Selecting fields into a data frame

 

select	Select fields to a frame
<data>	name of the data frame
-f <field-list>	fields to be selected

This operation connects fields into a data frame, which will be created, if it does not exist. The command can also be used to add more fields to an existing frame as the example below shows.

select	Select all fields from a data frame into a target frame
<data>	name of the target data frame
-d <src-name>	source data frame

This operation connects all the fields from a given frame to a target frame.

Example: Names in the name space are listed with ls and then two fields get selected to the new frame data2. Thereafter, an additional field is added to data2.

NDA> load boston.dat
NDA> ls -u -fr
 d    boston
 f    boston.crim
 f    boston.zn
 f    boston.indus
 f    boston.chas
...
NDA> select data2 -f boston.crim boston.zn
# Select more fields
NDA> select data2 -f boston.indus
NDA> ls -fr data2
 data2.crim
 data2.zn
 data2.indus
# Select all fields from a given data
NDA> select data3 -d boston