How do I add a column to table?
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m m
le 19 Nov 2015
Modifié(e) : MathWorks Support Team
le 5 Juin 2024
I have created a CSV file. When I use the "readable" function to load the table, I get an 8x10 table. I want to expand the table to an 8x11 table, where the 11th column should have the values from a function I have created. How do I do this?
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Walter Roberson
le 15 Mai 2024
Modifié(e) : MathWorks Support Team
le 5 Juin 2024
You can add a new table variable by using either dot notation or the "addvars" function. Dot notation adds new variables to the end of table. If you use the "addvars" function, then you can choose the location of the new table variable.
For example, this code creates a table and two column vectors. Then it adds the column vectors to the table as new variables.
LastName = ["Sanchez";"Johnson";"Li";"Diaz";"Brown"];
Age = [38;43;38;40;49];
Smoker = logical([1;0;1;0;1]);
T = table(LastName,Age,Smoker);
T.NewData = rand(5,1) % Dot notation adds new variable to end of table
MoreData = rand(5,1);
T = addvars(T,MoreData,'Before',1) % Add variable to beginning of table
If you generate a table variable name by evaluating an expression, you can pass it as the name of the new variable with either of these syntaxes.
TodaysData = "Data " + string(datetime("today"));
T.(TodaysData) = rand(5,1)
YesterdaysData = "Data " + string(datetime("today") - 1);
T = addvars(T,rand(5,1),'NewVariableNames',YesterdaysData,'Before',1)
For more information, see the following documentation:
Add, Delete, and Rearrange Table Variables
https://www.mathworks.com/help/matlab/matlab_prog/add-and-delete-table-variables.html
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Plus de réponses (3)
Sean de Wolski
le 20 Nov 2015
T.EleventhColumn = rand(8,1);
Where 'EleventhColumn' is the name you want for the variable.
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thang ngo
le 24 Juil 2020
This helps to pass a name as parameter:
name = 'new_column'
T.(name) = rand(8,1);
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Ehab Abdelkarim
le 3 Août 2018
you may want to check the following link https://de.mathworks.com/help/matlab/matlab_prog/add-and-delete-table-variables.html
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