Component files
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A component file jfile can be thought of as a boxed list stored in a file. An item of the boxed list on file is referred to as a component. The script jfiles.ijs provides the utilities for working with jfiles.
load 'jfiles' f =. 'user\data.jf' jcreate f 1 'first component' jappend f 0 (1.5+i.2 3) jappend f 1 ('asdf';23) jappend f 2 3 (<'mum';'dad') jappend f 4
The jsize result gives file information, including the indexes of the first and last items.
jsize f 0 5 1408 0 jread f;0 +---------------+ |first component| +---------------+ jread f;1 +-----------+ |1.5 2.5 3.5| |4.5 5.5 6.5| +-----------+ jread f;2 +----+ |asdf| +----+ jread f;3 +--+ |23| +--+ jread f;4 +---------+ |+---+---+| ||mum|dad|| |+---+---+| +---------+ 'new' jreplace f;3 3 jread f;i.5 +---------------+-----------+----+---+---------+ |first component|1.5 2.5 3.5|asdf|new|+---+---+| | |4.5 5.5 6.5| | ||mum|dad|| | | | | |+---+---+| +---------------+-----------+----+---+---------+
jfiles are documented in the J Online Documentation.
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