replace number with string in uitable

I have a very simple code in my gui where I want X and Y values to appear in a uitable. I want the last column to be editable so I can replace some of the numbers with characters (or string). But when I try with my code below the characters I set in are automatically replaced with NaN. How do I keep the character/string in the uitable cell?

My code:

    Y=[0.5360; 0.3490; 0.1990; 0.1190; 0.0780; 0.0560];
    X=[12; 10; 8; 6; 4; 2];
    T1=[X Y X Y];
    T1=num2cell(T1);
    set( handles.uitable1, 'Data', T1);

Answer 1

[Walter Roberson]

After your

 T1=num2cell(T1);

do

T1(:,end) = cellfun(@num2str, T1(:,end), 'uniform', 0);

Then

set( handles.uitable1, 'Data', T1, 'ColumnFormat', {'numeric', 'numeric', 'numeric', 'char'})

[JB]

PERFECT, thanks a lot Walter Roberson