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PADCAT

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PADCAT

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06 Feb 2009 (Updated )

concatenate vectors with different lengths by padding with NaN (v1.2, oct 2011)

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Description

PADCAT - concatenate vectors with different lengths by padding with NaN
 
    M = PADCAT(V1, V2, V3, ..., VN) concatenates the vectors V1 through VN
    into one large matrix. All vectors should have the same orientation,
    that is, they are all row or column vectors. The vectors do not need to
    have the same lengths, and shorter vectors are padded with NaNs.
    The size of M is determined by the length of the longest vector. For
    row vectors, M will be a N-by-MaxL matrix and for column vectors, M
    will be a MaxL-by-N matrix, where MaxL is the length of the longest
    vector.
 
    Examples:
       a = 1:5 ; b = 1:3 ; c = [] ; d = 1:4 ;
       padcat(a,b,c,d) % row vectors
          % -> 1 2 3 4 5
          % 1 2 3 NaN NaN
          % NaN NaN NaN NaN NaN
          % 1 2 3 4 NaN
       CC = {d.' a.' c.' b.' d.'} ;
       padcat(CC{:}) % column vectors
          % 1 1 NaN 1 1
          % 2 2 NaN 2 2
          % 3 3 NaN 3 3
          % 4 4 NaN NaN 4
          % NaN 5 NaN NaN NaN
 
 
    [M, TF] = PADCAT(..) will also return a logical matrix TF with the same
    size as R having true values for those positions that originate from an
    input vector. This may be useful if any of the vectors contain NaNs.
 
    Example:
        a = 1:3 ; b = [] ; c = [1 NaN] ;
        [M,tf] = padcat(a,b,c)
        % find the original NaN
        [Vev,Pos] = find(tf & isnan(M))
        % -> Vec = 3 , Pos = 2

This second output can also be used to change the padding value into something else than NaN.

       [M, tf] = padcat(1:3,1,1:4)
       M(~tf) = 99 % change the padding value into 99
 
    Scalars will be concatenated into a single column vector.
 
    See also cat, reshape, strvcat, char, horzcat, vertcat, isempty
             nones, group2cell (Matlab File Exchange)

Acknowledgements

Padadd inspired this file.

This file inspired Catpad.

MATLAB release MATLAB 7.6 (R2008a)
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Comments and Ratings (7)
20 Mar 2013 Harun Cetinkaya

Really thank you very much... It is really what i need...

09 May 2012 Joana

That was EXACTLY what I was looking for!
Many thanks

26 Oct 2011 Jonathan Sullivan

@German. You may want to check out the function catpad, it works on marticies and multidimensional arrrays.
http://www.mathworks.com/matlabcentral/fileexchange/33453

10 Aug 2011 German  
10 Aug 2011 German

Nice utility, can it be modified to work with matrices and multidimensional arrays?

01 Jul 2009 Laurence Johns  
04 Jun 2009 Kent Conover

Works as advertised - many thanks!

Updates
07 Oct 2011

added help on how to change the padding value using the secondary output

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