Function mapSlices #
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.mapSlices(A, dim, callback)
Where #
dim: number is 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 mapped on the slices over some dimension. |
Throws #
Examples #
const A = [[1, 2], [3, 4]]
const sum = math.sum
math.mapSlices(A, 0, sum) // returns [4, 6]
math.mapSlices(A, 1, sum) // returns [3, 7]
See also #
map,
filter,
forEach
