100 Julia exercises with solutions


Here is a Julia version of exercises with solutions which is based on the exercises given here: https://github.com/rougier/numpy-100

1. Import the julia package LinearAlgebra under the name la


2. Print the version of julia package Javis


3. Create a zero vector of size 10 and of type Int64


4. How to find the memory size of any array in bytes


5. How to get the documentation of the Julia zero function from the command line?


6. Create a Int vector of size 10 but the fifth value which is 1 (in two lines of code)


7. Create a vector with values ranging from 10 to 49


8. Return the reverse of a vector (first element becomes last)


9. Create a 3x3 matrix with values ranging from 0 to 8


10. Find indices of non-zero elements from [1,2,0,0,4,0]


11. Create a 3x3 identity matrix


12. Create a 3x3x3 array with random values


13. Create a 10x10 array with random values and find the minimum and maximum values

14. Create a random vector of size 30 and find the mean value


15. Create a 2d array with 1 on the border and 0 inside


16. How to add a border (filled with 0's) around an existing array?


17. What is the result of the following expression? (★☆☆)

18. Create a 5x5 matrix with values 1,2,3,4 just below the diagonal


19. Create a 8x8 matrix and fill it with a checkerboard pattern


20. Consider a (6,7,8) shape array, what is the index (x,y,z) of the 100th element?


21. Create a checkerboard 8x8 matrix using the repeat function (★☆☆)


22. Normalize a 5x5 random matrix (★☆☆)


23. Create a custom dtype that describes a color as four unsigned bytes (RGBA) (★☆☆)

24. Multiply a 5x3 matrix by a 3x2 matrix (real matrix product)


25. Given a 1D array, negate all elements which are between 3 and 8, in place. (★☆☆)


26. What is the output of the following script? (★☆☆) [Python only]

28. What are the result of the following expressions? (★☆☆)

29. How to round away from zero a float array ? (★☆☆)


30. How to find common values between two arrays? (★☆☆)

32. Is the following expressions true? [Python only]★☆☆)

33. How to get the dates of yesterday, today and tomorrow? (★☆☆)


34. How to get all the dates corresponding to the month of July 2016? (★★☆)


35. How to compute ((A+B)*(-A/2)) in place (without copy)? (★★☆)

36. Extract the integer part of a random array of positive numbers using 4 different methods (★★☆)

37. Create a 5x5 matrix with row values ranging from 0 to 4 (★★☆)


38. Consider a generator function that generates 10 integers and use it to build an array (★☆☆)


39. Create a vector of size 10 with values ranging from 0 to 1, both excluded (★★☆)

40. Create a random vector of size 10 and sort it (★★☆)

41. How to sum a small array faster than np.sum?[Python only] (★★☆)

42. Consider two random array A and B, check if they are equal (★★☆)


43. Make an array immutable (read-only) (★★☆)

44. Consider a random 10x2 matrix representing cartesian coordinates, convert them to polar coordinates (★★☆)

45. Create random vector of size 10 and replace the maximum value by 0 (★★☆)


46. Create a structured array with x and y coordinates covering the [0,1]x[0,1] area (★★☆)


47. Given two arrays, X and Y, construct the Cauchy matrix C (Cij =1/(xi - yj)) (★★☆)


48. Print the minimum and maximum representable value for each Julia scalar type


49. How to print all the values of an array? (★★☆)


50. How to find the closest value (to a given scalar) in a vector? (★★☆)


I will update remaining exercises in due course.


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