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# How to compute numerical negative value for all elements in a given NumPy array?

• Last Updated : 07 Aug, 2021

In this article, we will see how to compute the negative value for all elements in a given NumPy array. So, The negative value is actually the number which when added to any number becomes 0.

Example:

If we take a number as 4 then -4 is its negative number because when we add -4 to 4 we get sum as 0. Now let us take another example, Suppose we take a number -6 Now when we add +6 to it then the sum becomes zero. hence +6 is the negative value of -6. Now suppose we have an array of numbers:

```A = [1,2,3,-1,-2,-3,0]
So, the negative value of A is
A'=[-1,-2,-3,1,2,3,0].```

So, for finding the numerical negative value of an element we have to use numpy.negative() function of NumPy library.

Syntax: numpy.negative(arr, /, out=None, *, where=True, casting=’same_kind’, order=’K’, dtype=None, subok=True[, signature, extobj], ufunc ‘negative’)

Return: [ndarray or scalar] Returned array or scalar = -(input arr or scalar )

Now, let’s see the examples:

Example 1:

## Python3

 `# importing library``import` `numpy as np` `# creating a array``x ``=` `np.array([``-``1``, ``-``2``, ``-``3``,``              ``1``, ``2``, ``3``, ``0``])` `print``(``"Printing the Original array:"``,``      ``x)` `# converting array elements to``# its corresponding negative value``r1 ``=` `np.negative(x)` `print``(``"Printing the negative value of the given array:"``,``      ``r1)`

Output:

```Printing the Original array: [-1 -2 -3  1  2  3  0]
Printing the negative value of the given array: [ 1  2  3 -1 -2 -3  0]
```

Example 2:

## Python3

 `# importing library``import` `numpy as np` `# creating a numpy 2D array``x ``=` `np.array([[``1``, ``2``],``              ``[``2``, ``3``]])` `print``(``"Printing the Original array Content:\n"``,``      ``x)` `# converting array elements to``# its corresponding negative value``r1 ``=` `np.negative(x)` `print``(``"Printing the negative value of the given array:\n"``,``      ``r1)`

Output:

```Printing the Original array Content:
[[1 2]
[2 3]]
Printing the negative value of the given array:
[[-1 -2]
[-2 -3]]```

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