cancel
Showing results for
Did you mean:

## Understanding this line from vanilla tick set up  New Contributor III

I'm wondering what this part of the line, it is a conditional does: not min(`time`sym~2#key flip value@)each t

In particular why there is an @ Appy here?

2 ACCEPTED SOLUTIONS New Contributor III

It's creating a unary projection / composition for the part in brackets, could achieve the same with a lamda function:

``````q)(`time`sym~2#key flip value@)
~[`time`sym]#!+@[.:]
q)(`time`sym~2#key flip value@) each t
110b
q){`time`sym~2#key flip value x} each t
110b``````

* there is an overhead with using lambdas so in tick it's preferred to be as efficient as possible  Valued Contributor

Where `u`, `v`, `w`, etc. are unaries then `u v w@` is a unary composition equivalent to `{u v w x}`.

In this case two of the five unaries are projections. A little spacing clarifies:

``(`time`sym~ 2# key flip value@) each t``

2 REPLIES 2 New Contributor III

It's creating a unary projection / composition for the part in brackets, could achieve the same with a lamda function:

``````q)(`time`sym~2#key flip value@)
~[`time`sym]#!+@[.:]
q)(`time`sym~2#key flip value@) each t
110b
q){`time`sym~2#key flip value x} each t
110b``````

* there is an overhead with using lambdas so in tick it's preferred to be as efficient as possible  Valued Contributor

Where `u`, `v`, `w`, etc. are unaries then `u v w@` is a unary composition equivalent to `{u v w x}`.

In this case two of the five unaries are projections. A little spacing clarifies:

``(`time`sym~ 2# key flip value@) each t`` 