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David Fletcher


De Montfort University

179 total contributions since 2018

David Fletcher's Badges

  • 3 Month Streak
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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 ...

2 years 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')

2 years ago | 1

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

2 years 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...

2 years ago | 1

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Solved


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

2 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...

2 years 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 = ...

2 years 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...

2 years 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 ...

2 years 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...

2 years 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...

2 years ago | 0

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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...

2 years ago | 0

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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...

2 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...

2 years 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...

2 years 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...

2 years 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...

2 years ago | 0

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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...

2 years 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))

2 years ago | 1

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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

2 years ago | 0

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

2 years 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]

2 years ago | 1

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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...

2 years ago | 0

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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...

2 years ago | 0

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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...

2 years ago | 1

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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 ...

2 years 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...

2 years ago | 0

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

2 years ago | 0

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

2 years ago | 3

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

2 years ago | 1

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