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Component files
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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