% Divide¶
x%y %[x;y]Returns the
ratio of the underlying values of x and y as a float.
Note that this is different from some other programming languages, e.g. C++.
q)2%3
0.6666667
q)halve:%[;2] /projection
q)halve til 5
0 0.5 1 1.5 2
q)"z"%"a"
1.257732
q)1b%0b
0w
q)00:00:10.000000000 % 00:00:05.000000000 /ratio of timespans
2fDates are represented internally as days after 2000.01.01, so the ratio of two dates is the ratio of their respective number of days since 2000.01.01.
q)"i"$2010.01.01 2005.01.01 /days since 2000.01.01
3653 1827i
q)(%/)"i"$2010.01.01 2005.01.01
1.999453
q)2010.01.01 % 2005.01.01
1.999453% is a multithreaded primitive.
Implicit iteration¶
Divide is an atomic function.
q)(10;20 30)%(2;3 4)
5f
6.666667 7.5It applies to dictionaries and tables.
q)k:`k xkey update k:`abc`def`ghi from t:flip d:`a`b!(10 -21 3;4 5 -6)
q)d%2
a| 5 -10.5 1.5
b| 2 2.5 -3
q)d%`b`c!(10 20 30;1000*1 2 3) /upsert semantics
a| 10 -21 3
b| 0.4 0.25 -0.2
c| 1000 2000 3000
q)t%100
a b
-----------
0.1 0.04
-0.21 0.05
0.03 -0.06
q)k%k
k | a b
---| ---
abc| 1 1
def| 1 1
ghi| 1 1Range and domains¶
b g x h i j e f c s p m d z n u v t
----------------------------------------
b | f . f f f f f f f . f f f f f f f f
g | . . . . . . . . . . . . . . . . . .
x | f . f f f f f f f . f f f f f f f f
h | f . f f f f f f f . f f f f f f f f
i | f . f f f f f f f . f f f f f f f f
j | f . f f f f f f f . f f f f f f f f
e | f . f f f f f f f . f f f f f f f f
f | f . f f f f f f f . f f f f f f f f
c | f . f f f f f f f . f f f f f f f f
s | . . . . . . . . . . . . . . . . . .
p | f . f f f f f f f . f f f f f f f f
m | f . f f f f f f f . f f f f f f f f
d | f . f f f f f f f . f f f f f f f f
z | f . f f f f f f f . f f f f f f f f
n | f . f f f f f f f . f f f f f f f f
u | f . f f f f f f f . f f f f f f f f
v | f . f f f f f f f . f f f f f f f f
t | f . f f f f f f f . f f f f f f f fRange: f
div,
Multiply,
ratios
Mathematics
Q for Mortals
ยง4.4 Basic Arithmetic