# Documentation

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Abstract data type “Queue”

MATLAB live scripts support most MuPAD functionality, though there are some differences. For more information, see Convert MuPAD Notebooks to MATLAB Live Scripts.

## Description

adt::Queue implements the abstract data type “Queue”. To create a queue, an expression sequence of any MuPAD® objects can be given to initialize the queue, otherwise an empty queue is built.

### Note

The methods of all abstract data types must be called especially and will result changing the object itself as side effect.

With Q := adt::Queue() an empty queue is built and assigned to the variable Q.

Every queue will be displayed as Queue followed by a number. This name is generated by genident.

### Note

All following methods changes the value of Q itself. A new assignment to the variable (in this example Q) is not necessary, in contrast to all other MuPAD functions and data types.

The methods clear, dequeue, empty, enqueue, front, length, reverse are available for handling with queues.

## Examples

### Example 1

Create a new queue with strings as arguments.

Q := adt::Queue("1", "2", "3", "4")

Show the length of the queue.

Q::length()

Fill up the queue with a new element. The queue will be changed by the method, no new assignment to Q is necessary!

Q::enqueue("5")

Show the front of the queue. This method does not change the queue.

Q::front(), Q::front()

After twice getting an element of the queue, the third element is the new front of the queue, and the length is 3.

Q::dequeue(), Q::dequeue(), Q::front(), Q::length()

Now revert the queue. The last element will be the first element.

Q::reverse(): Q::front()

Enlarge the queue with "2".

Q::enqueue("2"):
Q::empty()

Finally collect all elements of the queue in the list assigned to ARGS, until the queue is empty.

ARGS := []:
while not Q::empty() do ARGS := append(ARGS, Q::dequeue()) end:
ARGS

## Parameters

 queue An expression sequence of objects to initialize the queue

expand all

clear()

dequeue()

empty()

enqueue(x)

front()

length()

reverse()