How to set data in the same uitable

I have a 3 columns x 6 rows uitable, the user will input data in column 1 & column 2, column 3 will display the result of (column 2 - column 1). My code is:

T_Data = get(handles.t_data, 'data');
t11=T_Data{1,1};
t21=T_Data{2,1};
t31=T_Data{3,1};
t41=T_Data{4,1};
t51=T_Data{5,1};
t61=T_Data{6,1};
t12=T_Data{1,2};
t22=T_Data{2,2};
t32=T_Data{3,2};
t42=T_Data{4,2};
t52=T_Data{5,2};
t62=T_Data{6,2};
Net1= t12-t11;
Net2= t22-t21;
Net3= t32-t31;
Net4= t42-t41;
Net5= t52-t51;
Net6= t62-t61;

set(handles.T_Data{1,3},'data',Net1);

But I get the error:

Cell contents reference from a non-cell array object.

Why?

How can I display the number I wanted in the same uitable?

Thank you.

Answer 1

[Adam]

You haven't shown how you create your table, but I assume 'Data' is a numeric array, not a cell array.

Why would you create all those ugly variables though instead of just doing maths with the data as they already are in the array?

T_Data(1,3) = T_Data(1,2) - T_Data(1,1);

or simply

T_Data(:,3) = T_Data(:,2) - T_Data(:,1);

to do all at once, then after editing the whole thing just put it back into your table 'Data' property:

set(handles.t_data, 'data', T_Data);

Answer 2

[Image Analyst]

T_Data may be a cell array if some of the table entries were text/strings. In that case you'd need to use {} to get the contents of the numeric cells:

T_Data{1,3} = T_Data{1,2} - T_Data{1,1};

because using () would refer to actual cells, not the contents of the cells. If T_Data is not a cell, just do it like Adam said.

[yu yue]

You are right, I need to use{}. Thank you.