Function apply #
Apply a function that maps an array to a scalar along a given axis of a matrix or array. Returns a new matrix or array with one less dimension than the input.
Syntax #
math.apply(A, dim, callback)
Where #
dim: numberis a zero-based dimension over which to concatenate the matrices.
Parameters #
| Parameter | Type | Description |
|---|---|---|
array |
Array | Matrix | The input Matrix |
dim |
number | The dimension along which the callback is applied |
callback |
Function | The callback function that is applied. This Function should take an array or 1-d matrix as an input and return a number. |
Returns #
| Type | Description |
|---|---|
| Array | Matrix | res The residual matrix with the function applied over some dimension. |
Throws #
Type | Description —- | ———–
Examples #
const A = [[1, 2], [3, 4]]
const sum = math.sum
math.apply(A, 0, sum) // returns [4, 6]
math.apply(A, 1, sum) // returns [3, 7]
