Community Profile

# Brian Butler

### Butler Research

107 total contributions since 2015

Brian K. Butler received the B.S. degree in engineering from Harvey Mudd College, Claremont, CA, in 1989, the M.S. degree in electrical engineering from Stanford University, Stanford, CA, in 1990, and the Ph.D. degree in electrical and computer engineering from the University of California, San Diego (UCSD), in 2013. At UCSD, he was affiliated with the Center for Magnetic Recording Research. His research interests include coding, modulation, and the design of wireless systems and receivers.

He was with QUALCOMM, Inc., San Diego, CA, during the summer of 1989 and from 1990 until 2008. Dr. Butler holds 39 issued U.S. patents and several foreign.

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Matrix Permanent Using Recursion
Computes the permanent of a matrix.

Solved

Compute Fibonacci Number
Compute the _n_-th Fibonacci Number f(0) = 0, f(1) = 1, f(2) = 1, f(3) = 2, ... f(42) = 267914296

fast 4 Jahre ago

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Function Iterator
Given a handle fh to a function which takes a scalar input and returns a scalar output and an integer n >= 1, return a handle f...

fast 4 Jahre ago

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Make a Palindrome Number
Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a revers...

fast 4 Jahre ago

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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...

fast 4 Jahre ago

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Remove all the consonants
Remove all the consonants in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill'; Output s2 is 'a ...

fast 4 Jahre ago

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Dimensions of a rectangle
The longer side of a rectangle is three times the length of the shorter side. If the length of the diagonal is x, find the width...

fast 4 Jahre ago

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Side of an equilateral triangle
If an equilateral triangle has area A, then what is the length of each of its sides, x? <<http://upload.wikimedia.org/wikipe...

fast 4 Jahre ago

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Triangle sequence
A sequence of triangles is constructed in the following way: 1) the first triangle is Pythagoras' 3-4-5 triangle 2) the s...

fast 4 Jahre ago

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Find a Pythagorean triple
Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...

fast 4 Jahre ago

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Area of an equilateral triangle
Calculate the area of an equilateral triangle of side x. <<http://upload.wikimedia.org/wikipedia/commons/e/e0/Equilateral-tr...

fast 4 Jahre ago

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Area of an Isoceles Triangle
An isosceles triangle has equal sides of length x and a base of length y. Find the area, A, of the triangle. <<http://upload...

fast 4 Jahre ago

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Flag largest magnitude swings as they occur
You have a phenomenon that produces strictly positive or negative results. delta = [1 -3 4 2 -1 6 -2 -7]; Marching thr...

fast 4 Jahre ago

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Implement simple rotation cypher
If given a letter from the set: [abc...xyz] and a shift, implement a shift cypher. Example: 'abc' with a shi...

fast 4 Jahre ago

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Find the two most distant points
Given a collection of points, return the indices of the rows that contain the two points most distant from one another. The inpu...

fast 4 Jahre ago

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Interior angles
Find the sum of interior angles for polygon of x sides.

fast 4 Jahre ago

Problem

What's the missing interior angle?
I'm talking about polygons... The sum of the interior angles of a triangle is 180 degrees. The sum of the interior angles of a...

fast 4 Jahre ago | 0

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Factorize THIS, buddy
List the prime factors for the input number, in decreasing order. List each factor only once, even if the factorization includes...

fast 4 Jahre 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,...

fast 4 Jahre ago

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Tell me the slope
Tell me the slope, given a vector with horizontal run first and vertical rise next. Example input: x = [10 2];

fast 4 Jahre ago

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Program an exclusive OR operation with logical operators
Program an exclusive or operation *without* using the MATLAB function xor. Use logical operators like |, &, ~, ... instead. ...

fast 4 Jahre ago

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Sums with Excluded Digits
Add all the integers from 1 to n in which the digit m does not appear. m will always be a single digit integer from 0 to 9. no...

fast 4 Jahre ago

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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...

fast 4 Jahre ago

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Population growth
Assign finalPopulation with the population size given an initial population, population growth rate, and number of years. The fi...

fast 4 Jahre ago

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All capital?
Are all the letters in the input string capital letters? Examples: 'MNOP' -> 1 'MN0P' -> 0

fast 4 Jahre 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.

fast 4 Jahre ago

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Side of a rhombus
If a rhombus has diagonals of length x and x+1, then what is the length of its side, y? <<http://upload.wikimedia.org/wikipe...

fast 4 Jahre ago

Solved

Can you reshape the matrix?
Given a matrix A, is it possible to reshape it into another matrix with the given number of rows?

fast 4 Jahre ago

Solved

Which doors are open?
There are n doors in an alley. Initially they are all shut. You have been tasked to go down the alley n times, and open/shut the...

fast 4 Jahre ago

Solved

Return a list sorted by number of occurrences
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 ...

fast 4 Jahre ago