David K

Last seen: 4日前

222 2015 年以降の合計貢献数

I spend a lot of time in MATLAB, with my focus on signal processing and data analysis.

David K's バッジ

解決済み

Big numbers, repeated least significant digits
This problem builds off of <http://www.mathworks.com/matlabcentral/cody/problems/3077-big-numbers-least-significant-digits/ Prob...

18日前

解決済み

Big numbers, least significant digits
Given two numbers, x and n, return the last d digits of the number that is calculated by x^n. In all cases, d will be the number...

19日前

質問

Parfor converting object to double?
I am trying to parallelize some of my code to make it run quicker and ran into a weird error that I get in 2019a but not in 2020...

23日前 | 1 件の回答 | 0

1

回答

質問

How to parallelize when loading lots of data
I have been struggling to speed up my MATLAB code which loads a number of large data files into custom class objects. My two cla...

23日前 | 1 件の回答 | 0

1

回答

解決済み

Find the biggest empty box
You are given a matrix that contains only ones and zeros. Think of the ones as columns in an otherwise empty floor plan. You wan...

約1ヶ月前

解決済み

Solitaire Cipher
Implement the <http://en.wikipedia.org/wiki/Solitaire_(cipher) solitaire cipher>. Since this is from Wikipedia, I am capturin...

約1ヶ月前

解決済み

Given a window, how many subsets of a vector sum positive
Given a vector: [1 0 -1 3 2 -3 1] and a window of 2, A sliding window would find: 1 + 0 = 1 0 - 1 = -1 ...

3ヶ月前

解決済み

Find a subset that divides the vector into equal halves
Given a vector x, return the indices to elements that will sum to exactly half of the sum of all elements. Example: Inpu...

3ヶ月前

解決済み

How many trades represent all the profit?
Given a list of results from trades made: [1 3 -4 2 -1 2 3] We can add them up to see this series of trades made a profit ...

3ヶ月前

解決済み

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...

3ヶ月前

解決済み

Make a run-length companion vector
Given a vector x, return a vector r that indicates the run length of any value in x. Each element in r shows how many times the ...

3ヶ月前

解決済み

Spot the outlier
All points except for one lie on a line. Which one is the outlier? Example: You are given a list of x-y pairs in a column ...

3ヶ月前

解決済み

With apologies to William Blake
Coder Coder, typing fast Sitting at your desk, aghast. What immortal MATLAB script will solve this problem, nice and qu...

3ヶ月前

解決済み

Evened up (or not)
You will be provided with an array or matrix that contains various numbers, in addition to an evening variable, e, set to 1 or 0...

3ヶ月前

解決済み

De-primed
Write a function that will multiply every prime number in the array or matrix by two, leaving all other numbers the same, and re...

3ヶ月前

解決済み

Find out the Gray Code for a Given Binary Number
Find out <http://en.wikipedia.org/wiki/Gray_code Gray Code> for a given binary number Example Binary input 1000 Gray ...

3ヶ月前

解決済み

Digital Neighbourhood
Given a natural number reorder its digits to create another number, closest to the given one. Examples: * 123 gives 132, ...

3ヶ月前

解決済み

Binary Neighbourhood
Given a natural number reorder its binary form to create another number, closest to the given one. Examples: * 1 gives 2, ...

3ヶ月前

解決済み

Convert to Binary Coded Decimal
Convert from decimal representation to <http://en.wikipedia.org/wiki/Binary-coded_decimal Binary Code Decimal> (or BCD) represen...

3ヶ月前

解決済み

Consecutive Equation Times (of the day)
Many times throughout the day can represent mathematical equations. In this problem, we focus on the largest consecutive run of ...

3ヶ月前

解決済み

Equation Times (of the day)
Many times throughout the day can represent mathematical equations. In this problem, we focus on times that include the four bas...

3ヶ月前

解決済み

Power Times (of the day)
Many times throughout the day can represent mathematical equations. In this problem, we focus on times that represent powers. Fo...

3ヶ月前

解決済み

Bit calculation
Give me the count of numbers from 1 to n having their last two bits as 0. For example function y = ret_count(4) y = x...

3ヶ月前

解決済み

Mysterious digits operation (easy)
What is this digit operation? 0 -> 0 1 -> 9 121 -> 9 44 -> 6 15 -> 5 1243 -> 7 ...

3ヶ月前

質問

Major slowdown when clearing objects in the wrong order
I've built a set of custom classes that I use for accessing and analyzing our datasets. I've run into the problem that when I ru...

3ヶ月前 | 0 件の回答 | 0

0

回答

質問

How to disable title of ButtonGroup
I have an app I've created using App Designer. Included is a Button Group that I would like to Enable and Disable with a checkbo...

3ヶ月前 | 1 件の回答 | 0

1

回答

解決済み

Project Euler: Problem 9, Pythagorean numbers
A Pythagorean triplet is a set of three natural numbers, a b c, for which, a^2 + b^2 = c^2 For example, 3^2 + 4^2 =...

3ヶ月前

解決済み

Project Euler: Problem 10, Sum of Primes
The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17. Find the sum of all the primes below the input, N. Thank you <http:/...

4ヶ月前

解決済み

Project Euler: Problem 8, Find largest product in a large string of numbers
Find the greatest product of five consecutive digits in an n-digit number. 73167176531330624919225119674426574742355349194934...

4ヶ月前

解決済み

Project Euler: Problem 7, Nth prime
By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the Nth prime nu...

4ヶ月前

David K

Last seen: 4日 前

David K's バッジ

MATLAB Answers

Cody

Cody

Cody

Community

Cody

Cody

Cody

Cody

Cody

Cody

Cody

MATLAB Answers

Cody

1

1

0

1

Last seen: 4日前