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David Hill


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2.917 total contributions since 2017

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Answered
sum of row in pattern
k=unique(Data(:,1:2)); y=zeros(length(k),2); for m=1:length(k) y(m,:)=[k(m),sum(Data(logical(ismember(Data(:,1),k(m))+ism...

circa 4 ore ago | 0

Solved


Determine digits of the Copeland-Erdos constant
<https://www.mathworks.com/matlabcentral/cody/problems/1477-champernowne-constant/solutions/new Cody Problem 1477> asks us to de...

circa 4 ore ago

Solved


Cumulative difference
Given an array, return the cumulative difference. Example a = [ 1 3 5 7 ] cumdiff = [ 1 2 1 -2 ]

circa 5 ore ago

Solved


Find index of a string in a cell array
Write a function that finds the index at which the cell array of strings C contains the exact string S. So if C = {'twe...

circa 6 ore ago

Solved


basic matrix operations: rotate and find sum of diagonal elements of the resultant matrix
For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals. Example: Input: a = 1 ...

circa 6 ore ago

Solved


Basic Addition

circa 7 ore ago

Solved


S-T-R-E-T-C-H I-T O-U-T
You will be given a row of numbers (x), and a single number (n). Your job is to write a script that will stretch out the row of...

1 giorno ago

Solved


Given a number N, find the smallest prime P>N
Given a number N, find the smallest prime P greater than N. For example: If N=10 then P=11. If N=13 then P=17.

1 giorno ago

Solved


Weave two matrices together to form one matrix
Take the first column from matrix a, then insert the first column from matrix b, and so on. For example: a = [1 2 3 4]; b ...

1 giorno ago

Solved


Make a Plot with Functions
Make a plot and test

1 giorno ago

Solved


means
Calculate the arithmetic, the geometric and the harmonic mean of a given vector (with positive elements) and return them in a ve...

1 giorno ago

Solved


Toeplitz Matrix
For a given square matrix of order n-by-n check whether this is a Toeplitz matrix or not. Return true if it is.

1 giorno ago

Solved


User defined nextpow function
Create a function which will take 2 arguments as n and x, and return y, where, n^y >= abs(x). [ Similar to builtin "nextpow2" fu...

1 giorno ago

Solved


how many of the entries are positive?
Given x= sin(linspace(0,10*pi,100)), how many of the entries are positive?

1 giorno ago

Answered
arg min for Optimization problem
norm(X-A.*w-B.*v,-inv);%I assume you want element wise multiplication

1 giorno ago | 0

Answered
How to get part of 2D array from a 2D array. (i.e. 4x4 array to 2x2x4)
A=reshape([a(1:2,:),a(3:4,:)],2,2,4);

2 giorni ago | 0

Solved


Calculate the h-index
H-index is a powerful tool for quantifying the scientific contribution of a researcher. H-index is defined as follows (source - ...

2 giorni ago

Solved


Calculator spelling - Numbers to Letters
Using the numbers on a calculator, and rotating the display 180 degrees, many words can be spelled. In particular, the following...

2 giorni ago

Solved


Leftovers? Again?!
I am thinking of a positive number X. To determine what number I am thinking of, I will give you two 1xN vectors. The first ve...

2 giorni ago

Solved


My Problem, Find the square of the horizontal concatenation of the third and fifth elements of a vector.
given the 1x5 vector x, y must be the square of the horizontal concatenation of the third and fifth elements. So, if x = [1 1 1 ...

2 giorni ago

Solved


Pattern Sum
Write a function which receives two single digit positive integers, (k and m) as parameters and calculates the total sum as: k...

2 giorni ago

Solved


Electric Flux
Calculate the flux passing through a surface. E is electric field, A is area.

2 giorni ago

Solved


number of groups
In a classroom, *n* students work on a special project and the other students work in groups of five. If there are 18 students i...

2 giorni ago

Solved


first step for Huffman Coding (easy)
Given a string, you must sort the characters by occurrence (from lowest to highest). This step is necessary to generate a Huf...

3 giorni ago

Solved


Guess
A random number between 1 and 10 is created for the variable y. Guess what its value is.

3 giorni ago

Solved


Divide the Least Common Multiple by the Greatest Common Divisor of two numbers
Divide the Least Common Multiple by the Greatest Common Divisor of two numbers. For example, for x=12345 and y=54321, the answer...

3 giorni ago

Solved


Insert Special character in character cell array.
input={'a','b','c'} then ans={'a','*','b','*','c'}

3 giorni ago

Solved


Deleting Specific part.
if input is x= { /*[0..10]*/ 0, 11, 21, 31, 41, 55, 50, 10, 810, 9.10, /*[10...25]*/ 100, 110, 120, 130, 140, 255 ...

3 giorni ago

Solved


Replace Negative(-) by 0 and positive by 1
In a given Matrix Replace all element having *Negative sign with 0* and *Positive elements with 1* .

3 giorni ago

Solved


Help the Patriots get to the Super Bowl
Given a football by the Patriots, return it to them with 2 psi less air in it. (The original psi is passed as a number to the...

3 giorni ago

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