Community Profile

photo

David Fletcher


De Montfort University

179 total contributions since 2018

David Fletcher's Badges

  • 3 Month Streak
  • Knowledgeable Level 3
  • First Answer
  • CUP Challenge Master
  • Solver

View details...

Contributions in
View by

Answered
Explanation of num2str(x) - '0'
num2str(x) - this converts the number to a string Once converted subtracting '0' subtracts the character code for 0 from all ...

12 months ago | 0

Answered
How do I display list of folder (as text file)
files=dir sprintf('%s \n',files.name) fName=input('choose file:','s')

12 months ago | 1

| accepted

Answered
How to delete columns if there is'nt enough data?
prunedData = rmmissing(dataMatrix,2,'MinNumMissing',13)

12 months ago | 0

Answered
How to add a small random number to all values in a matrix
testMatrix=[1 2 3;4 5 6;7 8 9] noise=(rand(size(testMatrix,1),size(testMatrix,2))-0.5)./5 testMatrix=testMatrix-nois...

12 months ago | 1

| accepted

Solved


Roll the Dice!
*Description* Return two random integers between 1 and 6, inclusive, to simulate rolling 2 dice. *Example* [x1,x2] =...

12 months 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...

12 months ago

Solved


Swap the input arguments
Write a two-input, two-output function that swaps its two input arguments. For example: [q,r] = swap(5,10) returns q = ...

12 months ago

Solved


Too mean-spirited
Find the mean of each consecutive pair of numbers in the input row vector. For example, x=[1 2 3] ----> y = [1.5 2.5] x=[1...

12 months ago

Solved


Bottles of beer
Given an input number representing the number of bottles of beer on the wall, output how many are left if you take one down and ...

12 months ago

Solved


How to find the position of an element in a vector without using the find function
Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for. Examples: fin...

12 months ago

Answered
Legend title only without marker and lines of data
Looks like the text position is consistently in the upper right (irrespective of range scale values) to me, but if you say you'v...

12 months ago | 0

| accepted

Answered
How do i make different matrices run through the same code?
If your 2D matrices are of the same dimension they can be combined into a single 3D matrix: D(:,:,1)=matrixA D(:,:,2)=ma...

1 year ago | 0

| accepted

Solved


Find the longest sequence of 1's in a binary sequence.
Given a string such as s = '011110010000000100010111' find the length of the longest string of consecutive 1's. In this examp...

1 year 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...

1 year ago

Answered
Finding how mych values contain a specific number in a matrix
Whilst I can admire the brevity of Walter's code, I might be inclined to use a more 'conventional' alternative A=rand(100...

1 year ago | 0

Solved


Sort a list of complex numbers based on far they are from the origin.
Given a list of complex numbers z, return a list zSorted such that the numbers that are farthest from the origin (0+0i) appear f...

1 year ago

Answered
How would i store data into a vector
numElements=10; %Create 1x10 row vector filled with zeros rowVector=zeros(1,numElements) %Create 1x10 column vect...

1 year ago | 0

| accepted

Answered
Can I change the loop size inside the loop?
For loop conditions are set upon entering the loop and the only form of modification that can be made is to 'break' out of the l...

1 year ago | 0

Answered
How can I write log(e) in MATLAB?
I assume you mean log10? In Matlab log is base e, so log(e)=1 x=log10(exp(1))

1 year ago | 1

| accepted

Answered
"Function definitions are not permitted in this context."
If you have a function in a script (allowed from R2016 onwards I think), it must go at the end, after all the script code

1 year ago | 0

Answered
All possible pairs in a vector
nchoosek(A,2)

1 year ago | 0

Answered
Matrix indexing - Picking columns
Do you mean this instead of your 1:5:end? 5:5:end If you explicitly also want column 1 the you could use [1 5:5:end]

1 year ago | 1

| accepted

Answered
How to run the code?
From the overview given by your link, the main function is: function [digest, MSG_PADDED] = image_hash(V_LEN,H_LEN,METH,IMG...

1 year ago | 0

| accepted

Answered
Function that pulls a name from a list at random but doesn't repeat
listNames={'a','b','c','d','e','f','g','n','h'} for iter=1:9 name=pick_name(listNames) end functio...

1 year ago | 0

| accepted

Answered
How to find a location of a specific value inside a matrices that is 26x7x101 of length
[~,loc]=ismember(matrixName,value) [i,j,k]=ind2sub([26,7,101],find(loc,1)) The above will find the first specified...

1 year ago | 1

| accepted

Answered
How do I print the common elements in a row vector?
use the logical vector to index the common values common=A(ismember(A,B)) if you have multiple values in A that are the ...

1 year ago | 0

Answered
Check values under a certain threshold with an undefined window
A=[9 10 47 50 49 48 2 46]; mymax=max(A); % in this case mymax=50 mincondition=mymax*0.9; % mincondition=45 indexe...

1 year ago | 0

| accepted

Answered
How to process a subset of a matrix
matrixName(2,:)=matrixName(2,:)/2

1 year ago | 0

| accepted

Answered
Re-generate random matrix
ind=randperm(81) B=reshape(A(ind),9,9)

1 year ago | 3

| accepted

Answered
Replacing values in a table
tab = 10×2 table C1 C2 __ ___________ 1 -32768 2 ...

1 year ago | 1

Load more