# Problems

1 – 50 of 76
 Problem Title Likes Solvers Difficulty

#### Problem 5. Triangle Numbers

Created by: Cody Team

Tags math, triangle, nice

107

21454

#### Problem 26. Determine if input is odd

Created by: Cody Team

114

20980

#### Problem 6. Select every other element of a vector

Created by: Cody Team

144

25170

#### Problem 17. Find all elements less than 0 or greater than 10 and replace them with NaN

Created by: Cody Team

61

14195

#### Problem 76. De-dupe

Created by: Cody Team

Tags matlab

11

2241

#### Problem 35. Quote Doubler

Created by: Cody Team

9

2238

#### Problem 33. Create times-tables

Created by: Cody Team

Tags matrices

83

12638

#### Problem 41. Cell joiner

Created by: Cody Team

Tags strings, matlab

28

4202

#### Problem 14. Find the numeric mean of the prime numbers in a matrix.

Created by: Cody Team

Tags easy, matrices

42

7674

#### Problem 19. Swap the first and last columns

Created by: Cody Team

83

15545

#### Problem 30. Sort a list of complex numbers based on far they are from the origin.

Created by: Cody Team

23

4844

#### Problem 12. Fibonacci sequence

Created by: Cody Team

93

11345

#### Problem 20. Summing digits

Created by: Cody Team

Tags strings, sum

32

6514

#### Problem 32. Most nonzero elements in row

Created by: Cody Team

Tags matrices

36

6434

#### Problem 72. Interpolator

Created by: Cody Team

32

2881

#### Problem 9. Who Has the Most Change?

Created by: Cody Team

70

7674

#### Problem 21. Return the 3n+1 sequence for n

Created by: Cody Team

Tags 3n+1, sample

73

6993

#### Problem 10. Determine whether a vector is monotonically increasing

Created by: Cody Team

106

15266

#### Problem 25. Remove any row in which a NaN appears

Created by: Cody Team

70

7583

#### Problem 22. Remove the vowels

Created by: Cody Team

Tags regexp, siam

23

5306

#### Problem 4. Make a checkerboard matrix

Created by: Cody Team

183

13966

#### Problem 62. Elapsed Time

Created by: Cody Team

Tags time

14

2209

#### Problem 66. Find the two-word state names

Created by: Cody Team

Tags regexp, states

5

960

#### Problem 39. Which values occur exactly three times?

Created by: Cody Team

Tags search

20

4358

#### Problem 40. Reverse Run-Length Encoder

Created by: Cody Team

Tags encoding

15

1974

#### Problem 73. Replace NaNs with the number that appears to its left in the row.

Created by: Cody Team

Tags matlab

16

2413

#### Problem 44. Trimming Spaces

Created by: Cody Team

9

1806

#### Problem 50. QWERTY coordinates

Created by: Cody Team

Tags indexing

18

1831

#### Problem 28. Counting Money

Created by: Cody Team

Tags regexp, strings

14

2879

#### Problem 42. Find the alphabetic word product

Created by: Cody Team

Tags matlab

10

2706

#### Problem 57. Summing Digits within Text

Created by: Cody Team

Tags strings

10

1832

#### Problem 87. Indexed Probability Table

Created by: Cody Team

Tags matlab

7

1737

#### Problem 94. Target sorting

Created by: Cody Team

Tags sorting, matlab

26

3814

#### Problem 46. Which doors are open?

Created by: Cody Team

24

2602

#### Problem 60. The Goldbach Conjecture

Created by: Cody Team

Tags primes

55

4583

#### Problem 49. Sums with Excluded Digits

Created by: Cody Team

Tags strings

12

1610

#### Problem 77. Clean the List of Names

Created by: Cody Team

Tags strings

3

1182

#### Problem 13. Remove all the consonants

Created by: Cody Team

Tags regexp, basics

23

3512

#### Problem 23. Finding Perfect Squares

Created by: Cody Team

Tags sets

121

13285

#### Problem 37. Pascal's Triangle

Created by: Cody Team

21

3454

#### Problem 27. Pangrams!

Created by: Cody Team

Tags strings

31

3018

#### Problem 53. Duplicates

Created by: Cody Team

5

1632

#### Problem 16. Return the largest number that is adjacent to a zero

Created by: Cody Team

Tags vectors

25

4374

#### Problem 74. Balanced number

Created by: Cody Team

Tags matlab

19

2327

#### Problem 80. Test for balanced parentheses

Created by: Cody Team

Tags regexp, parens

9

1009

#### Problem 47. Extract leading non-zero digit

Created by: Cody Team

5

1558

#### Problem 51. Find the two most distant points

Created by: Cody Team

Tags distance

8

2095

#### Problem 85. Remove the polynomials that have positive real elements of their roots.

Created by: Cody Team

Tags matlab

3

1044

#### Problem 15. Find the longest sequence of 1's in a binary sequence.

Created by: Cody Team

67

4540

#### Problem 48. Making change

Created by: Cody Team

Tags money, subs

15

2692

1 – 50 of 76