create an iterator for a specified structure - Maple Help

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combstruct[iterstructs] - create an iterator for a specified structure

combstruct[nextstruct] - produce the next structure

combstruct[finished] - return true when the last structure is produced

Calling Sequence

iterstructs(struct(args), size=n)

nextstruct(it)

finished(it)

Parameters

struct

-

one of a predefined list of available structures

args

-

argument list that corresponds to the structure struct

n

-

(optional) non-negative integer specifying the size of the object or the string 'allsizes' when the object should be selected from all possible sizes

it

-

iterator returned by a call to iterstructs

Description

• 

The iterstructs function returns an iterator in the form of a table. The nextstruct and finished functions are used to manipulate this table. The table entry nextvalue is a procedure created to traverse the elements defined by struct(args) of size n. The finished entry is a flag that is set to true when the last structure is produced.

• 

The nextstruct command returns the next structure from the iterator defined by the call to iterstructs.

• 

The finished function returns true when the last structure is produced.

• 

If the size is not specified, the default size for that structure is used.

• 

To list all the structures at once, see combstruct[allstructs].

  

For a list of available structures, see combstruct[structures].

Examples

withcombstruct:

allp:=iterstructsPermutationa,b,c:

whilenotfinishedallpdonextstructallpend do

a,b,c

b,a,c

c,a,b

a,c,b

b,c,a

c,b,a

(1)

See Also

combstruct, combstruct[allstructs], combstruct[structures]


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