Matt J
Last seen: Today
7,126 total contributions since 2009Professional Interests: medical image processing, optimization algorithms
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orthagonal planes and normal vectors
format long; A=normalize( [3,2,-1; 3,-8,-7;-22,18,-30] ,2,'norm'); If they are orthogonal, this should give the identity matr...
1 day ago | 1
Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.699518e-25.
If C is singular, then C is singular and that's all there is to it. However, this will make the same inversion slightly less sin...
1 day ago | 0
How to plot the trajectory that fminsearch follows?
trajectory=doIt(); fcontour(@rosenbrock, [0 3 -3 3],'LineColor', '#00FFFF', 'MeshDensity',50,... ...
1 day ago | 1
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Sparse vs Least square solution differ at the edges
Because you forgot to transpose c, s2 = mldivide(full(c.'),b.').';
1 day ago | 0
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Drawing upon general, user-created mfiles and .mat files for the Answers forum RUN feature
Here is a test of the technique using an attached mfunction. websave('testfunction', 'https://www.mathworks.com/matlabcentral/a...
2 days ago | 0
Question
Drawing upon general, user-created mfiles and .mat files for the Answers forum RUN feature
Thanks to brilliant advice from Ameer Hamza, I have found a way to draw upon URL-posted .mat files as input to the Matlab Answer...
2 days ago | 1 answer | 0
1
answerHelp me how to find the base of the intersection of two subspaces
If the vectors form the columns of a matrix A and the vectors form the columns of a matrix B, then the basis of the intersecti...
2 days ago | 1
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Using blockproc to simply copy an array
Using sepblockfun from the file exchange, https://www.mathworks.com/matlabcentral/fileexchange/48089-separable-block-wise-opera...
2 days ago | 0
Random number generator with max and min values included in the matrix
I believe your code already works as written. Problem solved?
2 days ago | 0
Optimize model parameters given minimum sum of error square
It does not make sense that there are randomization operations like normrnd in your objective function. How can a function be "m...
2 days ago | 0
Question
Save and load alternative sets of preferences
I know how to set Preferences in Matlab through GUI buttons, however, suppose I have different sets of preferences that I wou...
4 days ago | 1 answer | 0
1
answerfsolve with one variabel
I don't understand why you would be using Symbolic Math Toolbox variables, syms x unless you were planning to use solve, Tinc...
5 days ago | 1
| accepted
curve fitting with dependencies between the coefficients
Re-express your model function as, sin(d1)^2*(1-exp(-a1*(t^n1))) + cos(d1)^2*sin(d2)^2*(1-exp(-a2*(t^n2))) +... ...
5 days ago | 0
What happens if I use parfor and the fmincon/fminunc option "UseParallel" together?
I don't know the answer to that directly, but it is easy to show by example that turning off 'UseParallel' can be beneficial: o...
6 days ago | 0
fmincon Constraint Query Optimization
Generally, all constraints must operate on the total set of unknows x1,..x10. However, given A1,A2, b1,b2 it is simple enough to...
6 days ago | 0
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show det(A) = det(A') ?
But it's not true! A=rand(200); isequal(det(A),det(A.'))
6 days ago | 0
Optimization problem on Constraint declaration
We can't tell from your code what the relation is supposed to be between a, wd and x. This might be what you were trying to do, ...
6 days ago | 0
| accepted
How to use for loop to set properties' attributes in MATLAB class?
You cannot put a for loop or other complex code inside a properties block. If you wish, you can set a default value for a proper...
6 days ago | 1
| accepted
Using the given code, how can I optimize a matrix to minimize a cost function?
Well, the way you would approach it is using fmincon as below. Using your initial guess of zeros(N,M), fmincon is unable to find...
6 days ago | 0
| accepted
How to input dependent parameters in matlab function?
These two, out = myfun(A,B,optionC,dependent_C1) out = myfun(A,B,optionC,dependent_C2) are not possible simultaneously. If ...
7 days ago | 0
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fmincon - Converged to an infeasible point.
The max() operations in your constraints disqualify fmincon as a valid tool for this problem - the constraint functions are assu...
7 days ago | 0
checking input an integer greater than 0?
validateattributes(yourInput,"numeric",{"integer","nonnegative"})
7 days ago | 0
Why do the ylabel renderings look different when Property Inspector says they are the same?
I figured it out. The syntax for the second plot needed to be, ylabel('Local Deviation (\%)','Interpreter','latex') ; %percent ...
8 days ago | 0
| accepted
How to solve Ax=b where A is a rectangular matrix for higher order in matlab
x=A\b
8 days ago | 2
| accepted
Question
Why do the ylabel renderings look different when Property Inspector says they are the same?
The image below is a screenshot of two different y-axis labels that I have in two different figure windows, generated in R2020a....
8 days ago | 2 answers | 0
2
answersQuestion
How to load a .mat file from a URL
I find that I cannot load a .mat file from a URL. For example, when I try to call load() with the full URL of the attached .mat ...
9 days ago | 1 answer | 1
1
answerProblems about "rotate" function
Presumably because b(end) is the perimeter, i.e., it is a polyshape containing almost no internal area.
9 days ago | 0
| accepted
Why am I getting 'NaN' values in my vector?
I don't understand the instructions, but maybe this is what it means: x(i+18+1) = mod( x(i+7+1) + x(i+1), 2); y(i+18+...
9 days ago | 0
fmincon nonlinear inequality constraints
function [c, ceq] = nlcon(p) c = p(4)-exp(p(1)-p(2).*p(3).^log(1./2.7)) -35 ; ceq =[ ]; end
9 days ago | 0
| accepted
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