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elias GR


63 total contributions since 2012

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Answered
How to get the the arrow length as legend in quiver function ?????
I had the same problem. I finally used the following workaround: 'hold on' the figure and use the 'quiver' command again in orde...

2 years ago | 1

| accepted

Solved


Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

3 years ago

Answered
How to speed up a for loop ?
If A have 3 rows and n columns, try that: angle=asin(A(3,:))./(sqrt(A(3,:).^2+A(2,:).^2+A(1,:).^2));

3 years ago | 0

Answered
Hello, I have been trying to surf two parallel circles but data dimensions don't match and I don't know why. Any help would be nice. Thank you, Omar
Furthermore, surf is not the right command to do what you want. Try the following instead: fill3(X(1,:),Y(1,:),Z(1,:),'r') ...

3 years ago | 0

| accepted

Answered
Hello, I have been trying to surf two parallel circles but data dimensions don't match and I don't know why. Any help would be nice. Thank you, Omar
Erase Z=[Z;Z]; This is not needed because X already have 2 rows and size(X)=[2 100]

3 years ago | 0

Answered
Solving Poisson type of equation, increasing tolerance requirement leads to no response
The solution does not converge. It does not converge even with the 10-5 tolerance. You should print the max variable at each ste...

3 years ago | 0

Answered
transform matrices into a single matrix?
Make a 3D matrix. If your 6x6 matrices are in the variables A1,A2,...,A20, then: A=zeros(6,6,20); A(:,:,1)=A1; A(:,:,...

3 years ago | 0

Answered
How do I store output from double for loops, I only get the last iteration?
flygplatsmetar = cell(1,length(Data)); %initialize your 1D cell array for l = 1:length(Data) ... flygplatsmetar...

3 years ago | 0

Answered
How to assign two values randomly among 2 variables?
r=rand; %random number between 0 and 1 if r<0.5 sensor1 = c1; sensor2 = c2; else sensor1 = c2; ...

3 years ago | 0

Solved


radius of a spherical planet
you just measured its surface area, that is the input.

3 years ago

Problem


Maximum of ND-array
Find the maximum element of a N dimensional array. Example: A=[1 2 4 ; -20 4 10]; The maximum is 10.

3 years ago | 0

Answered
How to colour some node in a graph
Take a look here <https://www.mathworks.com/help/matlab/ref/plot.html?searchHighlight=plot#inputarg_LineSpec> You can give als...

3 years ago | 0

Answered
How to remove a pattern in a table column
strfind function is what you need ( <https://www.mathworks.com/help/matlab/ref/strfind.html> ). I suppose that you have a cell a...

3 years ago | 0

Solved


Convert a vector to a lower triangular matrix
I now have a row vector and I want to convert it to a lower trilangular matrix. The rows of the lower trilangular matrix have...

3 years ago

Solved


Number of primes
Count the number of primes less than 'n'.

3 years ago

Solved


Simple polynomial evaluation
Compute the value of a polynomial of degree n with all coefficients '1', at value x. n is always n>=0. p(x)=1+x+x^2+...+x^n...

3 years ago

Problem


Sum of digits of 2^n number
Given n, find the *cumulative* sum of the digits of the number 2^n (where n>=0). Example: Input n = 7 Output sum = 2 ...

3 years ago | 0

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 ...

3 years ago

Solved


Nearest Numbers
Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...

3 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...

3 years ago

Solved


Circle area using pi
Given a circle's radius, compute the circle's area. Use the built-in mathematical constant pi.

3 years ago

Solved


Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

3 years ago

Solved


Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

3 years ago

Answered
Error calculation and using for loop
# You need to put your code inside a function, in order x and n to be parameters. # You can estimate the true value by just us...

3 years ago | 0

Answered
trying with bisection method to create a function that finds the root of an equation, approximated error, and numbers of iteration
A first problem in your code is that the returned variable "root" does not always take a value. A second one is the "i= i+1;". i...

3 years ago | 0

| accepted

Solved


Numbers with prime factors 2, 3 and 5.
Make a function which takes one positive integer n and returns a matrix with the numbers of the form (2^i)*(3^j)*(5^k) which are...

8 years ago

Problem


Numbers with prime factors 2, 3 and 5.
Make a function which takes one positive integer n and returns a matrix with the numbers of the form (2^i)*(3^j)*(5^k) which are...

8 years ago | 1

Solved


First N Perfect Squares
*Description* Return the first N perfect squares *Example* input = 4; output = [ 1 4 9 16 ];

8 years ago

Solved


Cannon Ball
Given g (acceleration due to gravity) and desired altitude x, find the minimum ground velocity of a cannon ball to reach x.

8 years ago

Solved


Tell me the slope
Tell me the slope, given a vector with horizontal run first and vertical rise next. Example input: x = [10 2];

8 years ago

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