How to merge two different size matrix logically?

2015 2 25
3 个回答
回答已采纳
更新时间：2015 2 25
5 次查看（30 天）

0 个投票

Hello everyone, i have one matrix A = [0,1,2,...3600] and another one is B=[2,5,7,3600] what i want is to have matrix C(:,1)=[0,1,2....,3600] C(:,2)=[0,0,2,0,0,5,....3600] it should be as same size as A and if elements of B exist in A and that should be in the second column of C and the rest will be zero. Can you help please?

请先登录，再回答此问题。

 采纳的回答

Thorsten
Thorsten 2015-2-25
编辑：Thorsten 2015-2-25

0 个投票

Like this?
A = [0, 1, 2, 3, 4, 5, 7, 10];
B = [2, 5, 7];
C(:,1) = A;
C(end,2) = 0;
% ind = arrayfun(@(x)(find(x==A)), B);
% or
ind = find(ismember(A,B))
C(ind,2) = A(ind);

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Cladio Andrea
Cladio Andrea 2015-2-25
编辑：Cladio Andrea 2015-2-25
Hi Thorsten i have one more question, i would be very glad if you can answer, lets say now i need another matrix D lets say that counts the number of occurrence of the ones inside B matrix and then insert in the same size matrix let say:
A = [0, 1, 2, 3, 4, 5, 7, 10];
B = [2, 5, 7];
you found :
C = [0,0,2,0,0,5,7,0]; but in that case what i want is the occurence:
D = [0,0,1,0,0,1,1,0]
lets say i have something
A = [0, 1, 2, 3, 4, 5, 7, 10];
B = [2,5,5,7];
still C is the same but i want D also which should be:
C = [0,0,2,0,0,5,7,0];
D = [0,0,1,0,0,2,1,0];
<do you know how to solve that, thank you in advance

请先登录，再进行评论。

更多回答（2 个）

dpb
dpb 2015-2-25

0 个投票

C=[A zeros(size(A)]; % allocate
C(ismember(A,B),2)=B; % merge by position
Cladio Andrea
Cladio Andrea 2015-2-25

0 个投票

i love you guys!! i was dealing with that problem for hours and now i have 2 perfect answers!!!! Thank you so much!!!

类别

在 帮助中心 和 File Exchange 中查找有关 Matrix Indexing 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