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Reverse the Words (not letters) of a String
*Description* Change the words of a string such that the words appear in reverse order. You may assume that the string is a n...

casi 14 años hace

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Doubling elements in a vector
Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

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High school cafeteria
Given an input vector of positive integers, return a row vector with the primes first (in increasing order) and the composites n...

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2 b | ~ 2 b
Given a string input, output true if there are 2 b's in it, false if otherwise Examples: 'Macbeth' -> false 'Publius Cor...

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How to plot a point on axes above current picture
hold on The above command allows you to plot data to your current axes without erasing previously plotted data. If you ...

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Is this matrix orthogonal?
Given a square matrix, a, determine whether it is orthogonal. INPUT: a, a n x n matrix OUTPUT: true or false

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Back to basics 16 - byte order
Covering some basic topics I haven't seen elsewhere on Cody. Switch the byte order of the input (i.e. if little-endian -> big...

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No Twins?
Write a function that accepts as input a vector and returns the same vector, but retaining only the first occurrence of an eleme...

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Is A the inverse of B?
Given a matrix A and a matrix B, is A the inverse of B? >>A=[2,4;3,5]; >>B=[-2.5,2;1.5,-1]; >>isInverse...

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Magic!
Check whether the input matrix is a normal magic square: <http://en.wikipedia.org/wiki/Magic_square> Output the logical va...

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Why do I get this result??
The below line is the culprit: elseif 3.65<k<=4.35 Specifying inequalities in matlab isn't done in the same notation as...

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save the information of the point by clicking on the graph
You can get the indices of your selection by calling datacursormode and setting a custom update function. Example: function...

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Counting Sequence
Given a vector x, find the "counting sequence" y. A counting sequence is formed by "counting" the entries in a given sequence...

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All your base are belong to us
Find the base _b_ logarithm of the input decimal number _x_. Express the output as a decimal number. The first argument is the n...

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Back to basics 17 - white space
Covering some basic topics I haven't seen elsewhere on Cody. Remove the trailing white spaces from the input variable

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Specific Element Count
Given a vector _v_ and a element _e_, return the number of occurrences of _e_ in _v_. Note: NaNs are equal and there may be n...

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Understand if a char variable is an alphanumeric, a numeric or a string
If a char is numeric, the following command will return false: isempty(str2double(s)) %where s is your char One way I ...

casi 14 años hace | 0

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Count photos
Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total nu...

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Solve the Sudoku Row
*Description* A simple yet tedious task occurs near the end of most Sudoku-solving algorithms, computerized or manual. The ta...

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How can i select (check off) multiple checkboxes?
If you want to avoid using a for loop, the following functions might be useful: help findobj help regexp Assuming...

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DC chopper
Input x is the sampled signal vector, may have both AC and DC components. output vector y should have AC components removed then...

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Tricky timing
Write a function that takes between 0.5 seconds and 0.6 seconds to run.

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Right and wrong
Given a vector of lengths [a b c], determines whether a triangle with those sides lengths is a right triangle: <http://en.wikipe...

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Angle between two vectors
You have two vectors , determine the angle between these two vectors For example: u = [0 0 1]; v = [1 0 0]; The a...

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What setting do I change so that all files opened in the editor are accessed by a single tabbed matlab editor window?
As far as I know, there is no setting that allows this view option to be explicitly specified. However, MATLAB remembers your...

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Return unique values without sorting
If the input vector A is [42 1 1], the output value B must be the unique values [42 1] The *values of B are in the s...

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Number of Horns on a unicorn!
Calculate the number of horns on a *unicorn*! And I'm talking about a unicorn with not more than one horn on it!

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Vectorize the digits of an Integer
Create a vector of length N for an integer of N digits. x=123045; x_vec=[1 2 3 0 4 5]; I happened upon a trick to do ...

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Create a square matrix of multiples
Given an input, N, output a matrix N x N with each row containing multiples of the first element of each row. This also applies...

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Return the 'Size' of a String of Code
One of the most 'mysterious' parts of playing Cody is the sizing system. Given a string of commands, return the size that Cody w...

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