Introduce columns in a table- Variables

Question

Patrick Brown 2017-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/323835-introduce-columns-in-a-table-variables

评论： Patrick Brown 2017-2-8

Hi, I want to introduce columns in a table, then I write Table.a but a is a variable string and I want that the column has the name of this string how I can do that???

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Patrick Brown 2017-2-7

is not possible no?

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Answer 1

Steven Lord 2017-2-8

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This is possible using a slight variation of the cyclist's initial approach.

% Sample data
A = magic(4);
% Create the table to which you want to add data
T = array2table(A, 'VariableNames', {'first', 'second', 'third', 'fourth'})
% Define the new variable and the data it should contain
newvariable = 'fifth';
x = [20; 17; 8; 2];
% Add the new variable to the table T
T.(newvariable) = x

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Patrick Brown 2017-2-8

Thanks!!!

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Answer 2

the cyclist 2017-2-7

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% Create the table
x = rand(3,1);
tbl = table(x);
% Create the string that contains the variable name
varString = 'x';
% Access that variable, using the string
tbl(:,varString)

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Patrick Brown 2017-2-8

thanks for the answer

it is really tricky I think because the thing I want maybe it is no possible

for example a='velocity' - a string and when I create a column in a table Table.a I want that the name will be Table.velocity

maybe it is no possible but thanks again

the cyclist 2017-2-8

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This is also possible:

% Create the string that contains the variable name
varString = {'velocity'};
% Create the table with the name
x = rand(3,1);
tbl = table(x,'VariableName',varString);