cannot fill table with chars?
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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 个评论
Stephen23
2020-5-24
编辑:Stephen23
2020-5-24
"...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
2021-5-12
Dear Stephen,
thanks for your tip, indeed the solution of using a string array is very good.
Best.
采纳的回答
Tommy
2020-5-24
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 个评论
Giuseppe Degan Di Dieco
2021-5-12
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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