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ndarray-concat-cols

Concatenate ndarrays by column (along the last dimension)

Introduction

This module takes a list of input ndarrays and concatenates it along the last dimension. That is, a 3 × 2 ndarray concatenated with a 3 × 5 ndarray yields a 3 × 7 ndarray.

Examples

Understanding [+] in the comments below to indicate column concatenation,

var ndarray = require('ndarray')
var c = require('ndarray-concat-cols')

// Concatenating vectors:
//   [1]     [4]   [1 4]
//   [2] [+] [5] = [2 5]
//   [3]     [6]   [3 6]
c([ ndarray([1, 2, 3]), ndarray([4, 5, 6]) ])
// => ndarray([1, 4, 2, 5, 3, 6], [3, 2])

// Concatenating matrices:
//   [1 2]     [7]    [1 2 7]
//   [3 4] [+] [8] -> [3 4 8]
//   [5 6]     [9]    [5 6 9]
//
c([ ndarray([1, 2, 3, 4, 5, 6], [3, 2]), ndarray([7, 9, 9], [3, 1]) ])
// => ndarray([1, 2, 7, 3, 4, 8, 5, 6, 9], [3, 3])

Installation

$ npm install ndarray-concat-cols

API

`require('ndarray-concat-cols')([output,] input, [options])`

Arguments:

output (optional): An optional output destination. The shape must match the shape of the concatenated arrays, otherwise an error will be thrown. If not provided, storage will be allocated using ndarray-scratch.
input: A javascript Array containing ndarrays to be concatenated. If this is missing or empty, an error will be thrown. Given n-dimensional input, all arguments must have the same dimensionality and the first n-1 dimensions of each arguments must have the same length.
options (optional): An optional object containing options. Options are:
- dtype: If no output ndarray is provided, the dtype of the output will be double (equivalently float64) by default, or otherwise the dtype specified here. See ndarray dtypes.

Returns: A reference to the output ndarray containing the concatenated data.