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Patrick
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Naming VariableNames in a table based on a cell array

Asked by Patrick
on 6 Jul 2016
Latest activity Commented on by Peter Perkins
on 3 Aug 2016
I have an array data2 which is 1x576 and I have a cell array called data2_txt which is also 1x576. I have giving a small example below (the arrays im using are much larger)
data2=[1,5,3,5,6;1,2,4,12,6];
data2_txt={'Var1','Var2','Var3','Var4','Var5'}
Why do I get the error
Error using setVarNames (line 37)
The VariableNames property must contain one name for each variable in the table.
Error in table (line 305)
t = setVarNames(t,vnames); % error if invalid, duplicate, or empty"
When I use the following syntax
Table1=table(data2,'VariableNames',data2_txt);
I am able to get this to work if I use a loop. But given previous criticism of using loops vs vectorization in MatLab I am trying to avoid doing so to keep the code quick. Below is the code I can get working using a loop which is not very efficient
table3=table();
for i=1:length(data2)
table2a=table(data2(:,i),'VariableNames',data2_txt(i))
table3=horzcat(table3,table2a)
end
Any advice or direction would be greatly appreciated.

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1 Answer

Answer by Azzi Abdelmalek
on 6 Jul 2016
Edited by Azzi Abdelmalek
on 6 Jul 2016
 Accepted Answer

data2=[1,5,3,5,6;1,2,4,12,6]
data2_txt={'Var1','Var2','Var3','Var4','Var5'}
Table1=cell2table(num2cell(data2),'VariableNames',data2_txt)
%Or
data2=[1,5,3,5,6;1,2,4,12,6]
data2_txt={'Var1','Var2','Var3','Var4','Var5'}
v=mat2cell(data2,size(data2,1),ones(1,size(data2,2)))
Table1=table(v{:},'VariableNames',data2_txt)

  5 Comments

For large tables, matlab variable editor does not display the content anymore, just the properties of the table.
The content of the table is still the same.
As far as I know you cannot change that behaviour.
Thank you for the feedback Guillaume. Good thing to know for the future
There's no need to use cell arrays for this. Instead of converting to a cell array, use array2table, not the table constructor:
Table1=array2table(data2,'VariableNames',data2_txt);

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