vec2ind

Convert vectors to indices

Syntax

[ind,n] = vec2ind(vec)


Description

ind2vec and vec2ind allow indices to be represented either by themselves or as vectors containing a 1 in the row of the index they represent.

[ind,n] = vec2ind(vec) takes one argument,

vec	Matrix of vectors, each containing a single 1

and returns

ind	The indices of the 1s
n	The number of rows in vec

Examples

Here three vectors are converted to indices and back, while preserving the number of rows.

vec = [0 0 1 0; 1 0 0 0; 0 1 0 0]'

vec =
     0     1     0
     0     0     1
     1     0     0
     0     0     0

[ind,n] = vec2ind(vec)

ind =
     3     1     2

n =
     4

vec2 = full(ind2vec(ind,n)) 

vec2 =
     0     1     0
     0     0     1
     1     0     0
     0     0     0