(-) minus operator

(- date) -> number, const

Converts the date to a number and then invert its sign.

x = date(2020, 10, 1)
show scalar "" with -x

This operator is primarily intended for specifying the increasing or decreasing order when sorting against date value.

(- number) -> number, const autodiff

The sign inversion of a number.

x = 3
show scalar "" with -x

(- ranvar) -> ranvar

The reflected random random variable, i.e. $P[x = -X]$.

x = poisson(3)
show scalar "" with -x

(- zedfunc) -> zedfunc

The inverted function, i.e. $f(-x)$.

x = linear(3)
show scalar "" with -x

(number - number) -> number, const autodiff

The regular substraction of two numbers.

x = 3
y = 2
show scalar "" with x - y

(date - date) -> number, const

The substraction of two dates returns the number of days of difference.

x = date(2020, 11, 25)
y = date(2019,  8, 24)
show scalar "days" with x - y

There is no + counterpart for a pair of date values.

(date - number) -> date, const

Substracts an integral number of days to a date.

x = date(2020,8,25) + 12
show scalar "" with x

(ranvar - ranvar) -> ranvar

The substraction of two random independent variables over $\mathbb{Z}$.

x1 = poisson(5)
x2 = poisson(3)
show scalar "" with x1 - x2

Under the hood, a convolution happens. The mean of the resulting ranvar is equal to the difference of the means of the two ranvar operands.

(zedfunc - zedfunc) -> zedfunc

The substraction of two zedfuncs, real functions over $\mathbb{Z}$..

f = linear(3)
g = linear(2)
show scalar "" with f - g

(embedding - embedding) -> embedding

Combines two embeddings into a new embedding.

a = embedding("demand")
b = embedding("forecast")
c = a - b
show scalar "Embedding diff" with spark(c)