luke

Active since 2011

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Create times-tables
At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

meer dan 13 jaar ago

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Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

meer dan 13 jaar ago

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Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

meer dan 13 jaar ago

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Remove any row in which a NaN appears
Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

meer dan 13 jaar ago

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Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

meer dan 13 jaar ago

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Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

meer dan 13 jaar ago

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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

meer dan 13 jaar ago

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Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

meer dan 13 jaar ago

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Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

meer dan 13 jaar ago

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Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

meer dan 13 jaar ago

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Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

meer dan 13 jaar ago

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Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

meer dan 13 jaar ago

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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

meer dan 13 jaar ago

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Is my wife right?
Regardless of input, output the string 'yes'.

meer dan 13 jaar ago

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Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

meer dan 13 jaar ago

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

meer dan 13 jaar ago

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Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

meer dan 13 jaar ago

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Add two numbers
Given a and b, return the sum a+b in c.

meer dan 13 jaar ago

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Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

meer dan 13 jaar ago

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Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

meer dan 13 jaar ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

meer dan 13 jaar ago

Solved

Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

meer dan 13 jaar ago

Question

Conditionally Format Bar Chart
Is it possible to create a conditionally formatted bar chart? I have a time series bar chart that has positive and negative v...

meer dan 13 jaar ago | 2 answers | 0

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answers

Question

String and cell compares?
I am having a problem with the below code. I have a field, "name" which I included a sample below. I am trying to do some contr...

meer dan 13 jaar ago | 1 answer | 0

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answer

Question

Webinar - PDF?
For this webinar Algorithmic Trading : Simple Lead Lag EMA There was a PDF that had all of the code and a write up of the we...

bijna 14 jaar ago | 1 answer | 0

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answer

Question

Logical Indexing into 2d matrix
I am trying to use a logical vector to pull out all data from a 2d matrix. The data is below 67 75 52 44 2...

bijna 14 jaar ago | 1 answer | 0

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Question

Control Break Processing
[EDIT: 20110720 16:05 CDT - reformat - WDR] I have 3 column vectors (Date1 Date2 and Error) and what I want to do is create the...

meer dan 14 jaar ago | 2 answers | 0

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Answered
Sorting Cell stucture with different data types
This is what C looks like <3503x1 cell> <3503x1 double> <3503x1 cell> <3503x1 double> <3503x1 cell> <3503x1 double>...

meer dan 14 jaar ago | 0

Answered
Sorting Cell stucture with different data types
Also, all of the string data are cell arrays. So this is a Cell Array in a Cell Array

meer dan 14 jaar ago | 0

Question

Sorting Cell stucture with different data types
I have a cell structure with 32 columns of data I read in the data in a cell Structure C = textscan(fid,'%s%f%s%f%s%f%f%f%f%f...

meer dan 14 jaar ago | 3 answers | 0

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