the array into subgroups, you might have to use for loops. Or oyu could just split the array using indexing into groups of m or (m-1) as you need. http://www.mathworks.com/company/newsletters/articles/Matrix-Indexing-in-MATLAB/matrix.html I'm showing the example with the reshape command, your output matrix to work with will be ( I for one, know when my students have used outside help when I see the reshape command used in an introduction to matlab code.. :))
a=reshape(your_array,m,n/m)'
Now you need the m-1 elements from row 1, m-2 from row 2 and so on..
a(1,1;m-1) % this is only for first row
Develop your logic for the completion of the code
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!