﻿ NumPy: Test element-wise of a given array for finiteness, positive or negative infinity, for NaN, for NaT, for negative infinity, for positive infinity - w3resource

# NumPy: Test element-wise of a given array for finiteness, positive or negative infinity, for NaN, for NaT, for negative infinity, for positive infinity

## NumPy Statistics: Exercise-11 with Solution

Write a NumPy program to test element-wise of a given array for finiteness (not infinity or not Not a Number), positive or negative infinity, for NaN, for NaT (not a time), for negative infinity, for positive infinity.

Sample Solution:-

Python Code:

``````import numpy as np
print("\nTest element-wise for finiteness (not infinity or not Not a Number):")
print(np.isfinite(1))
print(np.isfinite(0))
print(np.isfinite(np.nan))
print("\nTest element-wise for positive or negative infinity:")
print(np.isinf(np.inf))
print(np.isinf(np.nan))
print(np.isinf(np.NINF))
print("Test element-wise for NaN:")
print(np.isnan([np.log(-1.),1.,np.log(0)]))
print("Test element-wise for NaT (not a time):")
print(np.isnat(np.array(["NaT", "2016-01-01"], dtype="datetime64[ns]")))
print("Test element-wise for negative infinity:")
x = np.array([-np.inf, 0., np.inf])
y = np.array([2, 2, 2])
print(np.isneginf(x, y))
print("Test element-wise for positive infinity:")
x = np.array([-np.inf, 0., np.inf])
y = np.array([2, 2, 2])
print(np.isposinf(x, y))
```
```

Sample Output:

```Test element-wise for finiteness (not infinity or not Not a Number):
True
True
False

Test element-wise for positive or negative infinity:
True
False
True
Test element-wise for NaN:
[ True False False]
Test element-wise for NaT (not a time):
[ True False]
Test element-wise for negative infinity:
[1 0 0]
Test element-wise for positive infinity:
[0 0 1]
```

Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

What is the difficulty level of this exercise?

Test your Python skills with w3resource's quiz

﻿

## Python: Tips of the Day

Chain Operators

You can chain comparison operators in Python as following: n = 10 result = 1 < n < 20

```distance = 200
checker = 100 < distance < 350

print(checker)
```

Output:

`True`