elias GR

Last seen: 4 months ago | Active since 2012

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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...

7 years ago | 3

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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...

8 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));

8 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') ...

8 years ago | 0

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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]

8 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...

8 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(:,:,...

8 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...

8 years ago | 0

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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; ...

8 years ago | 0

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

8 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.

8 years ago | 1 | 67 solvers

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...

8 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...

8 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...

8 years ago

Solved

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

8 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...

8 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 ...

8 years ago | 0 | 30 solvers

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 ...

8 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...

8 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...

8 years ago

Solved

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

8 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]

8 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.

8 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...

8 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...

8 years ago | 0

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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...

13 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...

13 years ago | 4 | 476 solvers

Solved

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

13 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.

13 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];

13 years ago

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