series_dot_product_fl()

Calculates the dot product of two numerical vectors.

The function series_dot_product_fl() is a user-defined function (UDF) that takes an expression containing two dynamic numerical arrays as input and calculates their dot product.

Syntax

series_dot_product_fl(vec1, vec2)

Parameters

Function definition

You can define the function by either embedding its code as a query-defined function, or creating it as a stored function in your database, as follows:

Query-defined

Define the function using the following let statement. No permissions are required.

let series_dot_product_fl=(vec1:dynamic, vec2:dynamic)
{
    let elem_prod = series_multiply(vec1, vec2);
    let cum_sum = series_iir(elem_prod, dynamic([1]), dynamic([1,-1]));
    todouble(cum_sum[-1])
};
// Write your query to use the function here.

Stored

Define the stored function once using the following .create function. Database User permissions are required.

.create-or-alter function with (folder = "Packages\\Series", docstring = "Calculate the dot product of 2 numerical arrays")
series_dot_product_fl(vec1:dynamic, vec2:dynamic)
{
    let elem_prod = series_multiply(vec1, vec2);
    let cum_sum = series_iir(elem_prod, dynamic([1]), dynamic([1,-1]));
    todouble(cum_sum[-1])
}

Example

Query-defined

To use a query-defined function, invoke it after the embedded function definition.

let series_dot_product_fl=(vec1:dynamic, vec2:dynamic)
{
    let elem_prod = series_multiply(vec1, vec2);
    let cum_sum = series_iir(elem_prod, dynamic([1]), dynamic([1,-1]));
    todouble(cum_sum[-1])
};
union
(print 1 | project v1=range(1, 3, 1), v2=range(4, 6, 1)),
(print 1 | project v1=range(11, 13, 1), v2=range(14, 16, 1))
| extend v3=series_dot_product_fl(v1, v2)

Stored

union
(print 1 | project v1=range(1, 3, 1), v2=range(4, 6, 1)),
(print 1 | project v1=range(11, 13, 1), v2=range(14, 16, 1))
| extend v3=series_dot_product_fl(v1, v2)

Output