{"id":4350,"date":"2022-08-10T01:44:53","date_gmt":"2022-08-10T01:44:53","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=4350"},"modified":"2022-08-10T04:11:32","modified_gmt":"2022-08-10T04:11:32","slug":"numpy-amin","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/python-numpy\/numpy-amin\/","title":{"rendered":"NumPy amin()"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you will learn how to use the numpy amin()<\/code> function to find the minimum element in an array.<\/p>\n\n\n\n

Introduction to the NumPy amin() function #<\/a><\/h2>\n\n\n\n

The amin()<\/code><\/code> function returns the minimum element of an array or minimum element along an axis. Here’s the syntax of the amin()<\/code><\/code> function:<\/p>\n\n\n

numpy.amin(a, axis=None<\/span>, out=None<\/span>, keepdims=<no value>, initial=<no value>, where=<no value>)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
The amin()<\/code><\/code> function is equivalent to the min()<\/code> method of the ndarray<\/code> object:<\/p>\n\n\n
ndarray.min(axis=None<\/span>, out=None<\/span>, keepdims=False<\/span>, initial=<no value>, where=True<\/span>)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
NumPy amin() function examples #<\/a><\/h2>\n\n\n\n
Let’s take some examples of using the amin()<\/code> function.<\/p>\n\n\n\n
1) Using numpy amin() function on 1-D array example #<\/a><\/h3>\n\n\n\n
The following example uses the numpy amin()<\/code> function to find the minimum value in a 1-D array:<\/p>\n\n\n
import<\/span> numpy as<\/span> np\n\n\na = np.array([1<\/span>, 2<\/span>, 3<\/span>])\nmin = np.amin(a)\nprint(min)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
1<\/span><\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
How it works.<\/p>\n\n\n\n
a = np.array([1<\/span>, 2<\/span>, 3<\/span>])<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Second, find the minimum number using the amin()<\/code> function:<\/p>\n\n\n
min = np.amin(a)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Third, display the result:<\/p>\n\n\n
print(min)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
2) Using numpy amin() function on multidimensional array examples #<\/a><\/h3>\n\n\n\n
The following example uses the amin()<\/code> funciton to find the minimum number in a 2-D array:<\/p>\n\n\n
import<\/span> numpy as<\/span> np\n\na = np.array([\n    [1<\/span>, 2<\/span>],\n    [3<\/span>, 4<\/span>]]\n)\nmin = np.amin(a)\nprint(min)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
1<\/span><\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
If you want to find the minimum value on each axis, you can use the axis argument. For example, the following uses the amin()<\/code> function to find the minimum value on axis 0:<\/p>\n\n\n
import<\/span> numpy as<\/span> np\n\na = np.array([\n    [1<\/span>, 2<\/span>],\n    [3<\/span>, 4<\/span>]]\n)\nmin = np.amin(a, axis=0<\/span>)\nprint(min)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
\"\"<\/figure>\n\n\n\n
Output:<\/p>\n\n\n
[1<\/span> 2<\/span>]<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Similarly, you can use the amin()<\/code> function to find the minimum value on axis 1:<\/p>\n\n\n
import<\/span> numpy as<\/span> np\n\na = np.array([\n    [1<\/span>, 2<\/span>],\n    [3<\/span>, 4<\/span>]]\n)\nmin = np.amin(a, axis=1<\/span>)\nprint(min)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
\"\"<\/figure>\n\n\n\n
Output:<\/p>\n\n\n
[1<\/span> 3<\/span>]<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Summary #<\/a><\/h2>\n\n\n\n
  • Use the numpy amin()<\/code> function to find the minimum element in an array or minimum element along an axis.<\/li><\/ul>\n
    \n\t
    \n\t\t
    Was this tutorial helpful ?<\/div>\n\t\t
    \n\t\t\t\n\t\t\t\t\n\t\t\t\t\t<\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t Yes <\/span>\n\t\t\t<\/button>\n\n\t\t\t\n\t\t\t\t\n\t\t\t\t\t<\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t No <\/span>\n\t\t\t<\/button>\n\t\t<\/div>\n\t<\/header>\n\n\t
    \n\t\t
    \n\t\t\t
    <\/div>\n\t\t\t
First, create a new array<\/a> that has three numbers 1, 2, and 3:<\/p>\n\n\n