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

5 vues (au cours des 30 derniers jours)
HN
HN le 11 Juil 2022
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 commentaires
Stephen23
Stephen23 le 11 Juil 2022
@HN: what do you expect this code to achieve?:
array2table(readtable(..))
HN
HN le 11 Juil 2022
Modifié(e) : HN le 11 Juil 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 le 11 Juil 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))';

Plus de réponses (2)

Campion Loong
Campion Loong le 22 Juil 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 le 30 Mar 2023
Modifié(e) : Siddharth Bhutiya le 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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