# cat

concatenate several arrays

## Calling Sequence

    y=cat(dims,A1,A2,...,An)

## Arguments

dims

  a positive real scalar.

A1,A2,..An

  scalars, vectors, matrices or multi-arrays, or cell arrays. `A1,A2,...,An` must have the same size (excluding the dimension number `dims`). `size(A1,i)=size(A2,i)=...=size(An,i)` for `i` different of dims and `size(A1,dims), size(A2,dims),...,size(An,dims)` can be different.

y

  a scalar, vector, matrix or multi-array, or cell array `y` has the same type as `A1,A2,...,An`.

## Description

`y=cat(dims,A1,A2,...,An)` : `y` is the result of the concatenation of the input arguments `A1,A2,...,An`.

If `dims=1`, then the concatenation is done according to the rows

`A1=[1 2 3 ; 4 5 6]`; `A2=[7 8 9 ; 10 11 12]`; `y=cat(1,A1,A2)` => `y=[1 2 3 ; 4 5 6 ;7 8 9; 10 11 12]` .

If `dims=2`, then the concatenation is done according to the columns of the input arguments

`A1=[1 2 3;4 5 6]`; `A2=[7 8 9 ;10 11 12]`; `y=cat(2,A1,A2)` => `y=[1 2 3 7 8 9 ; 4 5 6 10 11 12]` .

## Examples

    // first example : concatenation according to the rows
    dims=1; A1=[1 2 3]; A2=[4 5 6 ; 7 8 9]; A3=[10 11 12]; y=cat(dims,A1,A2,A3)

    // second example :  concatenation according to the columns
    dims=2; A1=[1 2 3]'; A2=[4 5;7 8;9 10]; y=cat(dims,A1,A2)

    // third example : concatenation according to the 3th dimension
    dims=3; A1=matrix(1:12,[2,2,3]); A2=[13 14;15 16]; A3=matrix(21:36,[2,2,4]); y=cat(dims,A1,A2,A3)

## See Also

- permute
- matrix