Assigning element of another array into another array based on index
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Mich
el 29 de Oct. de 2014
Comentada: Guillaume
el 16 de Mayo de 2018
I've stored the index of the elements of interest in an array, B, and would like to use the values in B to obtain the values of the elements in another array, A, at positions indicated in B.
e.g.
A = [5 4 4 5 6 6 8 5 8 5 14 11 3 2 4 5];
B = [1 2 4 8 10 12 16];
for i = 1: length(B)
if (A(B(i))== 5)
idx = [idx,i];
end
end
form my understanding, i should be able to get idx = 1 4 8 10 16 However, what i am getting is idx = 1 5 10 15
I'm not sure what is the problem as the logic of the code seems right to me.
can i also check what is the difference between array and matrix?
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Respuesta aceptada
Matt J
el 29 de Oct. de 2014
Editada: Matt J
el 29 de Oct. de 2014
You don't really need a loop at all and can do the whole thing in one line,
idx=B(A(B)==5)
4 comentarios
Matt J
el 29 de Oct. de 2014
Editada: Matt J
el 29 de Oct. de 2014
I never proposed anything that looks like B(...)== 5. The expression I wrote is B( A(B)==5 ).
I tested my proposal on your example data and it worked fine for me. So, whatever's causing your error, it's coming from something unposted.
Más respuestas (1)
vimala victor
el 16 de Mayo de 2018
hi, i have one array RL=[1 13 11 14 25 37 53 29 75 81 66 10 98 15 33 44 77 88 20 49 1 3 4 2 5 1 2 2 3 4 2 1 5 2 3 1 2 4 3 3]; That is first row defines the index values and second row is the values of corresponding index.(Eg.for index value 1 the value is 1,index value 13 the value is 3...) and IM= 44 14 98 88 20 13 11 37 77 25 81 20; How can i extract the corresponding IM indexing Values from RL using indexing. please ,can anyone help me to clarify my doubt with how to define in matlab coding
1 comentario
Guillaume
el 16 de Mayo de 2018
Please, start your own question rather than highjacking a very ancient one.
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