Concatenate Tables with one variable having different lengths

Question

JLC 2019-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/467349-concatenate-tables-with-one-variable-having-different-lengths

评论： JLC 2019-6-16

I am trying to concatentate two tables within which the first variable is a string of different lengths, between tables.

T1 = table('Alpha', 33, 6); % Create first table
T2 = table('DoubleAlpha', 36, 8); % Create second table
TT = vertcat(T1,T2); % Concatenate tables

This gives an error:

Could not concatenate the table variable 'Var1' using VERTCAT.
Caused by:
    Error using vertcat
    Dimensions of arrays being concatenated are not consistent.

Is there an additional argument or way to initialize an empty table to permit vertcat?

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Answer 1

Walter Roberson 2019-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/467349-concatenate-tables-with-one-variable-having-different-lengths#answer_379412

编辑：Walter Roberson 2019-6-16

在 MATLAB Online 中打开

Later versions than yours reject your input syntax because of ambiguity about options versus inputs.

T1 = table({'Alpha'}, 33, 6); % Create first table
T2 = table({'DoubleAlpha'}, 36, 8); % Create second table
TT = vertcat(T1,T2); % Concatenate tables

The error message for your syntax in modern versions is

You might have intended to create a one-row table with the character vector 'Alpha' as one of its variables. To store text data in a table, use a string array or a cell array of character vectors rather than character arrays. Alternatively, create a cell array with one row, and convert that to a table using CELL2TABLE.