# Function index

Create an index. An Index can store ranges having start, step, and end for multiple dimensions. Matrix.get, Matrix.set, and math.subset accept an Index as input.

Usage:     var index = math.index(range1, range2, ...);

Where each range can be any of:     An array [start, end]     An array [start, end, step]     A number     null, this will create select the whole dimension

The parameters start, end, and step must be integer numbers.


### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`ranges` | ...* | 

### Returns

Type | Description
---- | -----------
 | undefined




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