Answered
How to fix my linear fit model?
Assuming you know where to split the data for left and right lines: x = [0 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 ......

1 year ago | 1

| accepted

Answered
How to fix my linear fit model?
This returns the piecewise linear function that is continuous at the break point. The correct break point is close to 18.6054 a...

1 year ago | 1

Answered
strcmp gives a 0 while it should be a 1
Look more carefully: There is a 'c' before '49' in A but not in B

1 year ago | 0

| accepted

Answered
Basic FFT Question: What range to sample the function in.
" However I am under the impression that the fft should not be sensitive to this change. " Your expectation in incorrect When y...

1 year ago | 0

| accepted

Answered
getfield to get values from an entire struct array?
Create 1 x 3 struct array with field named 'afield' s = struct('afield', {11 12 13}) s(1) s(2) s(3) % Here is the command t...

1 year ago | 0

| accepted

Answered
express basis spline derivative in terms of interpolation values
x = [1 2 3 4 5]; y = randn(size(x)); k = 5; f = spapi(k,x,y); B = spapi(k,x,eye(length(x))); fdd = fnder(f, 2); Bdd = ...

1 year ago | 0

| accepted

Answered
Use MATLAB Coder to convert matlab code to mex without using multi-threading
https://www.mathworks.com/help/coder/ug/use-parallel-for-loops.html

1 year ago | 0

Answered
How to get all possible combination With the total number of possible combination for "n" variables that can take different values
Checkout similar thread https://www.mathworks.com/matlabcentral/answers/476022-how-to-pick-up-all-combination-of-numbers-from-m...

1 year ago | 0

| accepted

Answered
Possible issues with solving iterative linear systems with mldivide
"Is there a way to see the matrix solver steps to see which expressions might have an issue?" No they are LAPACK/BLAS based cod...

1 year ago | 0

Answered
Sparse matrix vector product returns null.
"What can cause this issue?" Nothing. What you claim likely would not happen. Unless if you show an example.

1 year ago | 0

| accepted

Answered
How to define if/else non linear constraint in an optimization problem
Simply solve three different optimization pbs with the three repectively constraints independently and ignore the two other, the...

1 year ago | 1

Answered
How to use loop to fill in specific numbers?
T = combinations(1:4,1:8) % for alder release that does not support combinations [v1 v2] = meshgrid(1:4,1:8); v1 = v1(:); ...

1 year ago | 0

Answered
Error With Least Squares Approximation
Few other recommendations beside what Torsen and John altrady told you: Lower the polynomial order, do not go above 7, But you ...

1 year ago | 0

Question


ANY and ALL with NaN array
According to any documentation page, it " determines if any element is a nonzero number". OK to me NaN is nonzero number so I do...

1 year ago | 1 answer | 0

1

answer

Answered
Make histogram from multiple cells.
% Generate dummy test data C=arrayfun(@(varargin)randn(5+randi(20),24), 1:30, 'unif', 0); A=cell2mat(C(:)); % m x 24, like c...

1 year ago | 0

| accepted

Answered
My First Derivative is not correctly calculated in matlab
syms yApprox(X1) a0 a1 a2 a3 a4 a5 a6 yApprox = a0 + a1.*X1 + a2.*(X1).^2 + a3.*(X1).^3+ a4.*(X1).^4 + a5.*(X1).^5 + a6.*(X1).^...

1 year ago | 0

| accepted

Answered
for loop vectorization of De Boor algorithm
Old question, but I'll reply it for future readers that wonder how to tackle the same problem. I did a quick and dirdty vectori...

1 year ago | 0

Answered
Increase plot speed in MATLAB
Try to look at animatedline command Also look at drawnow with or without limitedrate option, it somewhat has certain effect, ev...

1 year ago | 0

| accepted

Answered
Error calculating inverse for matrix block of LU decomposition of a full row rank matrix
It's a little bit perturbant, but reading the lu doc I don't see why U1 must have the same rank than U (or A, meaning 100 on you...

1 year ago | 0

| accepted

Answered
de boor bspline algorithm
A very late answer, but as I deal myself with de Boor algorithm I look what exists out there. If the question concerns the 3D a...

1 year ago | 0

Answered
For a repeated eigenvalue only one eigenvctor is being returned
Indeed in case of eigenvalue with multiplicity > 1; the problemie is numerical challenging and MATLAB might fail to find the cor...

1 year ago | 0

Answered
How "chol" and "qz" MATLAB algorithms are utilised in the "eig" MATLAB function?
See stage 3 described in https://netlib.org/lapack/lug/node56.html or somewhere in this file

1 year ago | 0

| accepted

Answered
steps to convert spline from B-form to pp-form (fn2fm)
The pp-form stores the polynomial of each each subiterval, the variable is x := (t-ti) where ti is the left knot of interval #i....

1 year ago | 0

| accepted

Answered
How to extract a matrix of values from cell array of cell arrays of structs
Generate data (Thanks Voss) n1 = 3; n2 = 4; mse = cell(1,n1); for ii = 1:n1 mse{ii} = cell(1,n2); % row vector for...

1 year ago | 0

| accepted

Answered
Where is dlfeval tracing information stored?
I don't kwow the dlarray class but IMO it looks like the creating function handle f is stored in some sort of private property i...

2 years ago | 0

Question


Default rank revealing tolerance
In few MATLAB functions such as RANK, PINV, ORTH there is a parameter TOL. MATLAB uses the default value as % tol = max(size(A...

2 years ago | 0 answers | 1

0

answers

Answered
plot() and fplot() give different results for the same function
Your coding is wrong: Replace "/" with "./"

2 years ago | 0

| accepted

Answered
getting warning while using eigs on the matrices obtained from freefem++
Try to follow the suggestion you get " Consider specifying a perturbed numeric sigma value to improve the condition of the matri...

2 years ago | 0

Answered
cubic spline interpolation - mixed boundary conditions possible?
In principle yes. The spline on the second segment (b,c) are piecewise cubic poynomials; starting from b sequentially to each in...

2 years ago | 0

| accepted

Answered
How to convert /map uint16 to int16 maintaining the dynamic range so that [0] and [2^16-1] in uint16 beomes [-2^15] and [2^15-1] without going through double
If you have C compiler this simple mex file will do the job: /*****************************************************************...

2 years ago | 1

Load more