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Operator '-' is not supported for operands of type 'table'

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Hello everyone.
I have been trying to substract arrays. but I get an error message "
Operator '-' is not supported for operands of type 'table'
for
Q_dot{i} = (Q{i}(2:end,:) - Q{i}(1:end-1,:))./(Time{i}(2:end)-Time{i}(1:end-1))';
And part of the code is shown below. How the operator can be modified to handle this problem ? Or how should I modifit the data type ?
Q_dot = cell(1,6);
% table2array(Quat_dot);
Omg = cell(1,6);
for i=1:6
Q_dot{i} = (Q{i}(2:end,:) - Q{i}(1:end-1,:))./(Time{i}(2:end)-Time{i}(1:end-1))';
Omg{i} = zeros(length(Time{i}),3);
for k=1:length(Time{i})-1
% Something
end
end
Many thanks
  4 Comments
Stephen23
Stephen23 on 11 Jul 2022
@HN: what do you expect this code to achieve?:
array2table(readtable(..))
HN
HN on 11 Jul 2022
Edited: HN on 11 Jul 2022
That function is just useless @Stephen23. I just forgot to remove it. But I am not sure if this stil affects my question.

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Accepted Answer

Jonas
Jonas on 11 Jul 2022
try e.g.
(Quat{i}{2:end,:} - Quat{i}{1:end-1,:})./(Time{i}{2:end}-Time{i}{1:end-1})';
instead of
(Quat{i}(2:end,:) - Quat{i}(1:end-1,:))./(Time{i}(2:end)-Time{i}(1:end-1))';

More Answers (2)

Campion Loong
Campion Loong on 22 Jul 2022
If you are using table and addressing one variable at a time, dot subscripting (i.e. t.VarName(...) ) is often preferrable to braces (i.e. t{...} ). For one the code is more readable.
Also for reference, this doc topic has some examples on doing Calculations on Data in Tables.

Siddharth Bhutiya
Siddharth Bhutiya on 30 Mar 2023
Edited: Siddharth Bhutiya on 30 Mar 2023
The error message in the original question was about '-' not being supported on table. Starting R2023a, tables now support arithmetic operations so you could do things like the following.
T1 = table([1;3],[2;4]);
T2 = table([1;2],[3;4]);
T = T1 - T2
T = 2×2 table
Var1 Var2 ____ ____ 0 -1 1 0
T = (T1 - T2) ./ 10
T = 2×2 table
Var1 Var2 ____ ____ 0 -0.1 0.1 0
You can read more about this here: Direct Calculations on Tables and Timetables

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