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Matt J


Last seen: Today
7 131 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Change white pixels to invisible
Shouldn't you have alphachannel = 1-double(all(image == 255, 3));

ungefär 11 timmar ago | 0

Answered
Converting strings to operators
I can't tell if you really intend S to be a string vector because that dpesn't agree with the example you posted. If I assume it...

ungefär 12 timmar ago | 0

Answered
optimization problem of areas
Your objective function Area2 is written to be a function of z, but nothing in sum( ( x.*dt(m(1):c(1)) ) ) depnds on z. Perha...

ungefär 19 timmar ago | 0

| accepted

Answered
Fmincon gives relative maximum constraint violation but still gives output due to conflicting constraints.
For example, [tmp,fval,exitflag] = fmincon(Total_Profit,Guess,A,b,Aeq,beq,LB,UB,[],options); if exitflag>0 xopt(i,:...

en dag ago | 0

Answered
Calculate the midpoint of two lines on a track
The effectiveness of any solution we give will depend on whether the illumination levels of every frame will be similar to your ...

2 dagar ago | 0

Answered
Preallocation within an optimization loop
xopt=nan(runs,2); %Pre-allocate Total_Private_Profit=nan(runs,2); %Pre-allocate for i = ...

2 dagar ago | 0

| accepted

Answered
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...

3 dagar ago | 1

Answered
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...

3 dagar ago | 0

| accepted

Answered
How to plot the trajectory that fminsearch follows?
trajectory=doIt(); fcontour(@rosenbrock, [0 3 -3 3],'LineColor', '#00FFFF', 'MeshDensity',50,... ...

3 dagar ago | 1

| accepted

Answered
Sparse vs Least square solution differ at the edges
Because you forgot to transpose c, s2 = mldivide(full(c.'),b.').';

4 dagar ago | 0

| accepted

Answered
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...

4 dagar 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...

4 dagar ago | 1 answer | 0

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answer

Answered
Help 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...

4 dagar ago | 1

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Answered
Using blockproc to simply copy an array
Using sepblockfun from the file exchange, https://www.mathworks.com/matlabcentral/fileexchange/48089-separable-block-wise-opera...

5 dagar ago | 0

Answered
Random number generator with max and min values included in the matrix
I believe your code already works as written. Problem solved?

5 dagar ago | 0

Answered
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...

5 dagar 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...

6 dagar ago | 1 answer | 0

1

answer

Answered
fsolve 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...

7 dagar ago | 1

| accepted

Answered
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))) +... ...

8 dagar ago | 0

Answered
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...

8 dagar ago | 0

Answered
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...

8 dagar ago | 0

| accepted

Answered
show det(A) = det(A') ?
But it's not true! A=rand(200); isequal(det(A),det(A.'))

8 dagar ago | 0

Answered
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, ...

8 dagar ago | 0

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Answered
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...

8 dagar ago | 1

| accepted

Answered
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...

8 dagar ago | 0

| accepted

Answered
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 ...

9 dagar ago | 0

| accepted

Answered
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...

10 dagar ago | 0

Answered
Transform set of points into 2xN matrix
set1.'

10 dagar ago | 0

Answered
checking input an integer greater than 0?
validateattributes(yourInput,"numeric",{"integer","nonnegative"})

10 dagar ago | 0

Answered
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 ...

10 dagar ago | 0

| accepted

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