Functions withdrawn from q

The functions listed here have been withdrawn from q, and are listed here solely for the interpretation of old scripts.

list

The list function created a list from its arguments. Use enlist instead.

q)list[1;`a`b;"abcd"]
(1;`a`b;"abcd")

plist

The plist function was a form of enlist (which creates a list from its arguments). It was removed completely in V3.0.

q)plist[1;`a`b;"abcd"]
(1;`a`b;"abcd")

txf

Syntax: txf[table;indices;columns]

The txf function did indexed lookup on a keyed table. The function was deprecated since V2.4, and removed completely in V3.0, in favor of straightforward indexing as shown below.

Here, table is a keyed table. The indices are the key values to lookup. The columns are those to be read.

q)s:`a`s`d`f
q)c:2 3 5 7
q)p:1 2 3 4
q)r:10 20 30 40
q)t:([s;c];p;r)
q)txf[t;(s;c);`p`r]
1 10
2 20
3 30
4 40
q)t[([]s;c);`p`r]             / equivalent without txf
1 10
2 20
3 30
4 40
q)
q)txf[t;(`d`a;5 2);`p`r]
3 30
1 10
q)t[([]s:`d`a;c:5 2);`p`r]    / equivalent without txf
3 30
1 10

txf was used in select-expressions to join tables with no foreign key relationship.

q)q:([]s:`d`f`s;c:5 7 3;k:"DFS")
q)select s,k,txf[t;(s;c);`p] from q
s k x
-----
d D 3
f F 4
s S 2
q)select s,k,t[([]s;c);`p] from q    / equivalent without txf
s k x
-----
d D 3
f F 4
s S 2