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Ajuda do Scilab >> Funções Elementares > Set operations > unique

unique

remover todos os componentes duplicados de um vetor ou uma matriz

Seqüência de Chamamento

N = unique(M)
N = unique(M, orient)
[N, k] = unique(..)

Parâmetros

M

vetor ou matriz de números ou strings

orient

flag com valores possíveis : 1 ou "r", 2 ou "c". It can't be used if M is an hypermatrix.

N

  • If orient is not used: Vector of extracted M components sorted in ascending order.
  • If orient is used: Matrix of extracted M rows or columns, sorted in lexicographic ascending order.

k

Vector of indices of first encountered occurences, such that N(i) = M(k(i)) or N(i,:) = M(k(i),:) or N(:,i) = M(:,k(i)).

Descrição

unique(M) retorna um vetor que retém as entradas únicas de M em ordem ascendente.

unique(M,"r") ou unique(M,1)retorna as linhas únicas de M em ordem lexicográfica ascendente.

unique(M,"c") ou unique(M,2)retorna as linhas únicas de M em ordem lexicográfica ascendente.

Extracted components, rows or columns can be resorted in their initial order by sorting k. See the first example.

Exemplos

With some numbers:

M = int8([2  0  2  2  1  1  1  2  1  1  0  1  1  0  1  1
          0  1  2  0  1  2  2  0  1  1  2  0  1  0  0  0
          ])
[u, k] = unique(M)
[uc, kc] = unique(M, "c")

// Get unduplicated columns in initial order:
M(:, gsort(kc,"g","i"))
--> M 
 M = 
  2  0  2  2  1  1  1  2  1  1  0  1  1  0  1  1
  0  1  2  0  1  2  2  0  1  1  2  0  1  0  0  0

--> [u, k] = unique(M)
 u  =
  0
  1
  2

 k  =
   2.
   4.
   1.

--> [uc, kc] = unique(M, "c")
 uc  =
  0  0  0  1  1  1  2  2
  0  1  2  0  1  2  0  2

 kc  =
   14.   2.   11.   12.   5.   6.   1.   3.

--> // Get unduplicated columns in initial order:
--> M(:, gsort(kc,"g","i"))
 ans  =
  2  0  2  1  1  0  1  0
  0  1  2  1  2  2  0  0

With complex numbers:

i = %i;
c = [1+i, 1-i, -i, i, -i, 1+i]
[u, k] = unique(c)
[uc, kc] = unique(c, "c")
--> c = [1+i, 1-i, -i, i, -i, 1+i]
 c  =
   1. + i     1. - i  -i    i   -i    1. + i

--> [u, k] = unique(c)
 u  =
  -i    i    1. - i   1. + i

 k  =
   3.   4.   2.   1.

With some texts:

t = ["AB" "BA" "BA" "BA" "AB" "BA" "AB" "AB" "BB" "AA" "AB" "BA" "BA" "BA" "AA"
     "AA" "AA" "AB" "AA" "BB" "BB" "BB" "BA" "AB" "AB" "BB" "BB" "AB" "AB" "AA"
    ]
[u, k] = unique(t)
[uc, kc] = unique(t, "c")
 t  =
!AB  BA  BA  BA  AB  BA  AB  AB  BB  AA  AB  BA  BA  BA  AA  !
!AA  AA  AB  AA  BB  BB  BB  BA  AB  AB  BB  BB  AB  AB  AA  !

--> [u, k] = unique(t);
 u  =
!AA  !
!AB  !
!BA  !
!BB  !

 k  =
   2.
   1.
   3.
   10.

--> [uc, kc] = unique(t, "c")
 uc  =
!AA  AA  AB  AB  AB  BA  BA  BA  BB  !
!AA  AB  AA  BA  BB  AA  AB  BB  AB  !

 kc  =
   15.   10.   1.   8.   5.   2.   3.   6.   9.

Ver Também

  • members — count (and locate) in an array each element or row or column of another array
  • gsort — ordenação decrescente
  • vectorfind — acha, em uma matriz, linhas ou colunas que coincidem com um vetor
  • grep — acha correspondências de um string em um vetor de strings
  • union — extrai componentes da união de um vetor
  • intersect — returns the unduplicated elements or rows or columns met in both input arrays

Histórico

VersãoDescrição
6.0.2 unique() can now be used to unduplicate complex numbers.
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