[personal kdb+] Using apply (.) with a binary verb

[felix1]

> can somebody explain to me why I need parentheses around the binary verb %> when I am using it with apply.......> And then why do I have to use parentheses for "or over" in q while in k I> dont need themthe q parser is separate from the k4 one and it is dumber. it doesn'tunderstand multivalence (% is both a monadic and dyadic function).

[Attila]

%.(6 3)

or

%. 6 3

in q

is

reciprocal value 6 3

which does not make much sense

.6 3 is a float vector

.(6 3) is the verb . and an int vector

you need parentheses around % to make it a noun from a verb

Cheers,

  Attila

[sieber]

Hi,

thank you, I think I got it now.

% in k is both a verb "6%3" and a noun "%3".  In Q these built-in verbs are always used as verbs and never as noun, so "%3" in q gives an error. With the

parentheses I tell the q-interpreter, that I want to use % as noun.  Correct?

So Q can't differentiate between the verb and noun form of the built-in while K can. Correct?

Same goes for | in k which can be used as verb and noun. The or is | and in order to use it as a noun in q I need parentheses and the over adverb in Q needs a noun not a verb. Correct?

thank you!

Markus