NumPy: Set the array values with specified precision

Last update on March 24 2025 13:38:28 (UTC/GMT +8 hours)

Create a random 10x4 array with precision control.

Write a NumPy program to create a 10x4 array filled with random floating point number values with and set the array values with specified precision.

Sample Solution:

Python Code:

# Importing NumPy library
import numpy as np

# Generating a random 10x4 array
nums = np.random.randn(10, 4)

# Displaying the original array
print("Original arrays:")
print(nums)

# Setting the precision of the array to a specific value (4 decimal places)
np.set_printoptions(precision=4)

# Displaying the array with the specified precision
print("Set the array values with specified precision:")
print(nums)

Sample Output:

Original arrays:
[[-1.23335604  0.54368124  1.93500931 -0.45001639]
 [ 1.20528013  2.04423279 -0.68858903 -0.46642789]
 [ 1.29030601  0.60914425  0.03139104 -1.72528221]
 [-0.32607231 -2.36951679 -0.80374203 -0.26212641]
 [-0.16426628 -0.21524949 -0.35957311 -2.27709735]
 [-0.28851276 -0.59101441  0.22293919 -0.50128832]
 [ 1.3577567   0.05529019  0.81208832  0.70810424]
 [ 0.46853801 -0.81857981  0.80443323  0.52391606]
 [-0.29149088 -0.91153449 -1.00515549  0.31065165]
 [ 2.68952752  1.86676839  1.49239198 -1.0409156 ]]
Set the array values with specified precision:
[[-1.2334  0.5437  1.935  -0.45  ]
 [ 1.2053  2.0442 -0.6886 -0.4664]
 [ 1.2903  0.6091  0.0314 -1.7253]
 [-0.3261 -2.3695 -0.8037 -0.2621]
 [-0.1643 -0.2152 -0.3596 -2.2771]
 [-0.2885 -0.591   0.2229 -0.5013]
 [ 1.3578  0.0553  0.8121  0.7081]
 [ 0.4685 -0.8186  0.8044  0.5239]
 [-0.2915 -0.9115 -1.0052  0.3107]
 [ 2.6895  1.8668  1.4924 -1.0409]]

Explanation:

In the above exercise -

nums = np.random.randn(10, 4): This code generates a 10x4 array with random numbers drawn from a standard normal distribution. The np.random.randn() function takes the shape of the output array as its arguments.

np.set_printoptions(precision=4): This code sets the global print options for NumPy. In this case, the precision parameter is set to 4, which means that when NumPy arrays are printed, their elements will be displayed with 4 decimal places.

print(nums): Finally print() function prints the generated 10x4 array with the specified precision (4 decimal places).

For more Practice: Solve these Related Problems:

• Write a NumPy program to generate a 10x4 array of random floats and then format its output to a specified precision using np.set_printoptions.
• Create a function that rounds the elements of a random array to a given number of decimal places and prints the result.
• Implement a solution that uses np.around to control the precision of the array values before display.
• Test the precision control on arrays with both very small and very large float values to ensure consistent formatting.

Python-Numpy Code Editor: