Removing empty cells from cell array

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Joel Schelander
Joel Schelander am 26 Mär. 2021
Kommentiert: Joel Schelander am 26 Mär. 2021
G is a cell array:
G={16x16 cell 16x16 cell 16x16 cell 16x16 cell 16x16 cell 16x16 cell}
Each cell look like this: G{1}=[1 [] 3 ; 4 [] 7]; (but 16x16)
I want to remove these empty cells []. I have tried
index = cellfun(@isempty, G) == 0;
Gnew = G(index)
Without success. How can I solve this?
  2 Kommentare
Stephen23
Stephen23 am 26 Mär. 2021
Ran in:
"Each cell look like this: G{1}=[1 [] 3 ; 4 [] 7]; "
I doubt that, as numeric arrays must be rectangular and cannot contain "holes":
[1,[],3;4,[],7]
ans = 2×2
1 3 4 7
Please upload some sample data in a mat file by clicking on the paperclip button.
Joel Schelander
Joel Schelander am 26 Mär. 2021
It is the output of several for loops, looks like this (see attached mat file)

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Stephen23
Stephen23 am 26 Mär. 2021
Bearbeitet: Stephen23 am 26 Mär. 2021
Ran in:
Most likely converting the nested cell array to numeric arrays is going to make processing your data easier:
S = load('G.mat');
GUD = S.GUD
GUD = 1×6 cell array
{16×16 cell} {16×16 cell} {16×16 cell} {16×16 cell} {16×16 cell} {16×16 cell}
GUD{1}
ans = 16×16 cell array
{0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 4.1165]} {[ 5.8874]} {[ 5.8474]} {0×0 double} {[ 5.8874]} {[ 4.5514]} {[ 6.3844]} {0×0 double} {[ 5.8474]} {[ 6.3844]} {[ 4.4562]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5.8874]} {[ 6.3844]} {0×0 double} {0×0 double} {[ 6.3844]} {[ 5.8474]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5.8874]} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6.3844]} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5.8474]} {[ 6.3844]} {0×0 double} {0×0 double} {[ 6.3844]} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5.8874]} {[ 6.3844]} {0×0 double} {0×0 double} {[ 6.3844]} {[ 5.8474]} {[ 4.1165]} {0×0 double} {[ 5.8874]} {[ 5.8474]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5.8874]} {0×0 double} {[ 4.2759]} {[ 5.8416]} {[ 5.8474]} {0×0 double} {[ 5.8416]} {[ 4.3722]} {[ 5.8874]} {0×0 double} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {[ 5.8416]} {[ 5.8474]} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6.3844]} {0×0 double} {[ 5.8416]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5.8874]} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6.3844]} {0×0 double} {[ 6.3844]} {[ 5.8874]} {0×0 double} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {[ 5.8416]} {[ 4.5514]} {[ 5.8874]} {0×0 double} {[ 6.3844]} {[ 5.8874]} {[ 4.2759]} {0×0 double} {[ 5.8416]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6.3844]} {[ 5.8416]} {0×0 double} {[ 4.7729]} {[ 6.3844]} {[ 6.3844]} {0×0 double} {0×0 double} {[ 6.3844]} {[ 5.8416]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5.8474]} {[ 6.3844]} {0×0 double} {0×0 double} {[ 6.3844]} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5.8474]} {0×0 double} {[ 6.3844]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6.3844]} {0×0 double} {[ 5.8416]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6.3844]} {[ 6.3844]} {0×0 double} {0×0 double} {[ 6.3844]} {[ 5.8416]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 4.4562]} {[ 5.8474]} {[ 6.3844]} {0×0 double} {[ 5.8474]} {[ 4.3722]} {[ 5.8416]} {0×0 double} {[ 6.3844]} {[ 5.8416]} {[ 4.7729]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double}
Convert:
for k = 1:numel(GUD)
idx = ~cellfun(@isempty,GUD{k});
tmp = zeros(size(GUD{k})); % or perhaps NAN.
tmp(idx) = [GUD{k}{idx}];
GUD{k} = tmp;
end
Checking:
GUD
GUD = 1×6 cell array
{16×16 double} {16×16 double} {16×16 double} {16×16 double} {16×16 double} {16×16 double}
GUD{1}
ans = 16×16
0 0 0 0 0 4.1165 5.8874 5.8474 0 5.8874 4.5514 6.3844 0 5.8474 6.3844 4.4562 0 0 0 0 0 0 0 0 0 0 5.8874 6.3844 0 0 6.3844 5.8474 0 0 0 0 0 5.8874 0 6.3844 0 0 0 0 0 6.3844 0 6.3844 0 0 0 0 0 5.8474 6.3844 0 0 6.3844 6.3844 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5.8874 6.3844 0 0 6.3844 5.8474 4.1165 0 5.8874 5.8474 0 0 0 0 5.8874 0 4.2759 5.8416 5.8474 0 5.8416 4.3722 5.8874 0 0 6.3844 0 0 0 0 0 0 0 0 6.3844 0 0 5.8416 5.8474 0 6.3844 0 0 0 0 0 6.3844 0 5.8416 0 0 0 0 0 0 0 0 0 0 5.8874 0 6.3844 0 0 0 0 0 6.3844 0 6.3844 5.8874 0 0 6.3844 0 0 0 0 0 0 0 0 6.3844 0 0 5.8416
If you really want to keep the (very inefficient and difficult to work with) nested cell arrays containing scalar numerics, then something like this:
for k = 1:numel(GUD)
idx = ~cellfun(@isempty,GUD{k});
GUD{k}(idx) = {0};
end

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