# Matt J

Professional Interests: medical image processing, optimization algorithms PLEASE NOTE: I do not read email sent through my author page. Please post questions about FEX submissions in their respective Comments section.

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**Content Feed**

How do I save for loop plots to a figure directory?

One possibility: saveas(gcf, fullfile(OutputFigures, "FIG"+i) );

ongeveer 7 uur ago | 0

| accepted

Why do I get different outputs for fsolve when I use different initial point?

Why do I get different outputs for fsolve when I use different initial point? Because you have local solutions. You need to cho...

ongeveer 16 uur ago | 0

Fminsearch for fitting models (unconstrained nonlinear minimization of rmse)

rmse= sqrt(sum((ydata-(c1./(1+exp(-a1-b1.*xdata))+c2./(1+exp(-a2-b2.*xdata))+d).^2))./numel(xdata));

ongeveer 17 uur ago | 0

How can I efficiently use an array of patterns to create figure titles?

One possibility: regNames = ["Anterior HPC" "Posterior HPC" "Amygdala" "Enthorinal Cortex" "Pararhinal cortex"]; pats = "u" + ...

2 dagen ago | 1

2D matrix transformation (Brown-Conrady distortion model) fitting

You can use lsqcurvefit if you have the Optimization Toolbox.

2 dagen ago | 0

Fzero giving weird answer

As you can see from the plot, the root lies quite close to solution, so fzero succeeded. If this violates your expectations, it ...

3 dagen ago | 0

Question

Why is it forbidden to call a superclass method from a subclass function of a different a name?

I tried the thing in the screenshot below, i.e, to call the super-class method getThis() within the sub-class method someFunc()....

3 dagen ago | 0 answers | 0

### 0

answersHow to find the line of intersection between the following two planes and plot the intersected line on the same two planes?

You can get the line of intersection in Dual Plucker Matrix form as follows: A=null([[P11;P21;P31],ones(3,1)]); %plane 1 B=...

3 dagen ago | 0

| accepted

Length of lower bounds is < length(x); filling in missing lower bounds with -Inf. Problem is unbounded

A=readtable('4times6249datacsv'); A=table2array(A); f=sum(A,2); Aeq =ones(1,4); beq = 1; lb = zeros(4,1) ; a = linpro...

3 dagen ago | 0

Maximization problem in MATLAB Optimisation Toolbox

Will it work same here? Yes. Example: fun=@(x) -x^2; %maximize this xmax=fmincon( @(x) -fun(x) , 1) It worked!! But anoth...

3 dagen ago | 1

| accepted

Given a quadrilateral image, not necessarily a rectangle, how to find its top left point's x-y coordinate

You can use pgonCorners from https://www.mathworks.com/matlabcentral/fileexchange/74181-find-vertices-in-image-of-convex-polygo...

3 dagen ago | 0

How to use Matlab Functions with Vector of Structures

m = min([struct.field1])

3 dagen ago | 0

| accepted

Defining objective functions appropriately

It depends what environment you are formulating the problem in. fmincon and fminunc will only minimize functions, so you cannot ...

3 dagen ago | 0

| accepted

Question

Isn't it dangerous to allow Comma-Separated-List functionality in indexed assignments?

I have a function below called renamefields() which, as the name suggests, renames a desired subset of struct array fields as de...

4 dagen ago | 1 answer | 0

### 1

answerHow to get comlex root of an equation using fminbnd?

fminbnd is for minimzing over a 1D interval. It's not clear to me how you are defining 1D interval bounds for a number that does...

4 dagen ago | 0

Issues in the constraint functions of the Optimization Problem solving

function [c,ceq]= area(x0) M=5; % x0=[5,8]; M2=m(M,x0(1)); M3=m(M2,x0(2)); M4=m(M3,(x0(1)+x0(2))); beta1=b(M,(x0(1)))...

5 dagen ago | 0

collapsing rows of a cell array into a single cell

Data2=num2cell(Data,1); However, I wonder why you would want to do this. Matrices are usually faster to manipulate than cells, ...

5 dagen ago | 0

| accepted

Question

How many columns can the input to the JacobianMultiplyFcn have?

I am using the JacobianMultiplyFcn option of lsqnonlin. The documentation says that JacobianMultiplyFcn is to be a handle to a f...

5 dagen ago | 1 answer | 0

### 1

answerfsolve with two variables in a loop

fun=@(z)[fx(z(1),T(j));fy(z(2),T(j))];

6 dagen ago | 0

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Receiverd Signal and optimization

w=(hr'*Theta*G +hd')'; w=sqrt(P)*w/norm(w);

6 dagen ago | 0

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Split one table into multiple tables based on multiple variables without reordering.

T=readtable('Data - 2023-01-26_question'); G=findgroups(T(:,1:2)); I=(1:numel(G))'; splitTables = splitapply(@(i){T(i,:)}...

7 dagen ago | 0

| accepted

Upper bound curve that passes through the extreme (highest) points

load D_by_t_u; load surge_height_1m; final_mat = []; for i = 1:length(surhe_height_1m) if surhe_height_1m(i) > 0.02 ...

7 dagen ago | 0

| accepted

How do I multiply the numbers in a 2D array using a for loop, must be a for loop as part of the course requirements

One way: A3=nan(size(B)); for i=1:size(B,2) A3(:,i)=sind(B(:,i)).^2; end

7 dagen ago | 0

| accepted

How to solve "Conversion to logical from optim.problemdef.OptimizationEquality is not possible." ?

This will solve the "Conversion to logical" error, but not all of the other issues raised by Torsten and me. In particular, Gene...

7 dagen ago | 0

| accepted

How to simplify too much of if

FP=[39 45 33 36 27 30, 29,33,24,28,20,24,... 41 46 34,38,29,32,32,36,25,30,22,25,36,49,38,41,31,34,35,39,.... 29,32,24...

7 dagen ago | 0

Why DerivativeCheck would be allowed to be on while there is no GradObj?

Here's a reason why you might want to allow DerivativeCheck to be on even when the analytical gradient computations are all off....

7 dagen ago | 0

| accepted

Why DerivativeCheck would be allowed to be on while there is no GradObj?

So why would MATLAB allow the DerivativeCheck to be on if there is no gradient available? Because maybe SpecifyConstraintGradie...

8 dagen ago | 0

Effect of zero padding on FFT amplitude

@Rahul Kale It occurs to me now that you are not really trying to compute the Fourier transform of a finite signal. You are inst...

8 dagen ago | 0

| accepted