cannot fill table with chars?
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Budding MATLAB Jockey
le 24 Mai 2020
Commenté : Giuseppe Degan Di Dieco
le 12 Mai 2021
Hi I am having a pile of issues with the table features in matlab.
I can't figure out how to put a char array into a char variable of a table. I've been reading the table help files but Il'm missing something :(
x=[1;2;3];
y=[4;5;6];
T=table(x,y)
T =
3×2 table
x y
_ _
1 4
2 5
3 6
>> T.words = repmat({''}, 3, 1);
>> T(1,'words') = 'poop';
The number of table variables in an assignment must match.
>> T(1,3) = 'poop';
The number of table variables in an assignment must match.
>> T{1,3} = 'poop';
The value on the right-hand side of the assignment has the wrong width. The assignment requires a value whose width is 1.
2 commentaires
Stephen23
le 24 Mai 2020
Modifié(e) : Stephen23
le 24 Mai 2020
"...but Il'm missing something "
It isn't a character array. You defined it as a cell array of empty character vectors:
T.words = repmat({''}, 3, 1);
It is certainly possible to define words to be a character array:
>> T.words = char(nan(3,0))
T =
x y words
_ _ _____
1 4
2 5
3 6
>> T.words(1,1:4) = 'boat'
T =
x y words
_ _ _____
1 4 boat
2 5
3 6
>> size(T.words)
ans =
3 4
but that is likely to be useful only in some specific circumstances. I would imagine that most users would prefer a string array.
Giuseppe Degan Di Dieco
le 12 Mai 2021
Dear Stephen,
thanks for your tip, indeed the solution of using a string array is very good.
Best.
Réponse acceptée
Tommy
le 24 Mai 2020
x=[1;2;3];
y=[4;5;6];
T=table(x,y);
T.words = repmat({''}, 3, 1); % this creates a 3x1 cell array
After these lines, T.words is a cell array:
>> T.words
ans =
3×1 cell array
{0×0 char}
{0×0 char}
{0×0 char}
You can fill it like so:
T(1,'words') = {'a'};
T(2,3) = {'bcd'};
T{3,3} = {'e':'z'};
% alternatively,
T{3,3}{1} = 'e':'z';
Which results in this:
>> T
T =
3×3 table
x y words
_ _ ________________________
1 4 'a'
2 5 'bcd'
3 6 'efghijklmnopqrstuvwxyz'
1 commentaire
Giuseppe Degan Di Dieco
le 12 Mai 2021
Dear Tommy,
thanks for your suggestion, it really made me understanding the repmat function.
It helped me in changing the content of a data table, it was a cell array but I defined the substitute as a string.
Best.
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