# W. Owen Brimijoin

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**Feeds**

Solved

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...

8 years ago

Solved

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...

8 years ago

Solved

The Hitchhiker's Guide to MATLAB

Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

8 years ago

Solved

Who Has the Most Change?

You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

8 years ago

Solved

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 ...

8 years ago

Solved

Sum all integers from 1 to 2^n

Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

8 years ago

Solved

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...

8 years ago

Solved

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...

8 years ago

Solved

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 ...

8 years ago

Solved

Back and Forth Rows

Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

8 years ago

Solved

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...

8 years ago

Solved

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. Examp...

8 years ago

Solved

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...

8 years ago

Solved

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...

8 years ago

Solved

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...

8 years ago

Solved

Determine if input is odd

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

8 years 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...

8 years 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:...

8 years ago

Submitted

Oscillator and Signal Generator

A simple command-line function for generating standard waveforms, click trains and noise bursts.

8 years ago | 8 downloads |

Submitted

Round to X

Rounds the supplied N-D matrix to the values in a supplied array.

9 years ago | 1 download |

Column vector with interval

There are two ways to approach this and I think you're conflating the two: Here's one option colvec = [2:-.1:0]'; He...

9 years ago | 3

| accepted

Simple operation with vectors

Location of the max y values as the index into x: x(y==max(y))

9 years ago | 0

| accepted

Submitted

Time Series Indexing and Averaging

Outputs windowed means of a continuous set of data given a vector of labels and time stamps

9 years ago | 1 download |

how can i get the average of group of rows in time series?

I might suggest a function I have <http://www.mathworks.com/matlabcentral/fileexchange/47142-timeseries-indexer-labels-timestamp...

9 years ago | 0

How do I fix this uigetfile multiselect error?

Don't know if this is the cause of your problem, but I can say that uigetfile in 'MultiSelect' mode has the bothersome behavior ...

9 years ago | 0

| accepted

how to mix two audio signals

Simple mixing is just adding. y3 = y1 + y2; If you want to control the level of each within the mix, then you need to ad...

9 years ago | 2

| accepted

how to calculate element distance in a vector?

Try this: answer = sum((abs(diff(M,1,2))),2)

9 years ago | 2

how to calculate element distance in a vector?

It looks like you want the sum of the absolute value of the differential of those numbers? You get your first answer like this: ...

9 years ago | 1

| accepted

How to put wav file as input argument of a function ?

You need to load the signal that's in the file 'Songbird.wav' into the Matlab workspace first: stimulus = audioread('Songbi...

9 years ago | 0

generating aperodic impulse train or triangular pulse or rectangular pulse

It's a bit hard to know exactly what parameters you are after, but if all you are doing is making a click train with randomly ch...

9 years ago | 0