Reshaping a Char Array

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Jack Gallahan
Jack Gallahan on 16 Oct 2020
Commented: Jack Gallahan on 17 Oct 2020
Hi,
I am currently working on a Project where I need to order a Char Array like shown below
A = ['12';'12';'12';'12';'12';'12';'12';'12';'34';'34';'34';'34';'34';'34';'34';'34';'56';'56';'56';'56';'56';'56';'56';'56';'78';'78';'78';'78';'78';'78';'78';'78';'AA';'AA';'AA';'AA';'AA';'AA';'AA';'AA';'BB';'BB';'BB';'BB';'BB';'BB';'BB';'BB';'CC';'CC';'CC';'CC';'CC';'CC';'CC';'CC';'DD';'DD';'DD';'DD';'DD';'DD';'DD';'DD'];
I want to re-arrange the char array like:
'1234'
'1234'
'1234'
'1234'
'1234'
'1234'
'1234'
'1234'
'5678'
'5678'
'5678'
'5678'
'5678'
'5678'
'5678'
'5678'
'AABB'
'AABB'
'AABB'
'AABB'
'AABB'
'AABB'
'AABB'
'AABB'
'CCDD'
'CCDD'
'CCDD'
'CCDD'
'CCDD'
'CCDD'
'CCDD'
'CCDD'
What is the best way to do that? I tried using reshape function but it doesn't seem to work for this case?
Thanks in advance.

Accepted Answer

Rik
Rik on 16 Oct 2020
This should do it:
A = ['12';'12';'12';'12';'12';'12';'12';'12';'34';'34';'34';'34';'34';'34';'34';'34';'56';'56';'56';'56';'56';'56';'56';'56';'78';'78';'78';'78';'78';'78';'78';'78';'AA';'AA';'AA';'AA';'AA';'AA';'AA';'AA';'BB';'BB';'BB';'BB';'BB';'BB';'BB';'BB';'CC';'CC';'CC';'CC';'CC';'CC';'CC';'CC';'DD';'DD';'DD';'DD';'DD';'DD';'DD';'DD'];
B=mat2cell(A,ones(size(A,1),1),2);
B=reshape(B,8,[]);
part1=B(:,1:2:end);part1=part1(:);
part2=B(:,2:2:end);part2=part2(:);
B=cell2mat([part1 part2]);
  1 Comment
Jack Gallahan
Jack Gallahan on 17 Oct 2020
Also is this the most efficient way to do this?
Because I have 134,217,728 Bytes each is 2 chars converting mat2cell and back takes to much time and memory. Sometimes matlab gives Out of Memory error. Is there another way?

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More Answers (1)

Ameer Hamza
Ameer Hamza on 16 Oct 2020
Something like this
A = ['12';'12';'12';'12';'12';'12';'12';'12';'34';'34';'34';'34';'34';'34';'34';'34';'56';'56';'56';'56';'56';'56';'56';'56';'78';'78';'78';'78';'78';'78';'78';'78';'AA';'AA';'AA';'AA';'AA';'AA';'AA';'AA';'BB';'BB';'BB';'BB';'BB';'BB';'BB';'BB';'CC';'CC';'CC';'CC';'CC';'CC';'CC';'CC';'DD';'DD';'DD';'DD';'DD';'DD';'DD';'DD'];
idx = find([1; diff(A(:,1))]);
B = reshape(string(A), diff(idx(1:2)), []);
B = B(:,1:2:end) + B(:,2:2:end);
B = char(B(:));
  6 Comments
Ameer Hamza
Ameer Hamza on 17 Oct 2020
It appears to be working in that case too
A = [repmat('12', 256, 1); repmat('34', 256, 1); repmat('56', 256, 1); repmat('78', 256, 1); repmat('AA', 256, 1); repmat('BB', 256, 1); repmat('CC', 256, 1); repmat('DD', 256, 1)];
idx = find([1; diff(A(:,1))]);
B = reshape(string(A), diff(idx(1:2)), []);
B = B(:,1:2:end) + B(:,2:2:end);
B = char(B(:));
The only case it will fail is if the second letter changes and the first letter remain same, for example
A = ['12';'12';'14';'14';'56';'56';'78';'78';'AA';'AA';'BB';'BB';'CC';'CC';'DD';'DD'];
In that case, following modification
idx = find([1; any(diff(A),2)]);
works, which is a more general form of the line in my answer and work for the original input too.
Jack Gallahan
Jack Gallahan on 17 Oct 2020
Edited: Jack Gallahan on 17 Oct 2020
The problem is, original data is ADC values which varies continously thus I can not rely on value of first 4 bit and second 4 bit. Values might be '9C', '00','15','0E,'28'..... and so on. The numbers on my first post was just to show the placement of chars that is needed.

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