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

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HN
HN el 11 de Jul. de 2022
Editada: Siddharth Bhutiya el 30 de Mzo. de 2023
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 comentarios
Stephen23
Stephen23 el 11 de Jul. de 2022
@HN: what do you expect this code to achieve?:
array2table(readtable(..))
HN
HN el 11 de Jul. de 2022
Editada: HN el 11 de Jul. de 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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Jonas
Jonas el 11 de Jul. de 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))';

Más respuestas (2)

Campion Loong
Campion Loong el 22 de Jul. de 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 el 30 de Mzo. de 2023
Editada: Siddharth Bhutiya el 30 de Mzo. de 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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