清空筛选条件
清空筛选条件

Matlab Warning: Concatenation of empty arrays

7 次查看（过去 30 天）
Andrea
Andrea 2013-1-26
Hi,
I have write these lines in a matlab function
[r2, c2] = find(row == -2);
[r10, c10] = find(row == -10);
[r11, c11] = find(row == -11);
[r15, c15] = find(row == -15);
c = [c2 c10 c11 c15];
When I run the function on the matlab prompt I visualize this warning on the last line of the above code
Warning: Concatenation involves an empty array with an incorrect number of rows.
How can I resolve this warning?
Thanks in advance
Andrew

请先登录，再回答此问题。

回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-1-26
编辑：Azzi Abdelmalek 2013-1-26
Because c2 and c10, for example, have not the same size, then you can't concatenate them horizontally. Use instead
c = [c2 ;c10; c11; c15];
Walter Roberson
Walter Roberson 2013-1-26
Perhaps this would be suitable?
c = find(row == -2 | row == -10 | row == -11 | row = -15);
which could also be coded as
c = find(ismember(row, [-2, -10, -11, -15]));
  1 个评论
Andrea
Andrea 2013-1-28
row is a row vector can be contains or a single value between {-2,-10,-11,-15} or a combination of its.
I should select the max column of the values contained in row and in fact in my code I have this:
c = [c2 c10 c11 c15]; c = max(c);
I obtain the same behaviour with this instruction, for example:
c = max(find(ismember(row, [-2, -10, -11, -15])));
Thanks
Andrew

请先登录，再进行评论。

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