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# .., _range

Range operator

### Use only in the MuPAD Notebook Interface.

This functionality does not run in MATLAB.

## Syntax

```l .. r
_range(l, r)
```

## Description

l..r defines a "range" with the left bound l and the right bound r.

A range is a technical construct that is used to specify ranges of numbers when calling various system functions such as int, array, op, or the sequence operator \$. Usually, l..r represents a real interval (e.g., int(f(x), x = l..r)), or the sequence of integers from l to r.

_range(l, r) is equivalent to l..r.

To create and operate on intervals in a mathematical sense, use the data type Dom::Interval.

## Examples

### Example 1

A range can be defined with the .. operator as well as with a call to the function _range:

`_range(1, 42), 1..42`

In the following call, the range represents an interval:

`int(x, x = l..r)`

Ranges can be used for accessing the operands of expressions or to define the size of arrays and hfarrays:

`op(f(a, b, c, d, e), 2..4)`

`array(1..3, [a1, a2,a3])`

`hfarray(1..3, 1..2)`

Ranges can also be used for creating expression sequences:

`i^3 \$ i = 1..5`

### Example 2

The range operator .. is a technical device that does not check its parameters with respect to their semantics. It just creates a range which is interpreted in the context in which it is used later. Any bounds are accepted:

`float(PI) .. -sqrt(2)/3`

## Return Values

Expression of type "_range".