How to Extract Specific Elements from an Array

How do I extract specific elements from an array?

Here's one way:

[0,4,6].map{|i| a[i]}

How can I extract elements of an array inside an array to this array?

You should assign the result of map() directly to res, rather than calling push() inside the map.

You can use Object.fromEntries() to create the object from the inner map.

Destructuring and spread syntax can simplify the way you access the properties and build the resulting object.

const tableData = [{
    display: '2022-03',
    column: 'data',
    detailList: [{
        title: 'Quantity',
        value: 1,
        sourceId: null,
      },
      {
        title: 'Price',
        value: 2,
        sourceId: null,
      },
      {
        title: 'Weight',
        value: 3,
        sourceId: null,
      },
      {
        title: 'income',
        value: 4,
        sourceId: null,
      },

    ],
  },
  {
    display: '2022-02',
    column: 'data',
    detailList: [{
        title: 'Quantity',
        value: 7,
        sourceId: null,
      },
      {
        title: 'Price',
        value: 6,
        sourceId: null,
      },
      {
        title: 'Weight',
        value: 5,
        sourceId: null,
      },
      {
        title: 'income',
        value: 4,
        sourceId: null,
      },

    ],
  },
];

let res = tableData.map(({
  display,
  detailList
}) => ({
  title: display,
  ...Object.fromEntries(detailList.map(({
    title,
    value
  }) => [title, value === null ? '-' : value]))
}));

console.log(res);

How to extract a single value from an array

Test it,
You must parse JSON string before using it!

var data = JSON.parse('[{"price":"120.00"}]');
var Price = data[0].price; // 120.00
//OR IF it's Single And not Array
var Price = data.price; // 120.00

Extract specific elements from a multidimensional array

You can try

let p:[[Double]] = [[3,2],[4,1]]
let t:[[Int]] = [[0,0],[1,0]]
let res = t.map { p[$0.first!][$0.last!] }  
print(res)

How to extract specific part of a numpy array?

You can find the index of the nearest value by creating a new array of the differences between the values in the original array and the target, then find the index of the minimum value in the new array.

For example, starting with an array of random values in the range 5.0 - 10.0:

import numpy as np

x = np.random.uniform(low=5.0, high=10.0, size=(20,))
print(x)

Find the index of the value closest to 8 using:

target = 8

diff_array = np.absolute(x - target)
print(diff_array)

index = diff_array.argmin()
print(index, x[index])

Output:

[7.74605146 8.31130556 7.39744138 7.98543982 7.63140243 8.0526093
 7.36218916 6.62080638 6.18071939 6.54172198 5.76584536 8.69961399
 5.83097522 9.93261906 8.21888006 7.63466418 6.9092988  9.2193369
 5.41356164 5.93828971]

[0.25394854 0.31130556 0.60255862 0.01456018 0.36859757 0.0526093
 0.63781084 1.37919362 1.81928061 1.45827802 2.23415464 0.69961399
 2.16902478 1.93261906 0.21888006 0.36533582 1.0907012  1.2193369
 2.58643836 2.06171029]

3 7.985439815743841

Extract specific elements from array to create ranges

You can create your two ranges, then stack them on the column axis:

np.stack((np.arange(0, 500, 75), np.arange(50, 550, 75)), axis=1)

Generalized:

>>> start = 50
>>> step = 75
>>> end = 550
>>> np.stack((np.arange(0, end - start, step), np.arange(start, end, step)), axis=1)
array([[  0,  50],
       [ 75, 125],
       [150, 200],
       [225, 275],
       [300, 350],
       [375, 425],
       [450, 500]])

How can I extract from an array of arrays all the arrays that have the same value in their first field?

const findDuplicates = (dataArray) => {
  const duplicates = dataArray.filter((e, index, arr) => {
    return arr.some((val, i) => (index !== i && val[0] === e[0]))
  })
  return (duplicates);
};

const result = findDuplicates([
  ['123456', 'Smith'],
  ['787877', 'Jones'],
  ['763223', 'Waldo'],
  ['787877', 'Quagmire'],
  ['854544', 'Miller']
])

console.log(result)

How to extract a specific element value from an array in laravel controller

This should work

$IncomeTo = $fetchSubFormDetailData['IncomeTo'];

python extract elements from array

Based on your example, a simple workaround would be this:

train = [X[i] for i, _ in enumerate(X) if i not in idx]

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