How to add variables to a table that are products of other variables
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T4H14
on 10 Oct 2017
Commented: Walter Roberson
on 11 Oct 2017
If I have a table of 46 variables and I want to add on new variables to this table which are the squares and cubes of some of these variables (columns 10 and 12-18) how can I accomplish this? I would be adding on 16 new variables (columns) in all to the original table.
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Accepted Answer
Walter Roberson
on 10 Oct 2017
cur_varnames = YourTable.Properties.VariableNames;
for K = [10, 12:18]
thisvarname = cur_varnames{K};
thisval = YourTable.(thisvarname);
sq_varname = [thisvarname '_squared'];
cu_varname = [thisvarname '_cubed'];
YourTable.(sq_varname) = thisval .^ 2;
YourTable.(cu_varname) = thisval .^ 3;
end
More Answers (1)
Andrei Bobrov
on 10 Oct 2017
Edited: Andrei Bobrov
on 10 Oct 2017
Let T - your table.
ts = reshape(T{:,[10,12:18]}.^reshape(2:3,1,1,[]),size(T,1),[]);
newname = cellstr(reshape(string(T(:,[10,12:18]).Properties.VariableNames)'...
+'_'+["squares","cube"],1,[]));
Tout = [T,array2table(ts,'VariableNames',newname)];
1 Comment
Walter Roberson
on 11 Oct 2017
(Note: the above code requires R2017a or later as it uses some properties of the new string data type)
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