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Top 5 Numpy Excersices for Beginners
NumPy is a computational library that helps in speeding up Vector Algebra operations that involve Vectors (Distance between points, Cosine Similarity) and Matrices. Specifically, it helps in constructing powerful n-dimensional arrays that works smoothly with distributed and GPU systems. It is a very handy library and extensively used in the domains of Data Analytics and Machine Learning. Other than Python, it can also be used in tandem with languages like C and Fortran. Being an Open Source Library under a liberal BSD license, it is developed and maintained publicly on GitHub.Â
Here are 5 Basic NumPy Exercises which every beginner must go through and acquainted with.
NumPy Installation in Python
In the command line (cmd) type the following command,
pip install numpy
5 NumPy Exercises for Beginners
Importing NumPy and printing version number
import numpy as np print(np.__version__)
Corresponding Output
1.19.2
EXERCISE 1 – Element-wise addition of 2 numpy arrays
Given are 2 similar dimensional numpy arrays, how to get a numpy array output in which every element is an element-wise sum of the 2 numpy arrays?
Sample Solution
a = np.array([[1,2,3], [4,5,6]]) b = np.array([[10,11,12], [13,14,15]]) c = a + b print(c)
Corresponding Output
[[11 13 15] [17 19 21]]
EXERCISE 2 – Multiplying a matrix (numpy array) by a scalar
Given a numpy array (matrix), how to get a numpy array output which is equal to the original matrix multiplied by a scalar?
Sample Solution
a = np.array([[1,2,3], [4,5,6]]) b = 2*a # multiplying the numpy array a(matrix) by 2 print(b)
Corresponding Output
[[ 2 4 6] [ 8 10 12]]
EXERCISE 3 – Identity Matrix
Create an identity matrix of dimension 4-by-4
Sample Solution
i = np.eye(4)
print(i)
Corresponding Output
[[1. 0. 0. 0.] [0. 1. 0. 0.] [0. 0. 1. 0.] [0. 0. 0. 1.]]
EXERCISE 4 – Array re-dimensioning
Convert a 1-D array to a 3-D array
Sample Solution
a = np.array([x for x in range(27)])
o = a.reshape((3,3,3))
print(o)
Corrresponding Output
[[[ 0 1 2] [ 3 4 5] [ 6 7 8]] [[ 9 10 11] [12 13 14] [15 16 17]] [[18 19 20] [21 22 23] [24 25 26]]]
EXERCISE 5 – Array datatype conversion
Convert all the elements of a numpy array from float to integer datatype
Sample Solution
a = np.array([[2.5, 3.8, 1.5], [4.7, 2.9, 1.56]]) o = a.astype('int') print(o)
Corresponding Output
[[2 3 1] [4 2 1]]
Weekly Contest 247
- Maximum Product Difference Between Two Pairs
- Cyclically Rotating a Grid
- Number of Wonderful Substrings
- Count Ways to Build Rooms in an Ant Colony
Biweekly Contest 55
- Remove One Element to Make the Array Strictly Increasing
- Remove All Occurrences of a Substring
- Maximum Alternating Subsequence Sum
- Design Movie Rental System
June Long Challenge 2021 Solutions
- Maximum Frequent Subarray Sum solution codechef
- Dual Distance solution codechef
- Optimal Xor Set solution codechef
- Minimum Subtree Cover solution codechef
- Minimum Dual Area solution codechef
- Bitwise Tuples solution codechef
- Shortest Route solution codechef
- Bella ciao solution codechef
- Summer Heat solution codechef
March Long Challenge 2021 Solutions
- An Interesting Sequence ISS SOLUTION
- Tree House THOUSES SOLUTION
- Valid Paths VPATH SOLUTION
- Modular Equation MODEQ SOLUTION
- Tic Tac Toe TCTCTOE SOLUTION
- Xor Equality XOREQUAL SOLUTION
- Golf LKDNGOLF SOLUTION
- Solubility SOLBLTY SOLUTION
April Long Challenge 2021 Solutions
- Chef and Dice SDICE Solution
- Worthy Matrix KAVGMAT Solution
- Binary String MEX MEXSTR Solution
- Boolean Game BOOLGAME Solution
- Tree Permutations TREEPERM Solution
- Destroy the EMP Chip CHAOSEMP Solution
- Chef and Pair Flips PAIRFLIP Solution
- String Power STRPOW Solution
- Brahma and Shiva SHRINES Solution
- Water Sort Puzzle (Challenge) WTRSORT Solution
- World Record BOLT Solution
- Strong Language SSCRIPT Solution
- Valid Pair SOCKS1 Solution
Codechef Long Challenge Solutions
February Long Challenge 2021
- 1. Frog Sort Solution Codechef
- 2. Chef and Meetings Solution Codechef
- 3. Maximise Function Solution Codechef
- 4. Highest Divisor Solution Codechef
- 5. Cut the Cake Challenge Solution Codechef
- 6. Dream and the Multiverse Solution Codechef
- 7. Cell Shell Solution Codechef
- 8. Multiple Games Solution Codechef
- 9. Another Tree with Number Theory Solution Codechef
- 10. XOR Sums Solution Codechef
- 11. Prime Game Solution CodeChef
- 12. Team Name Solution Codechef
January Long Challenge 2021
- Chef and Division 3 DIVTHREE SOLUTION Code Chef
- Encoded String DECODEIT SOLUTION Code Chef
- Point Of Impact BILLRD SOLUTION Code Chef
- Fair Elections FAIRELCT SOLUTION Code Chef
- Watching CPL WIPL SOLUTION Code Chef
- Chef and Ants ANTSCHEF SOLUTION Code Chef
- Blackjack BLKJK SOLUTION Code Chef
- And-Or Game ORAND SOLUTION Code Chef
- Stack-Queue Sort (Challenge) SQSORT SOLUTION Code Chef
- Expected Number of SCCs RCTEXSCC SOLUTION Code Chef
- Curious Matrix CURMAT SOLUTION Code Chef
- Cool Subsets COOLSBST SOLUTION Code Chef
- Sequence Creation ARCRT SOLUTION Code Chef
- Greedy Students GRDSTD SOLUTION Code Chef
November Challenge 2020 SOLUTION CodeChef
- Ada and Dishes SOLUTION ADADISH
- Iron Magnet and Wall SOLUTION FEMA2
- Magical Candy Store SOLUTION CNDYGAME
- Unusual Queries SOLUTION UNSQUERS
- Red-Black Boolean Expression SOLUTION RB2CNF
- Chef and the Combination Lock SOLUTION CHEFSSM
- Scalar Product Tree SOLUTION SCALSUM
- Connect on a Grid (Challenge) SOLUTION CONGRID
October Lunchtime 2020 CodeChef SOLUTIONS
- AND Plus OR SOLUTION ANDOR
- Chef and Subtree MEXs SOLUTION SUBMEXS
- Chef Likes Good Sequences SOLUTION GSUB
- Cute Chef Gift SOLUTION COPAR
- Chef Is Just Throwing Random Words SOLUTION SSO
- Counting Spaghetti SOLUTION CDSUMS
- Chef and Edge Flipping SOLUTION EFLIP
Related :
- A. Shandom Ruffle SOLUTION
- B. Pear TreaP SOLUTION
- C. Sneetches and Speeches 3 SOLUTION
- D. The Grim Treaper SOLUTION
- Y. Sneetches and Speeches 1 SOLUTION
- Z. Trick or Treap SOLUTION
- A. Floor Number SOLUTION CODE FORCES
- B. Symmetric Matrix SOLUTION CODE FORCES
- C. Increase and Copy SOLUTION CODE FORCES
- D. Non-zero Segments SOLUTION CODE FORCES
- E. Rock, Paper, Scissors SOLUTION CODE FORCES
- F. Number of Subsequences SOLUTION CODE FORCES
Related :
- Chef and Easy Queries SOLUTIONS CHEFEZQ
- Covid Run SOLUTIONS CVDRUN OCTOBER CHALLENGE
- Positive AND SOLUTIONS POSAND
- Replace for X SOLUTIONS REPLESX
- Village Road Network SOLUTIONS VILLNET
- Random Knapsack SOLUTIONS RANDKNAP
- D-Dimensional MST SOLUTIONS DDIMMST
- Compress all Subsegments SOLUTIONS SEGCOMPR
- Adding Squares SOLUTIONS ADDSQURE
- Inversions SOLUTIONS INVSMOD2 OCOTBER CHALLENGE
- Rooted Minimum Spanning Tree SOLUTIONS ROOTMST