Vocabulary/lt

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< y (Box)
1. Common uses
2. See Also
x < y (Less Than)
1. Common uses
2. See Also

< y (Box)

Converts any array y to Boxed form, ie suitable for use with an array of boxed forms, such as you get with using Link (;) or Words (;:).

Common uses

To add elements to a vector of boxed strings:

   ]zub=: ;:'alpha bravo charlie'
+-----+-----+-------+
|alpha|bravo|charlie|
+-----+-----+-------+
   zub,<'delta'
+-----+-----+-------+-----+
|alpha|bravo|charlie|delta|
+-----+-----+-------+-----+

To compare a string with contents of a vector of boxed strings:

   zub = <'bravo' 
0 1 0

Some primitives and Foreigns (!:), especially those designed to work on a boxed list of names, demand a boxed argument if only one name is given.

   xx=: yy=: zz=: 99
   4!:55 'zz'     NB. try to erase word: zz
|domain error
|       4!:55'zz'
   4!:55 <'zz'    NB. erase word: zz
1
   4!:55 'xx' ; 'yy'
1 1

The z-locale verb: erase, which invokes 4!:55, accepts either a boxed or an unboxed string.

The z-locale verb: boxopen boxes its argument, but only if unboxed:

   boxopen 'zz'
+--+
|zz|
+--+
   boxopen <'zz'
+--+
|zz|
+--+

x < y (Less Than)

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Returns Boolean (0 or 1) if and only if x<y is true.

   z=: 7 8 9
   z < 8
1 0 0

Common uses

Mainly found in the logical conditions of if. statements within verb definitions:

if. x<y do.  'x y'=. y;x  end.

< y (Box)

Common uses

See Also

x < y (Less Than)

Common uses

See Also