Convert 4 cell arrays into 4 columns in matrix

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MadjeKoe
MadjeKoe 2020-12-14
编辑： Adam Danz 2020-12-27
Hi guys!
Can anybody help me with converting 4 cell arrays that have different lengths into a matrix with 4 columns? I've been searching in the forum but I cannot get it to work. Thanks in advance!
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MadjeKoe
MadjeKoe 2020-12-14
编辑：MadjeKoe 2020-12-14
Yes, I am! Do you maybe know how I can fill in the blanks with NaN?
I'm trying to make the following piece of script work, which is why I wanted to put the cell arrays into a matrix (because you cannot subtract cell arrays from eachother). Do you happen to know an alternative way to make it work?
%% Relative orientations
influencer = [1 1 1 2 2 2 3 3 3 4 4 4];
target = [2 3 4 1 3 4 1 2 4 1 2 3];
relative_orientation= cell(12,1);
for i=1:12
relative_orientation{i} = orientation_target(influencer(i)) - orientation_target(target(i));
end
KALYAN ACHARJYA
KALYAN ACHARJYA 2020-12-14
"Yes, I am! Do you maybe know how I can fill in the blanks with NaN?"
Here
https://www.mathworks.com/matlabcentral/answers/267216-how-to-make-each-vector-of-equal-size-in-a-cell-by-adding-nan#answer_209066

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回答（1 个）

Adam Danz
Adam Danz 2020-12-14
编辑：Adam Danz 2020-12-24
This answer shows how to combine column vectors of different lengths into a matrix with NaN values as fillers.
https://www.mathworks.com/matlabcentral/answers/598216-creating-table-from-cell-array-data#answer_498787
Applied to your data, that would look like,
maxNumRow = max(cellfun(@(c) numel(c), orientation_target)); % max length
mPad = cell2mat(cellfun(@(c){padarray(c,[maxNumRow-numel(c),0],NaN,'Post')},orientation_target));
Sample of the result
mPad(1:10,:)
ans =
28 -87 -44 42
-15 -79 44 8
-70 -3 -18 30
50 -1 -41 75
-38 -87 32 -67
-82 -57 12 65
78 24 -24 -90
-63 66 -6 54
46 45 86 13
-1 0 83 -46
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MadjeKoe
MadjeKoe 2020-12-16
Yes, I know which ones are missing:
When targets = 1, I want to select orientation_target{1}, and make the others NaN. This is the same for the rest: if targets = 2, select orientation_target{2} etc.
Adam Danz
Adam Danz 2020-12-16
编辑：Adam Danz 2020-12-27
orientation_target{1} is a column vector. I don't understand "When targets = 1, I want to select orientation_target{1}, and make the others NaN."

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