How do I assign a value to a particular column in a subsection of a table?
36 views (last 30 days)
Show older comments
Using the example testing data on https://www.mathworks.com/help/matlab/matlab_prog/calculations-on-tables.html, I would like to write something like
T(T.Gender=='female',:).Test2 = 100
I can do something similar with array data, but get an error with table data. Is there a simple way to make this work without having to create a dummy array of the appropriate length for my constant value?
T = readtable(fullfile(matlabroot,'examples','matlab','testScores.csv'),...
'ReadRowNames',true)
T.Gender = categorical(T.Gender)
% select a subset of the rows
rows = T.Gender=='female'
% this works, and is my usual way of working with array data
A = table2array(T(:,2:4))
A(rows,2) = 100
% This works, but is ugly
T(rows,:).Test2 = 100 * ones(size(T(rows,:).Test2))
% This does not work
T(rows,:).Test2 = 100
Error: 'To assign to or create a variable in a table, the number of rows must match the height of the table. '
0 Comments
Accepted Answer
Walter Roberson
on 9 May 2017
T{rows,'Test2'} = 100;
2 Comments
Peter Perkins
on 10 May 2017
For assigning to just one variable in a table, you might find
T.Test2(rows) = 100;
more readable.
More Answers (0)
See Also
Categories
Find more on Logical in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!