How do I add a column to table?

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?

Answer 1

[Walter Roberson]

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

Answer 2

[Sean de Wolski]

T.EleventhColumn = rand(8,1);

Where 'EleventhColumn' is the name you want for the variable.

[Theodore Wilkening]

this works best.

[Yifei]

The most convenient approach.

Answer 3

[thang ngo]

This helps to pass a name as parameter:

name = 'new_column'

T.(name) = rand(8,1);

Answer 4

[Ehab Abdelkarim]

you may want to check the following link https://de.mathworks.com/help/matlab/matlab_prog/add-and-delete-table-variables.html