Spliting a n-by-3 Array into several different arrays.

2018 9 6
1 个回答
回答已采纳
更新时间：2018 9 7
13 次查看（30 天）

0 个投票

So, I have the following array:
v =
[1 2 3;
-1 2 -3;
0 0 0;
1 -2 3;
1 2 3;
1 2 3;
0 0 0;
0 0 0;
1 1 1]
I would like to split it into several arrays that I can call upon later as follows:
v_1 = [1 2 3; -1 2 -3],
v_2 = [1 -2 3; 1 2 3; 1 2 3],
v_3 = [1 1 1];
How would I go about doing this. I would like to use the zeros as an indication of where to create another variable with the array indicated.
Thank you.

5 个评论
显示 3更早的评论 隐藏 3更早的评论

Scott Salazar
Scott Salazar 2018-9-6
编辑：Scott Salazar 2018-9-6
I was hoping to use what Star Strider did in his example, and make a variation on it. Would this be a proper approach to my problem?
Scott Salazar
Scott Salazar 2018-9-6
So, I have something now, looks like the following:
v = [1 2 3; -1 2 -3; 0 0 0; 1 -2 3; 1 2 3; 1 2 3; 0 0 0; 0 0 0; 1 1 1];
idx = all((v),2);
idr = diff(find([1;diff(idx);1]));
D = mat2cell(v,idr(:),size(v,2));
D{1:2:end}
Where the value of D{1:2:end} is:
ans =
1 2 3
-1 2 -3
ans =
1 -2 3
1 2 3
1 2 3
ans =
1 1 1
Which is close to what I want, but I would again like to call them each from a vector. Thoughts?
Scott Salazar
Scott Salazar 2018-9-6
Excuse me, I meant to ask that the output will be in several different arrays.
dpb
dpb 2018-9-7
I know you asked that, but do NOT go down that perilous pathway..."There be dragons!"
Stephen23
Stephen23 2018-9-7
"...but I would again like to call them each from a vector. Thoughts?"
Do NOT do that. Magically accessing variable names is one way the beginners force themselves into writing slow, complex, buggy code. Here is why:
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

dpb
dpb 2018-9-6

0 个投票

v is not a vector but an array.
Star's code works on a vector; would be painful to extend to an array I think, as is. BUT, you can create a vector to use to find the split locations by his technique and then select the array instead of vector.
Define the auxiliary vector as
aux=all(v==0,2);

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Elementary Math 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