to use ismember with arraycell
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gg =
4×1 cell array
{'A' }
{'A'}
{'B' }
{'A' }
[a,b]=ismember({'A'},gg)
a =
logical
1
b =
1
is not corret..i expect 1 1 0 1
1 commentaire
Stephen23
le 13 Oct 2024
"is not corret.."
It is correct: the first input 'A' is definitely a member of the second input:
ismember('A',{'A','A','B','A'})
"i expect 1 1 0 1"
ismember({'A','A','B','A'},'A')
Réponse acceptée
Sameer
le 13 Oct 2024
Modifié(e) : Sameer
le 13 Oct 2024
Hi Luca
The "ismember" function is designed to work with arrays, and when using it with cell arrays of strings, it checks for membership of each element in the cell array. However, it returns a single logical value for the entire array when you provide a single element to check against the cell array.
To achieve the result you expect , you can use "strcmp" to compare each element in the cell array individually.
Here's how you can do it:
gg = {'A'; 'A'; 'B'; 'A'};
a = strcmp('A', gg);
disp(a);
Please refer to the below MathWorks documentation link:
Hope this helps!
1 commentaire
Walter Roberson
le 13 Oct 2024
[a,b]=ismember({'A'},gg)
answers the question of whether 'A' occurs in gg, as a yes or no answer in a and the index inside gg it occurs in b . {'A'} is a single element so you get a single answer.
[a,b]=ismember(gg, {'A'})
on the other hand iterates through the elements of gg, and for each one answers the question of whether the element occurs within {'A'} . gg is length 4 so the answer in a will be of length 4 -- [gg{1} is in {'A'}, gg{2} is in {'A'}, gg{3} is in {'A'}, gg{4} is in {'A'}] .
Plus de réponses (2)
Pavl M.
le 13 Oct 2024
gg = {'A' ,'A','B' ,'A' }
a = cell2mat(gg)
g = zeros(1,length(a));
g(find(a=='A')) = 1
7 commentaires
Pavl M.
le 14 Oct 2024
Modifié(e) : Pavl M.
le 14 Oct 2024
clc
clear all
close all
%% Inputs ( from a methode ):
ex = 'STA';
dd = { 'STA', 'STAT', 'STA', 'STATT' } ;
%% Detection module:
% contains(dd, 'STA') is not yet implemented as built-in in TCE Octave
if length(ex)>1
strcmp(dd,ex)
else
a = cell2mat(dd);
g = zeros(1,length(a));
g(find(a==ex)) = 1
end
Steven Lord
le 13 Oct 2024
Both outputs are the same size as the first input.
gg = {'A'; 'A'; 'B'; 'A'};
[a1,b1]=ismember({'A'},gg)
[a2, b2] = ismember(gg, {'A'})
2 commentaires
Steven Lord
le 14 Oct 2024
Based on a revised example you posted as a comment on another answer, it looks like you're not trying to find cells in a cell array that are an exact match for a specific character. It looks like you're trying to find cells that contain that character anywhere inside the word they contain. If that is correct:
gg = { 'STA' , 'STAT' , 'STA' , 'STATT' }
contains(gg, 'A')
gg{3} = 'STEM' % Replace one of the words with one not containing 'A'
contains(gg, 'A')
Or you could use other string related functions instead of contains. Some examples include startsWith and endsWith.
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