Beantwortet
Adding members to a matrix changes other members in the matrix
It is simply the display on screen that scale the data to largest value. The data is untouched interally.

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
Smoothing/splining data with a limit to the slope of the smooth fit
Using this File Exchange, its is not easy to find a combination of parameters to make it "works". I think it is difficult and th...

fast 4 Jahre vor | 0

Beantwortet
How can I compute the Area and the Centroid of the following shape?
xA = 0; xB = 1; a = 9.2; c = 0.5; sfun = @(x)sigmf(x, [a c]); Area = integral(@(x)sfun(x),xA,xB); xc = integral(@(x)...

fast 4 Jahre vor | 2

Beantwortet
Minimizing an equation to 0
This minimize the frobenius norm, or l2 norm of the vectorized residual matrix (divided by sqrt(numel(A)) you'll get the rms) k...

fast 4 Jahre vor | 0

Beantwortet
Why ''int'' and ''integral'' return different answers
I think the problem is more subttle than the simple presence of singularities. Some "mild" singularity can be handlle correctly ...

fast 4 Jahre vor | 0

Beantwortet
How do I plot this set as 3d region in matlab?
Code that plot ALL the boundaries of the domain x = 0; y = 0; c = 1+x^2+y^2; f1 = @(u,v,z) z - (u.^2 + v.^2 + c); f2 = @(...

fast 4 Jahre vor | 2

Beantwortet
Randomise vector numbers to maximum variance
A = repmat([10 repmat([repmat(0, 1, 2), 1 repmat(0, 1, 2)], 1, 5)], 1, 20);

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
How od i generate random numbers whose sum is constant?
If the numbers are supposed to be >= 0 with precribed sum, a simple method is n = 100; s = 10; Y = -log(rand(1,n)); X = s ...

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
How od i generate random numbers whose sum is constant?
Check this out https://uk.mathworks.com/matlabcentral/fileexchange/9700-random-vectors-with-fixed-sum

fast 4 Jahre vor | 1

Beantwortet
isqnonlin: compute part of objective function outside of matlab
"The gradient vector of the objective function res with respect to the parameters p is calculated like this: d(res)/d(p) = 2*(s...

fast 4 Jahre vor | 0

Beantwortet
What is the best function of the following shape?
Try this: xmin = 1; xmax = 3; pp = struct('form','pp',... 'breaks',[-1e-100 0 1 inf],... 'coefs',[0 0 0 0 0 0;6,-...

fast 4 Jahre vor | 2

Beantwortet
need general coding/ command to separate matrix data
Try this: % Fake data finalmatrix=sortrows(randi(10,30,3),1) y = finalmatrix(:,1); n=diff(find([true; diff(y)~=0; true])) ...

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
Replacing Arrays and Matrices
IMO nothing hurts of using same variable name for different things. But my experience tell me that is a bad habit of programmin...

fast 4 Jahre vor | 1

Beantwortet
where the jump of the phase function happen?
angle(z) is discontinue at the half line { y=0; x<=0, z=x+1i*y }. The phase jumps from -pi for imaginary part y < 0 to +pi for ...

fast 4 Jahre vor | 0

Beantwortet
How can I integrate a function related to the modified bessel function of the first kind?
You can also "vectorize" distribution_func by applying arrayfun beta = 5 ; sigma = 1.4/3; integ_func = @(theta,x) x./sigma.^2...

fast 4 Jahre vor | 1

| akzeptiert

Beantwortet
adding counts of ordered pairs
A1=[1 4 3; 3 5 1; 12 4 7; 13 5 2; 14 1 1]; A2=[1 5 1; 13 5 1; 13 7 3; 14 1 5]; A12=[A1; A...

fast 4 Jahre vor | 1

Beantwortet
How to simulate Poisson Distribution Process?
Another way based on exponetial distribution, which is the time between 2 events % Generate n random integers follow Poisson wi...

fast 4 Jahre vor | 0

Beantwortet
Parallel rank calculation for sparse matrices -- suggestions?
For thin and tall sparse matrix A of size (m x n), m>>n and n in the order of 1000s, it might be possible to compute the rank us...

fast 4 Jahre vor | 0

Beantwortet
How to simulate Poisson Distribution Process?
If you don't have staistics toolbox % Generate n random integers follow Poisson with parameter (==mean) lambda lambda=3; n =...

fast 4 Jahre vor | 1

Beantwortet
Fitting a monotonically increasing spline function
One way is to use my https://uk.mathworks.com/matlabcentral/fileexchange/25872-free-knot-spline-approximation x = [0., 0.75, ...

fast 4 Jahre vor | 2

| akzeptiert

Beantwortet
How to constrain the resulting equation from a polynomial surface fit to a positive range?
This is implementation of Torsen's idea data=readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1116665...

fast 4 Jahre vor | 0

Beantwortet
Using linprog but it's only returning 'Optimal solution found' with no feasible solution?
It looks solution is correct to me. Note that the Aeq = [] meaning you don"t supply equality constraint, so I need to check for...

fast 4 Jahre vor | 0

Beantwortet
Error in finding the angle between three points using atan2
142.9 degree seem right to be. If you don't make the same aspect ratio of x and y with axis equal, angles are deformed on your s...

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
linear independent set formation
t = rand(1,7)*2*pi; independent = rank(cos((0:6)'.*t)) == 7

fast 4 Jahre vor | 1

| akzeptiert

Beantwortet
Find all paths in a graph with distance, previous nodes
It is not clear what you want to achieve but you might take a look at this function https://uk.mathworks.com/help/matlab/ref/gr...

fast 4 Jahre vor | 0

Beantwortet
Interpolating Missing Data with Noise like Brownian Motion
"What might be the best way to do this?'" Interpolation THEN adding noise. There is no reason to mix the noise generation wit...

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
Rotating a point cloud fails
The last index of this line should be 3 V = rotation_mat*[V1(:,1) V1(:,2) V1(:,2)]'

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
Find the intersection of two lines with multiple intersections.
% Basic Variables k_prime = 1000; np = .85; P = 750; rho = 1.225; S = 25; W = 1600*25; Cl_max = 1.5; k = .05; Cdo = .025; Cd =...

fast 4 Jahre vor | 0

Beantwortet
Intersection of two parametric circles in R3
Please try this : % Generate fake data xyz1 = rand(3,1); xyz2 = rand(3,1); xyz = rand(3,1) dxyz1 = xyz1-xyz; ab = dxyz1(...

fast 4 Jahre vor | 0

Beantwortet
I don't understand the behavior of discretize
The doc saids "discretize divides the data into N bins of uniform width, choosing the bin edges to be "nice" numbers that overl...

fast 4 Jahre vor | 0