Reshape a cell avoiding the loop

2013 6 11
3 个回答
回答已采纳
6 次查看（30 天）

0 个投票

I have the cell for example:
a =
'0.0' '0.0'
'0.1' '-0.4'
'0.1' '0.8'
'0.2' '2.3'
'0.3' '3.4'
'0.3' '-3.2'
'0.4' '-6.9'
'0.5' '-1.8'
'0.5' '7.2'
'0.6' '10.0'
and I want o reshape it like this.
d =
'0.0' '0.0' '0.3' '-3.2'
'0.1' '-0.4' '0.4' '-6.9'
'0.1' '0.8' '0.5' '-1.8'
'0.2' '2.3' '0.5' '7.2'
'0.3' '3.4' '0.6' '10.0'
I want to avoid the loop because the cell dimensions are very large. Thank you!

请先登录，再回答此问题。

 采纳的回答

Iain
Iain 2013-6-11

0 个投票

I think:
b = a';
c = reshape(b,cols,rows,numel(a)/cols/rows);
c = permute(c,[2 1 3]);
d = reshape(c,[],rows);
should do it...

6 个评论
显示 4更早的评论 隐藏 4更早的评论

numel(a)/cols/rows will always be equal to 1.
cols and rows variables refer to b?
Iain
Iain 2013-6-11
cols, is the number of columns in a, rows is the number of rows you want to segment by, so your updated example would have them both being two, and the third one dimension would be 5
So like this:
b = a';
c = reshape(b,2,2,numel(a)/2/2);
c = permute(c,[2 1 3]);
d = reshape(c,[],2);
but i get this:
d =
'0.0' '3.4'
'0.1' '-3.2'
'0.0' '0.4'
'-0.4' '0.5'
'0.1' '-6.9'
'0.2' '-1.8'
'0.8' '0.5'
'2.3' '0.6'
'0.3' '7.2'
'0.3' '10.0'
I think by accident you made a typo.
It should be:
reshape(c,2,[])
Thank you. I really don't understand how permute works.
Iain
Iain 2013-6-11
Permute swaps dimensions round.

请先登录，再进行评论。

更多回答（2 个）

the cyclist
the cyclist 2013-6-11
编辑：the cyclist 2013-6-11

0 个投票

d = [a(1:5,:),a(6:10,:)];
You can generalize this, of course, but you did not provide enough detail. If you always want the top half and bottom half, for example, you could use the size() command to determine the "height", and use half the height to determine the cutoff, which I just hard-coded as 5 here.

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

What if the the initial cell a has 100 rows and two columns (size 100x2). How do I cut the cell in sets of 5 avoiding the for loop. The resulting cell will have size 5x40 and it will start just as the cell d that I indicated above.

请先登录，再进行评论。

0 个投票

I am sorry I should be more explanatory. Let's say that I want to split in sets of 2 and concatenate them.
so it would be:
c =
'0.0' '0.0' '0.1' '0.8' '0.3' '3.4' '0.4' '-6.9' '0.5' '7.2'
'0.1' '-0.4' '0.2' '2.3' '0.3' '-3.2' '0.5' '-1.8' '0.6' '10.0'

类别

在 帮助中心 和 File Exchange 中查找有关 Logical 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