hdl.treeprod

Product of array elements using tree architecture

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Syntax

B = hdl.treeprod(A)

B = hdl.treeprod(A, 'all')

B = hdl.treeprod(A, dim)

Description

example

B = hdl.treeprod(A) returns the product of the elements of A.

If A is a vector, then hdl.treeprod(A) returns the product of the elements.
If A is a matrix, then hdl.treeprod(A) returns a row vector containing the products of each column.

The function hdl.treeprod uses a tree architecture to multiply elements. The tree architecture multiplication yields a shorter critical path, which leads to reduced latency when generating HDL code from a MATLAB Function block. When generating HDL code, the function hdl.treeprod reduces the amount of matching delays required to multiply elements.

example

B = hdl.treeprod(A, 'all') computes the product of all elements of A.

example

B = hdl.treeprod(A, dim) returns the product along dimension dim. For example, if A is a matrix, hdl.treeprod(A,2) is a column vector containing the products of each row.

Examples

Product of Vector Elements

Create a vector and compute the product of its elements.

A = 1:5;
B = hdl.treeprod(A)

B =
     120

Product of Matrix Elements

Create a matrix and compute the product of its elements.

A = [1 3 2; 4 2 5; 6 1 4]

A = 3×3

     1     3     2
     4     2     5
     6     1     4

B = hdl.treeprod(A,'all')

B =
     5760

Product of Matrix Columns

Create a matrix and compute the product of the elements in each column.

A = [1 3 2; 4 2 5; 6 1 4]

A = 3×3

     1     3     2
     4     2     5
     6     1     4

B = hdl.treeprod(A)

B = 1×3

    24     6    40

Product of Matrix Rows

Create a matrix and compute the product of the elements in each row.

A = [1 3 2; 4 2 5; 6 1 4]

A = 3×3

     1     3     2
     4     2     5
     6     1     4

B = hdl.treeprod(A,2)

Input Arguments

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`A` — Input array
scalar | vector | matrix

Input array, specified as a scalar, vector, or 2-D matrix.

`dim` — Dimension to operate along
positive integer scalar

Dimension to operate along, specified as a positive integer scalar. If no value is specified, then the default is the first array dimension whose size does not equal 1.

Dimension dim indicates the dimension whose length reduces to 1. The size(S,dim) is 1, while the sizes of the other dimensions remain the same.

Consider a two-dimensional input array, A:

sum(A,1) operates on successive elements in the columns of A and returns a row vector of the sums of each column.
sum(A,2) operates on successive elements in the rows of A and returns a column vector of the sums of each row.