Reference/raze

raze (raze function)

The raze function joins items of its argument, and collapses one level of nesting. To collapse all levels, use over i.e. raze/[x].

An atom argument is returned as a one-element list.

Example

q)raze (1 2;3 4 5)
1 2 3 4 5
q)b:(1 2;(3 4;5 6);7;8)
q)raze b                 / flatten one level
1
2
3 4
5 6
7
8
q)raze/[b]               / flatten all levels
1 2 3 4 5 6 7 8

Acts on a dictionary to return the flattened values:

q)d:`q`w`e!(1 2;3 4;5 6)
q)value d
1 2
3 4
5 6
q)raze d
1 2 3 4 5 6

Remark

raze is defined in k as ,/ and requires that items can be joined together. For example:

q)d:`a`b!(1 2;3 5)
q)10,d          / cannot join integer and dictionary
'type
q)raze (10;d)   / raze will not work
'type

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For a complete list of functions, see the kdb+ Function Reference.