Combining cell arrays with empty doubles

Question

Michael Stollenwerk 2021-1-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/711743-combining-cell-arrays-with-empty-doubles

编辑： Jan 2021-1-8

Suppose I have two cell arrays, with

a = cell(1,2);
a{1} = 1;
b = cell(1,2);
b{2} = 2;

How can I quickly combine the two to give me

1×2 cell array
    {[1]}    {[2]}
    

?

In general, I want to combine several cell arrays of the same dimension, which at a given index either either all have {0×0 double} doubles or at most one of the cell arrays does not have a {0×0 double} double.

Thanks!

Michael

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Answer 1

Stephen23 2021-1-8

2
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https://ww2.mathworks.cn/matlabcentral/answers/711743-combining-cell-arrays-with-empty-doubles#answer_593573

编辑：Stephen23 2021-1-8

在 MATLAB Online 中打开

% slightly more complex example data:
a = {[],1;[],[]};
b = {[],[];2,[]};
c = {[],[];[],NaN};
%
tmp = cat(3,a,b,c);
[~,idp] = sort(cellfun('isempty',tmp),3);
sz = size(tmp);
[idr,idc] = ndgrid(1:sz(1),1:sz(2));
idx = sub2ind(sz,idr,idc,idp(:,:,1));
out = tmp(idx)
out = 2x2 cell array
    {0×0 double}    {[  1]}
    {[       2]}    {[NaN]}

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Answer 2

Jan 2021-1-8

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https://ww2.mathworks.cn/matlabcentral/answers/711743-combining-cell-arrays-with-empty-doubles#answer_593668

编辑：Jan 2021-1-8

在 MATLAB Online 中打开

Or simpler:

a = {1, []};
b = {[], 2};
c = cat(2, a, b);
c = c(~cellfun('isempty', c));
% Or:
fullCell = @(x) x(~cellfun('isempty', x));
c = cat(2, fullCell(a), fullCell(b));