ind2vec

(To be removed) Convert indices to vectors

ind2vec will be removed in a future release. For more information, see Transition Legacy Neural Network Code to dlnetwork Workflows.

For advice on updating your code, see Version History.

Syntax

vec = ind2vec(ind)

vec = ind2vec(ind,N)

Description

vec = ind2vec(ind) takes a row vector of indices, ind, and returns a sparse matrix of vectors, vec, containing a 1 in the row of the index they represent, as indicated by ind.

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.

vec = ind2vec(ind,N) returns an N-by-M sparse matrix, where N can be equal to or greater than the maximum index.

Examples

Convert Indices into Vector Representation

This example shows how to convert indices to vector representation using the ind2vec function.

Define four indices and then convert them to vector representation.

ind = [1 3 2 3];
vec = ind2vec(ind)

vec =
   (1,1)        1
   (3,2)        1
   (2,3)        1
   (3,4)        1

Input Arguments

ind — Indices

row vector

Indices, specified as a row vector.

N — Number of rows

scalar

Number of rows of the output matrix, specified as a scalar.

Output Arguments

vec — Converted vector of indices

matrix

Vector representation of the indices, returned as an N-by-M sparse matrix.

Version History

Introduced before R2006a

R2026a: ind2vec will be removed

ind2vec will be removed in a future release.

To learn more about data processing for neural networks, see these examples and topics:

• Preprocess Data for Domain-Specific Deep Learning Applications

• Datastores for Deep Learning

• Choose an App to Label Ground Truth Data

To convert integers to one-hot encoded vectors, use the onehotencode function instead.

For more information, see Transition Legacy Neural Network Code to dlnetwork Workflows.