# How to convert each row in a cell array to a (1*n ) double matrix?

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Sarah A on 17 Jan 2020
Commented: Sarah A on 18 Jan 2020
Hello,
I have the attached cell array of size (164*102) where each cell is either contains 4-bits binary string or nothing (empty). How can I convert each row in the cell array to a seperate double matrix where each bit in the 4-bits string in a cell and the empty cell deleted.
For example,
if in Key array matrix we have the following row:
['0011', [ ], '1010', [ ], [ ], [ ], '0000', '1111']
then we convert it a seperate 1*16 double matrix:
[0,0,1,1,1,0,1,0,0,0,0,0,1,1,1,1].

David Hill on 17 Jan 2020
a=cell(1,164);
for j=1:164
a{j}=[Key{j,1:end}]-48;
end
Sarah A on 18 Jan 2020
Thank you all :)

Adam Danz on 17 Jan 2020
Edited: Adam Danz on 17 Jan 2020
I like David Hill's solution but here's another one because I already wrote it up so, why not share it?
% Insert empty char arrays in empty cells
Key(cellfun(@isempty,Key)) = {''};
% Convert char ('1111') to numeric vector ([1 1 1 1])
KeyVectors = cellfun(@(c){str2double(cellstr(c.').')},Key);
% Combine each row of cells
KeyRows = arrayfun(@(row){[KeyVectors{row,:}]},1:size(KeyVectors,1)).';
% Remove the NaN place holders that mark cells that were originally empty
KeyRows = cellfun(@(c){c(~isnan(c))},KeyRows);
Note that this matches David's solution other than my result is a column array and his is a row array.
isequal(KeyRows, a') % = true
##### 2 CommentsShowHide 1 older comment
Sarah A on 18 Jan 2020
the output in keyrows. thank you.

dpb on 17 Jan 2020
Use the dual representation of char() data as numeric that MATLAB will cast silently...
c=[{'0011'}, {[ ]}, {'1010'}, {[ ]}, {[ ]}, {[ ]}, {'0000'}, {'1111'}]; % example input
c=c(~cellfun(@isempty,c)); % keep non-empty cells only
m=strcat(cc{:})-'0'; % convert to numeric array
Result:
>> m =
0 0 1 1 1 0 1 0 0 0 0 0 1 1 1 1
>>
OTOMH, looks to me like you'll need to loop over the rows of the original array; don't see trivial way to vectorize this by row altho didn't work on it much...