Neil Caithness
University of Oxford
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Professional Interests: unsupervised machine learning, anomaly detection, phylogenomics
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Solved
Back to basics 22 - Rotate a matrix
Covering some basic topics I haven't seen elsewhere on Cody. Rotate the input matrix 90 degrees counterclockwise (e.g. [1 2; ...
7 years ago
Solved
Get the length of a given vector
Given a vector x, the output y should equal the length of x.
7 years ago
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Check if number exists in vector
Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...
7 years ago
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Back to the future
See test suite See also: http://www.mathworks.com/matlabcentral/cody/problems/2449-back-to-the-future-ii
9 years ago
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Trimming Spaces
Given a string, remove all leading and trailing spaces (where space is defined as ASCII 32). Input a = ' singular value deco...
9 years ago
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Append two matrix as shown below example
Append two matrix as shown below example A=[1 2; 3 4] and B=[5 6;7 8] Answer must be 1 2 5 6 3...
9 years ago
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Convert String to Morse Code
Convert a given string to international <http://en.wikipedia.org/wiki/Morse_code Morse Code> * Strings will only have [A-z], ...
9 years ago
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Find 100 from a Matrix and Replace With 0 with less computation time
pls use this matrix x = [208 40 167 180 112 70 192 215 90 19 231 100 9 100 97 100 ...
9 years ago
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Remove white space from the string
Remove the white spaces (trailing and leading) from the input variable
9 years ago
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Genome decoding
Inspired by a question on the answer forum: You are given a matrix of 8-bit integers which encodes a genome. Each integer can...
9 years ago
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Return the first and last character of a string
Return the first and last character of a string, concatenated together. If there is only one character in the string, the functi...
9 years ago
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Initialize a varible with an integer value from a another variable which is assigned with a character value.
Initialize a varible with an integer value from a another variable which is assigned with a character value. ex: Test = 'c'...
9 years ago
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Altitude of locations on the earth
Find the altitude of a location on the earth, given latitude and longitude coordinates, above mean sea level. Input__________...
9 years ago
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Self-Description
This is a simplified version of the <http://xkcd.com/688/ *xkcd comic* by the same name>. Simply return the angle (in degrees...
9 years ago
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Calculate the h-index
H-index is a powerful tool for quantifying the scientific contribution of a researcher. H-index is defined as follows (source - ...
9 years ago
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Pizza value using expression with parentheses
Pizza prices are typically listed by diameter, rather than the more relevant feature of area. Compute a pizza's value (cost per ...
10 years ago
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Simple equation: Annual salary
Given an hourly wage, compute an annual salary by multiplying the wage times 40 and times 50, because salary = wage x 40 hours/w...
10 years ago
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Cell joiner
You are given a cell array of strings and a string delimiter. You need to produce one string which is composed of each string fr...
10 years ago
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Sum of diagonal of a square matrix
If x = [1 2 4; 3 4 5; 5 6 7] then y should be the sum of the diagonals of the matrix y = 1 + 4 + 7 = 12
10 years ago
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Back to basics 6 - Column Vector
Covering some basic topics I haven't seen elsewhere on Cody. Given an input vector, output true or false whether it is a colu...
10 years ago
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Create a row array using double colon operator
Create a row array from 9 to 1, using the double colon operator.
10 years ago
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Find the sum of the elements in the "second" diagonal
Find the sum of the elements in the diagonal that starts at the top-right corner and ends at the bottom-left corner.
10 years ago
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Replace NaNs with the number that appears to its left in the row.
Replace NaNs with the number that appears to its left in the row. If there are more than one consecutive NaNs, they should all ...
10 years ago
Solved
Find the longest sequence of 1's in a binary sequence.
Given a string such as s = '011110010000000100010111' find the length of the longest string of consecutive 1's. In this examp...
10 years ago
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Bullseye Matrix
Given n (always odd), return output a that has concentric rings of the numbers 1 through (n+1)/2 around the center point. Exampl...
10 years ago
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Nearest Numbers
Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...
10 years ago
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Return the largest number that is adjacent to a zero
This example comes from Steve Eddins' blog: <http://blogs.mathworks.com/steve/2009/05/27/learning-lessons-from-a-one-liner/ Lear...
10 years ago
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Which values occur exactly three times?
Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if x = [1 2...
10 years ago