A compact “if” statement using “or” operator

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Sim
Sim el 1 de Jun. de 2023
Comentada: Sim el 2 de Jun. de 2023
A more compact way to write the “if” statement using “or” operator, than this one?
if i == 1 || i == 2 || i == 7 || i == 8 || i == 10
% ...
end
Something similar to this statement?
if i == [1 2 7 8 10]
% ...
end

Respuesta aceptada

Dyuman Joshi
Dyuman Joshi el 1 de Jun. de 2023
Editada: Dyuman Joshi el 1 de Jun. de 2023
Yes there is - ismember
vec = [1 2 7 8 10];
i = 4;
%Checks if elements in i are present in vec or not
ismember(i,vec)
ans = logical
0
if ismember(i,vec)
disp('if')
else
disp('else')
end
else
  7 comentarios
Dyuman Joshi
Dyuman Joshi el 1 de Jun. de 2023
Editada: Dyuman Joshi el 1 de Jun. de 2023
It is interesting to note that anyEq() is the fastest for first element and the slowest for the last element, and there timings of any() and ismember() are similar.
Edit - In the Overview section of the FileEx submission, Jan mentions - "Best case (first element matches): 99.99% faster for 1e6 elements (Matlab 2011b/64, MSVC 2008)"
%From the above tests done by James Tursa
n_any = 4.766502e-04;
n_is = 8.393297e-04;
n_eq = 4.046598e-06;
1-n_eq/n_any
ans = 0.9915
1-n_eq/n_is
ans = 0.9952
And it still holds.
Sim
Sim el 2 de Jun. de 2023
thanks to everyone, @Dyuman Joshi @Stephen23 @James Tursa @DGM, for your comments!

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