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Benjamin Kraus


Boston University

57 total contributions since 2010

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Submitted


readPLXFileC
A MEX function to read a PLX data file (Plexon, Inc.).

3 years ago | 12 downloads |

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Submitted


matwho
Quickly list the variables in the specified .MAT file.

3 years ago | 1 downloads |

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Submitted


nanconv
Convolution in 1D or 2D ignoring NaNs and (optionally) correcting for edge effects.

3 years ago | 16 downloads |

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Submitted


nantowhite
Convert a 2D matrix into an image with NaNs replaced by white

3 years ago | 3 downloads |

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nanconvn
Convolution in ND ignoring NaNs and (optionally) correcting for edge effects.

3 years ago | 2 downloads |

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Solved


Find state names that end with the letter A
Given a list of US states, remove all the states that end with the letter A. Example: Input s1 = 'Alabama Montana Nebras...

3 years ago

Solved


Kaprekar Steps
6174 is the <http://en.wikipedia.org/wiki/6174_%28number%29 Kaprekar constant>. All natural numbers less than 10,000 (except som...

3 years ago

Solved


Find relatively common elements in matrix rows
You want to find all elements that exist in greater than 50% of the rows in the matrix. For example, given A = 1 2 3 5 ...

3 years ago

Solved


Alphabetize by last name
Given a list of names in a cell array, sort the list by the last name. So if list = {'Barney Google','Snuffy Smith','Dagwood ...

3 years ago

Solved


Interpolator
You have a two vectors, a and b. They are monotonic and the same length. Given a value, va, where va is between a(1) and a(end...

3 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...

3 years ago

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...

4 years ago

Posted


Speed up large file reading
I'm trying to speed up two pure m-file functions that I wrote for reading pieces of data from a binary data file. The data files...

4 years ago | 1232 views

Posted


Fit a linear function of two angles
I've got two lists of angles (in radians, ranging from -pi to pi), that have a fixed offset from each other (plus a fair bit of ...

4 years ago | 3404 views

Solved


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...

4 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".

4 years ago

Solved


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

4 years ago

Solved


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

4 years ago

Solved


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

4 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. Example...

4 years ago

Solved


Sort numbers by outside digits
Sort the array so that they are sorted as if their value was a 5 digit number made from the first three and last two digits of t...

4 years ago

Solved


Poker Series 05: isStraight
The Poker Series consists of many short, well defined functions that when combined will lead to complex behavior. Our goal is t...

4 years ago

Solved


Poker Series 04: isFlush
The Poker Series consists of many short, well defined functions that when combined will lead to complex behavior. Our goal is t...

4 years ago

Solved


Poker Series 03: isFullHouse
The Poker Series consists of many short, well defined functions that when combined will lead to complex behavior. Our goal is t...

5 years ago

Solved


Poker Series 02: isQuads
The Poker Series consists of many short, well defined functions that when combined will lead to complex behavior. Our goal is to...

5 years ago

Solved


Poker Series 01: isStraightFlush
The Poker Series consists of many short, well defined functions that when combined will lead to complex behavior. Our goal is t...

5 years ago

Solved


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

5 years ago

Solved


Eight Queens Solution Checker
Write a function to verify whether an arrangement of queens on a chessboard is a valid solution to the classic <http://en.wikipe...

5 years ago

Responded


Re: Quickly list variables in a MAT-file
James, Thanks for your feedback. I'm not as familiar with MEX programming as I am with MATLAB in general (and my general C know...

5 years ago | 10462 views

Responded


Re: Quickly list variables in a MAT-file
include "string.h" #include "mex.h" #include "mat.h" void mexFunction( { }

5 years ago | 10462 views

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