﻿ NumPy: Calculate the difference between neighboring elements, element-wise, and prepend [0, 0] and append  to a given array - w3resource # NumPy: Calculate the difference between neighboring elements, element-wise, and prepend [0, 0] and append  to a given array

## NumPy Mathematics: Exercise-30 with Solution

Write a NumPy program to calculate the difference between neighboring elements, element-wise, and prepend [0, 0] and append to a given array.

Sample Solution:-

Python Code:

``````import numpy as np
x = np.array([1, 3, 5, 7, 0])
print("Original array: ")
print(x)
r1 = np.ediff1d(x, to_begin=[0, 0], to_end=)
r2 = np.insert(np.append(np.diff(x), 200), 0, [0, 0])
assert np.array_equiv(r1, r2)
print("Difference between neighboring elements, element-wise, and prepend [0, 0] and append to the said array:")
print(r2)
```
```

Sample Output:

```Original array:
[1 3 5 7 0]
Difference between neighboring elements, element-wise, and prepend [0, 0] and append to the said array:
[  0   0   2   2   2  -7 200]
```

Python Code Editor:

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## Python: Tips of the Day

Getting rid of unwanted characters:

You can get rid of whitespaces or any specific character using strip methods in Python. You can use either plain strip for both sides, lstrip for the left side and rstrip for the right side only.

```str="+++Welcome python+++"
str.strip()

print(str)```

Output:

`+++Welcome python+++`