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Reshape a cell avoiding the loop

Asked by Giorgos Papakonstantinou on 11 Jun 2013

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!

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Giorgos Papakonstantinou

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3 Answers

Answer by Iain on 11 Jun 2013
Accepted answer

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 Comments

Giorgos Papakonstantinou on 11 Jun 2013

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'  
Giorgos Papakonstantinou on 11 Jun 2013

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 on 11 Jun 2013

Permute swaps dimensions round.

Iain
Answer by the cyclist on 11 Jun 2013
Edited by the cyclist on 11 Jun 2013
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 Comment

Giorgos Papakonstantinou on 11 Jun 2013

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.

the cyclist
Answer by Giorgos Papakonstantinou on 11 Jun 2013

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'

0 Comments

Giorgos Papakonstantinou

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