# vec2ind

Convert vectors to indices

## Syntax

``[ind,N] = vec2ind(vec)``

## Description

example

````[ind,N] = vec2ind(vec)` takes a matrix of vectors, each containing a single `1` and returns the indices of the ones, `ind`, and the number of rows in `vec`, `N`.`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.```

## Examples

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This example shows how to convert three vectors to indices and back, using both the `ind2vec` and `vec2ind` functions.

Define three vector with all zeros in the last row and convert it to indices.

```vec = [0 0 1 0; 1 0 0 0; 0 1 0 0]' [ind,n] = vec2ind(vec)```
```vec = 0 1 0 0 0 1 1 0 0 0 0 0 ind = 3 1 2 n = 4```

Convert the indices to vector, while preserving the number of rows.

`vec2 = full(ind2vec(ind,n)) `
```vec2 = 0 1 0 0 0 1 1 0 0 0 0 0```

## Input Arguments

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Vector representation of the indices, specified as a matrix of vectors, each containing a single `1`.

## Output Arguments

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Indices, returned as a row vector.

Number of rows of the input matrix, returned as a scalar.

## Version History

Introduced before R2006a