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Concatenate cell elements to a vector - fast C-Mex



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CELL2VEC - Concatenate cell elements to a vector
V = Cell2Vec(C)
  C: Cell array of any size and types:
        DOUBLE, SINGLE, (U)INT8/16/32/64, LOGICAL, CHAR.
      The elements of C can have different sizes.
  V: [1 x N] vector of all elements.

  C = {1, 2; 3, 4};
  V = Cell2Vec(C) % [1, 3, 2, 4] columnwise order
  M = reshape(V, size(C)) % [1, 2; 3, 4]

This C-Mex is up to 5 times faster than CAT(C{:}), HORZCAT or CELL2MAT.

Pre-compiled Mex-files can be downloaded:
Run the unit-test uTest_Cell2Vec after compiling.

Tested: Matlab 6.5, 7.7, 7.8, WinXP, 32bit
        Compiler: LCC2.4/3.8, BCC5.5, OWC1.8, MSVC2008
Assumed Compatibility: higher Matlab versions, Mac, Linux, 64bit

See also: CStr2String, CELL2MAT.

Comments and Ratings (5)


rokP (view profile)

Jan Simon

Jan Simon (view profile)

@Misha, you have to compile the C-file as described in the section "COMPILATION" in the help text - see "help Cell2Vec".


Misha (view profile)

Hi Jan,
Am I doing something wrong in trying to use this patch? I've dropped it in my main matlab folder. When I try to run:

a =

     1 5 9
     2 6 10
     3 7 11
     4 8 12

>> v = cell2vec(a)

i get an error:
Error using Cell2Vec (line 41)
Cannot find Mex file of Cell2Vec

Quant Guy

Quant Guy (view profile)

This is very useful tool and important submission. I was able trivially to reimplement the out of the box implementation of cell2mat which is very slow and got huge increases in overall speed!!



Better error messages and cleaned help section.

MATLAB Release
MATLAB 7.13 (R2011b)

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