# Part

Name:
`Part - returns a sub-array of an array`
Synopsis:
```array1 array2 Part -> array3
```
Examples:
```         [ [3 5 6 9] [11 4 7 2] [-9 1 8 10] ]  [ [1 3] [2 3] ] Part  --> [[5 6] [1 8]]    [ [3 [-12 -19] 6 9] [11 4 7 2] [-9 1 8 10] ]  [ 1 2 2] Part --> -19    [3 4 5 6 7] [-2] Part	 --> 6    [3 [-9 -12] 5 6 7] [2] Part	 --> [-9 -12]    [3 [-9 -12] 5 6 7] [2 2] Part	 --> -12    [3 [-9 -12] 5 6 7] [[2 3]] Part	 --> [[-9 -12] 5]    [3 [-9 -12] 5 6 7] [[2 3 2]] Part	 --> [[-9 -12] 5 [-9 -12]]    [ [3 5 6 9] [11 4 7 2] [-9 1 8 10] ]  [ 1 []  ] Part   --> []    [ [3 5 6 9] [11 4 7 2] [-9 1 8 10] ]  [ [] 1 ] Part	 --> []    [3 [5 -12] 6 9]  [ [ 2 ] ] Part	 --> [[5 -12]]    [3 [5 -12] 6 9]  [ [ 2 ] 2] Part	 --> [-12]    [ [3 5 6 9] [11 4 7 2] [-9 1 8 10] ]  [ /All [3 2]  ] Part --> [[6 5] [7 4] [8 1]]
```
Description:
```   Part returns a sub-array of array1 specified by    array2. This function is an implementation of    Mathematica's Part function. It can also be used    to rearrange or copy parts of array1. Note,    Mathematica-style functions in SLI use Mathematica    index notation.
```
Parameters:
```   array1 is an arbitrarily shaped array. In particular    it does not need to be rectangular.       array2 is an array [i,j, ...] where the i,j specify the    selected elements on each level. Any i,j can itself be    an array [i1,i2,....] specifying a list of elements on    that level. When i is the literal /All, all elements on    the corresponding level are returned. The first element    on each level has index 1. Indices can also be specified    counting from the end of the array, in this case the last    element has index -1. Positive and neative indices can    arbitrarily be intermixed.       Alternatives: Function Part_a (undocumented) -> behaviour and    synopsis are the same.
```
Bugs:
```
```
Remarks:
```   Literal /All plays the role of the index specifier ':'    in Matlab when used without arguments. Note, that    Matlab in addition provides specifier 'end'.    This is not necessary in the formalism of Mathematica    because indices counting from the end of the array can be    expressed by negative values.
```
References:
```   [1] The Mathematica Book V4.0 "Part"
```
Author:
```Diesmann
```
FirstVersion:
```29.9.1999
```
SeeAlso: Source:
`/home/nest/work/nest-2.14.0/lib/sli/mathematica.sli`