(*) multiply operator and star operator
(number * number) 🡒 number, const autodiff
The regular multiplication of two numbers.
x = 3
y = 2
show scalar "" with x * y
(ranvar * ranvar) 🡒 ranvar
The multiplication of two random independent variables over $\mathbb{Z}$.
x1 = poisson(5)
x2 = poisson(3)
show scalar "" a1b2 with x1 * x2
This operation is also known as the Dirichlet convolution. Under the hood, a convolution happens. The mean of the resulting ranvar is equal to the product of the means of the two ranvar operands.
(zedfunc * zedfunc) 🡒 zedfunc
The multiplication of two zedfuncs, real functions over $\mathbb{Z}$..
Example:
f = linear(3)
g = linear(2)
show scalar "" a1b2 with f * g
(text * number) 🡒 text
Repeats text a specified number of times. "ABC" * 3 is "ABCABCABC". An integer is expected.
Example:
show scalar "" a1c1 with "ABC" * 3
Table.* 🡒 boolean, star operator
The MyTable.* syntax is used as a syntactic sugar for true into MyTable.
table T = with
[| as A |]
[| true |]
[| false |]
[| true |]
where T.A
show scalar "Lines" a1 with count(T.*) // '2'
// 'T.*' is a syntactic sugar for 'true into T'
show scalar "Lines" a2 with count(true into T) // '2'
The T.* syntactic sugar can be used in isolation, but this sugar is really intended for count(T.*), which is reminiscent of the SQL syntax SELECT COUNT(*) FROM myTbl.