Inserting new element after each element of an array
13 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Neeraj Chimwal
el 25 de Mzo. de 2021
I have an array arr = [2,4,6]
After converting this array elements to binary using de2bi(arr,'left-msb'), I get
0 1 0
1 0 0
1 1 0
Now what I want to do is to insert 0 after each 0 and 1 after each 1. So the result would be
0 0 1 1 0 0
1 1 0 0 0 0
1 1 1 1 0 0
I tried looping through the array, but since length of binary array is still 3, I can't loop through each element.
Can anyone please help me with this?
0 comentarios
Respuesta aceptada
Stephen23
el 25 de Mzo. de 2021
The MATLAB approach:
arr = [2,4,6];
mat = repelem(de2bi(arr,'left-msb'),1,2)
0 comentarios
Más respuestas (2)
David Goodmanson
el 25 de Mzo. de 2021
Editada: David Goodmanson
el 25 de Mzo. de 2021
Hi Neeraj,
not having the communications toolbox I used dec2bin instead, which gives a character array but it is basically the same idea and should work on a binary array I would think.
arr = [2,4,6];
a = dec2bin(arr)
s1 = size(a,1);
s2 = size(a,2);
c(1:s1,1:2:2*s2) = a;
c(1:s1,2:2:2*s2) = a
2 comentarios
David Goodmanson
el 26 de Mzo. de 2021
Hi Neeraj,
The index 1 : 2*s2 is twice as large as the number of columns in 'a'.
In the first step, by using 1:2:2*s2, 'a' is inserted into the odd numbered columns of the new matrix.
In the 2nd step, by using 2:2:2*s2, 'a' is inserted into the even numbered columns of the new matrix.
DGM
el 25 de Mzo. de 2021
You should be able to loop through the array regardless of its size. That said, you don't need to.
A=[1 2 3 4];
B=dec2bin(A);
expanded=B(:,round(0.5:0.5:size(B,2)));
which gives:
expanded =
000011
001100
001111
110000
2 comentarios
DGM
el 26 de Mzo. de 2021
Editada: DGM
el 26 de Mzo. de 2021
This bit:
0.5:0.5:size(B,2)
generates a vector like so:
[0.5 1.0 1.5 2.0 2.5 3.0 ... ]
rounding that vector gives us this:
[1 1 2 2 3 3 ... ]
so that we're referencing each element of B twice
Alternatively, you could use something like kron() to generate the same index vector:
kron([1 2 3 4],[1 1])
would yield
[1 1 2 2 3 3 4 4 ]
Ver también
Categorías
Más información sobre Data Type Conversion en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!