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MATLAB CREATE A SPIRAL IN MATRIX OF ANY SIZE
Create a spiral in matrix as shown in the figures on the first (visibile) page of the document
- Textbook notes
- • 2 pages •
Create a spiral in matrix as shown in the figures on the first (visibile) page of the document
Van Eck's sequence in Matlab
Van Eck's sequence in Matlab In recreational mathematics van Eck's sequence is an integer sequence defined recursively as follows. Let a0 = 0. Then, for n ≥ 0, if there exists an m < n such that am = an, take the largest such m and set an 1 = n − m; otherwise an 1 = 0. Thus the first occurrence of an integer in the sequence is followed by a 0, and the second and subsequent occurrences are followed by the size of the gap between the two most recent occurrences.
- Textbook notes
- • 2 pages •
Van Eck's sequence in Matlab In recreational mathematics van Eck's sequence is an integer sequence defined recursively as follows. Let a0 = 0. Then, for n ≥ 0, if there exists an m < n such that am = an, take the largest such m and set an 1 = n − m; otherwise an 1 = 0. Thus the first occurrence of an integer in the sequence is followed by a 0, and the second and subsequent occurrences are followed by the size of the gap between the two most recent occurrences.
Matlab Cody Problem 45. Make a Palindrome Number
Problem 45. Make a Palindrome Number
Created by Cody Team in Cody Challenge 
Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a reversed copy of itself.
 124
 421
 ----
 545
Let's try another.
 150
 051
 ----
 201
No, that didn't work, but what if we keep going?
 201
 102
 ----
 303
There, it became a palindrome again. Given a, return b = find_palindrome(a) such that b is the palindrome numb...
- Answers
- • 2 pages •
Problem 45. Make a Palindrome Number
Created by Cody Team in Cody Challenge 
Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a reversed copy of itself.
 124
 421
 ----
 545
Let's try another.
 150
 051
 ----
 201
No, that didn't work, but what if we keep going?
 201
 102
 ----
 303
There, it became a palindrome again. Given a, return b = find_palindrome(a) such that b is the palindrome numb...
Matlab Cody Problem 44. Trimming Spaces.
Problem 44. Trimming Spaces
Created by Cody Team in Cody Challenge 
Given a string, remove all leading and trailing spaces (where space is defined as ASCII 32).
 Input a = ' singular value decomposition '
 Output b is 'singular value decomposition'

- Answers
- • 2 pages •
Problem 44. Trimming Spaces
Created by Cody Team in Cody Challenge 
Given a string, remove all leading and trailing spaces (where space is defined as ASCII 32).
 Input a = ' singular value decomposition '
 Output b is 'singular value decomposition'

Matlab Cody Problem 38. Return a list sorted by number of occurrences
Problem 38. Return a list sorted by number of occurrences
Created by Cody Team in Cody Challenge 
Given a vector x, return a vector y of the unique values in x sorted by the number of occurrences in x.
Ties are resolved by a sort from lowest to highest.
So if
 x = [1 2 2 2 3 3 7 7 93]
then
 y = [2 3 7 1 93]

- Answers
- • 2 pages •
Problem 38. Return a list sorted by number of occurrences
Created by Cody Team in Cody Challenge 
Given a vector x, return a vector y of the unique values in x sorted by the number of occurrences in x.
Ties are resolved by a sort from lowest to highest.
So if
 x = [1 2 2 2 3 3 7 7 93]
then
 y = [2 3 7 1 93]

Matlab Cody Problem 128. Sorted highest to lowest.
Problem 128. Sorted highest to lowest?
Created by AMITAVA BISWAS in Community 
Return 1 if the input is sorted from highest to lowest, 0 if not.
Example:
 1:7 -> 0
 [7 5 2] -> 1

- Answers
- • 2 pages •
Problem 128. Sorted highest to lowest?
Created by AMITAVA BISWAS in Community 
Return 1 if the input is sorted from highest to lowest, 0 if not.
Example:
 1:7 -> 0
 [7 5 2] -> 1

Matlab Cody Problem 135. inner product of two vectors
Problem 135. inner product of two vectors
Created by AMITAVA BISWAS in Community 
inner product of two vectors

- Answers
- • 2 pages •
Problem 135. inner product of two vectors
Created by AMITAVA BISWAS in Community 
inner product of two vectors

Matlab Cody Problem 18. Bullseye Matrix
Problem 18. Bullseye Matrix
Created by Cody Team in Cody Challenge 
Given n (always odd), return output a that has concentric rings of the numbers 1 through (n 1)/2 around the center point. Examples:
 Input n = 3
 Output a is [ 2 2 2 
 2 1 2
 2 2 2 ]
 Input n = 5
 Output a is [ 3 3 3 3 3
 3 2 2 2 3 
 3 2 1 2 3
 3 2 2 2 3 
 3 3 3 3 3 ]

- Package deal
- Answers
- • 2 pages •
Problem 18. Bullseye Matrix
Created by Cody Team in Cody Challenge 
Given n (always odd), return output a that has concentric rings of the numbers 1 through (n 1)/2 around the center point. Examples:
 Input n = 3
 Output a is [ 2 2 2 
 2 1 2
 2 2 2 ]
 Input n = 5
 Output a is [ 3 3 3 3 3
 3 2 2 2 3 
 3 2 1 2 3
 3 2 2 2 3 
 3 3 3 3 3 ]

Matlab Cody Problem 40. Reverse Run-Length Encoder.
Problem 40. Reverse Run-Length Encoder
Created by Cody Team in Cody Challenge 
Given a "counting sequence" vector x, construct the original sequence y.
A counting sequence is formed by "counting" the entries in a given sequence. This is sometimes called run-length encoding.
For example, the sequence
 x = 2, 5, 1, 2, 4, 1, 1, 3
can be read as
 Two 5's, one 2, four 1's, one 3
which translates to
 y = 5, 5, 2, 1, 1, 1, 1, 3
So y is the reconstructed vector that corresponds to the counting seq...
- Package deal
- Answers
- • 2 pages •
Problem 40. Reverse Run-Length Encoder
Created by Cody Team in Cody Challenge 
Given a "counting sequence" vector x, construct the original sequence y.
A counting sequence is formed by "counting" the entries in a given sequence. This is sometimes called run-length encoding.
For example, the sequence
 x = 2, 5, 1, 2, 4, 1, 1, 3
can be read as
 Two 5's, one 2, four 1's, one 3
which translates to
 y = 5, 5, 2, 1, 1, 1, 1, 3
So y is the reconstructed vector that corresponds to the counting seq...