## How can I make each cell array consistent in length?

### Zara Khan (view profile)

on 7 Mar 2019
Latest activity Commented on by Zara Khan

on 19 Mar 2019

### Jos (10584) (view profile)

In a cell array each element is 1Xlength. This length is not equal. I want to get the maximum length and then want to make each cell with same length by padding zeros in it.

### Jos (10584) (view profile)

on 18 Mar 2019

A final attempt to answer this question :-)
C = {1:4 1:2 ; 1:5 1:6 ; 1 1:3} % a m-by-n cell array
N = cellfun(@numel, C) % old lengths of cell elements
M = 3 ; % new length should be multiple of M
newN = M * ceil(N / M) % new lengths of cell elements
padfun = @(k) [C{k} zeros(1, newN(k) - N(k))] ;
C2 = arrayfun(padfun, 1:numel(C) , 'un', 0) ; % apply padding to all elements of C
C2 = reshape(C2, size(C)) % reshape (if needed)

Zara Khan

### Zara Khan (view profile)

on 19 Mar 2019
How can I put a condition here to check whether cell length is less than M or not . If it is less than M then only there will be padding otherwise not ?
Jos (10584)

### Jos (10584) (view profile)

on 19 Mar 2019
After you calculated the new N you can use this:
tf = ~(N < M) % true for the large cells
newN(tf) = N(tf) % reset to the old lengths
Zara Khan

### Zara Khan (view profile)

on 19 Mar 2019
Thank you . It works.

### tmarske (view profile)

on 7 Mar 2019
Edited by tmarske

### tmarske (view profile)

on 7 Mar 2019

%set up a dummy example
tst = {[1 1], [1 1 1 1 1], [1 1 1], [1]}
%get the maximum length
maxlen = max(cellfun(@length, tst))
tstPadded = cellfun(@(x)([x zeros(1, maxlen - length(x))]), tst, 'UniformOutput', false)

Jos (10584)

### Jos (10584) (view profile)

on 18 Mar 2019
Your code makes little sense. You overwrite A and width_needed.
I thought you needed the maximum of the lengths, so why don't you apply max?
Zara Khan

### Zara Khan (view profile)

on 18 Mar 2019
I dont want maxlength . I am making each cell a multiple of 32 . so i just want to add the extra places by zeros. maxlength will only find out maximum length among all.
Jos (10584)

### Jos (10584) (view profile)

on 18 Mar 2019
Your question reads otherwise ... " I want to get the maximum length and then want to make each cell with same length by padding zeros in it.

### Jos (10584) (view profile)

on 7 Mar 2019
Edited by Jos (10584)

### Jos (10584) (view profile)

on 8 Mar 2019

If you make them the same length, you can also store them in a matrix. In that case, my PADCAT function is your friend :-)
C = {[1 2] ; 1 ; [1 2 3]}
M(~tf) = 0

Zara Khan

### Zara Khan (view profile)

on 8 Mar 2019
This is shwoing wrong syntax : (M,tf) = padcat(C{:})
Jos (10584)

### Jos (10584) (view profile)

on 8 Mar 2019
My mistake, should be square brackets of course ... (I edited my answer).
Zara Khan

### Zara Khan (view profile)

on 18 Mar 2019
Jos (10584):
by using padcat I am getting a matrix where all coloumns are merged. That I dont want. I want to keep each cell as it is, just want want to add extra zeros. Like , first cell is 1X16, second is 1X31 and so on. I want to work on each indivisually. By adding extra zeros the first cell will be suppose 1X32 and so on. Remember I am dealing with mXn cell array.

### Jos (10584) (view profile)

on 18 Mar 2019

C = {1:3 4 ; 5:9 10:12 ; 13:14 15} % a m-by-n cell array
N = cellfun(@numel, C)
maxN = max(N(:))
padfun = @(v) [v zeros(1, maxN - numel(v))] ;
C2 = cellfun(padfun, C , 'un', 0)

Zara Khan

### Zara Khan (view profile)

on 18 Mar 2019
Each cell array consists of consequtives 0's and 1's. Padding with extra zero showing me error
size input must be scalar.
Jos (10584)

### Jos (10584) (view profile)

on 18 Mar 2019
I do not get this error in the above code for a cell array like this
C = {[1 0 0 1], [0 1] ; [1 0 1 0], [0 0 1]}
You should give more details about the error and the input ...
Zara Khan

### Zara Khan (view profile)

on 18 Mar 2019
A=cell(numImages,8);
B{k,j}=profile;
A=B;
len = cellfun(@length, B);
len1 = 32 * ceil(len/32);
width_needed=cell(numImages,8);
width_needed=len1-len;
I am making each cell a multiple of 32. Now my task is to pad extra zero after the multiplication. And I want to keep them as cell format , no merging will be done. Here the profile is varying in length. Basically it consists of consequtives 0's and 1's. I am attaching few pictures here too.