i()

Here are how to use i() functions.

A.i()

Description:

Convert a specified sequence to a pure sequence.

Syntax:

A.i()

Note:

The function converts sequence A to a pure sequence. A pure sequence is a sequence where members have same data type.

The conversion is impossible when members of the sequence do not have same data type. Error is reported when members are modified and a pure sequence becomes not pure. When the computation involves an ordinary sequence or when it is expected that the result of the computation is not a pure sequence, the specified sequence will be automatically converted to an ordinary one.

Parameter:

A	A sequence

Return value:

A pure sequence

Example:

	A
1	=["a","c","d","e","f"]
2	=A1.i()	Convert sequence A1 to a pure sequence
3	=[1,2,3,4,5,6,7,"a"]
4	=A3.i()	As members of A3’s sequence do not have same data type, error is reported when trying to convert it to a pure sequence
5	=A2(3)=8	Error is reported during execution of the expression because we change the 3d member in A2 to 8 and the originally pure sequence becomes not pure

P.i()

Description:

Convert a specified table sequence to apure table sequence.

Syntax:

P.i()

Note:

The function converts table sequence P to a pure record sequence or a pure table sequence that uses columnwise storage. A pure table sequence is a table sequence where all fields are made pure.

Error is reported when field values of a pure table sequence are modified.

Parameter:

P	A table sequence

Return value:

A pure record sequence or a pure table sequence

Example:

	A
1	=demo.query("select EID,NAME,GENDER,DEPT,BIRTHDAY from employee")	Return a table sequence whose all fields are pure fields
2	=A1.i()	Convert A1’s table sequene to a pure table sequence