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# How to obtain the range of values along an array's axis

Onyejiaku Theophilus Chidalu

### Overview

The ptp() function in NumPy obtains the range of values along a given array's axis.

Range = maximum value - minimum value

Axes in NumPy are defined for any given array having more than one dimension (e.g., a 2-D array). A 2-D array has two corresponding axes, axis 0 and axis 1. Axis 0 runs vertically downwards across rows while axis 1 runs horizontally across columns.

### Syntax

The syntax for the ptp() function is given below:

numpy.ptp(a, axis=None, out=None, keepdims=<no value>)
The syntax of the ptp() method

### Parameter values

The ptp() function takes the following parameter values:

• a: This is the input array and is a required value.
• axis (optional): This is the axis along which the range is to be determined. The value may also take a negative. In that case, it counts from the last to the first axis. This is an optional parameter.
• out(optional): This is an array-like object in which the result obtained is to be stored. This is an optional parameter.
• keepdims (optional): This takes a Boolean value indicating whether or not the axes reduced are left in the results as dimensions with size one. This is an optional parameter.

### Return value

The ptp() function returns an array holding the result.

### Example

Let's view the code for this method.

import numpy as np
# creating an input array
my_array = np.array([[1, 2, 5, 9], [3, 10, 4, 7]])

# obtaining the range from axis 0
print(np.ptp(my_array, axis=0))

# obtaining the range from axis 1
print(np.ptp(my_array, axis=1))
Implementing the ptp() function

### Explanation

• Line 1: We import the numpy module.
• Line 3: We create an input array, my_array using the array() function.
• Line 6: We use the ptp() function to obtain and then print the range of values from axis 0.
• Line 9: We use the ptp() function to obtain and then print the range of values from axis 1.

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python
numpy
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Onyejiaku Theophilus Chidalu
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