Bug? rand with find

Community Support
1

Rand with find(?) sometimes returns strange number.
Is this a bug?

KDB+ 3.3 2015.07.09 Copyright (C) 1993-2015 Kx Systems
l32/ 4()core

q)10?rand 10
2 1 2 1 2 3 2 5 4 7
…
q)10?rand 10
6299546977983373652 2157301088332608031 -7209837269872637184 -453213953909620..

2

It’s what you get when you use ? with 0 on the RHS

q)10?0

-6739119069145492435 4254529079255828354 8099614742952382528 -7528108271820962578 717681689843314..

Not sure if it’s documented anywhere but it’s always had this behaviour.

3

? also behaves as rand.    http://code.kx.com/wiki/Reference/QuestionSymbol#rand

According to wiki: http://code.kx.com/wiki/Reference/rand

 r:rand X

If X is an atom 0, it returns a random value of the same type in the range of that type.

If X is a positive number, it returns a random number of the same type in the range [0,X)

4

Thank you, Tom, RAHUL.
I understand. In this case, rand is unnecessary, 10?10 is enough.