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Matt J


Last seen: Today
6.622 total contributions since 2009

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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Answered
How to display fmincon output outside the command windows ? (Deported output)
The way to gain access to status information during the execution of fmincon is by using the OutputFcn option, https://www.math...

alrededor de 19 horas ago | 0

Answered
How to create a cell array with the content of a component of a structure?
It is not working because in your for-loop, yourcell is never indexed by the loop variable i, so the loop code has no idea where...

1 día ago | 1

| accepted

Answered
Identify the minimum number of rows in a matrix meeting a condition
This solution uses the Optimization Toolbox, although I am still only half certain what row-selection rule you are looking for ...

1 día ago | 1

| accepted

Answered
Find max/min level of all intersections of a given contour curve with another set of contour curves
A method more along the lines of what you outlined in your initial post, is to put the x,y pairs of the i-th level set of A into...

1 día ago | 0

Answered
Find max/min level of all intersections of a given contour curve with another set of contour curves
The problem you describe cannot be well-defined in terms of discrete contour samples, because there are infinite choices of func...

2 días ago | 0

Answered
fmincon error in intial value
You must do something that not only gets rid of complex-valued results, but also respects fmincon's requirement that your object...

2 días ago | 0

Answered
Creating 3x201 matrix from set of numbers
I=(0:0.1e-10:20e-10).' *[1,1,1];

2 días ago | 1

Answered
how can i get the intersection of two step curves?
I have never heard the terminology "step curve", but see if one of these FEX submissions is useful to you, https://www.mathwork...

3 días ago | 0

Answered
Integral boundaries for a triangular plane
Here is an example from the documentation for integral2 of an integral over a triangular region: https://www.mathworks.com/help...

3 días ago | 0

Answered
Why does Multistart give a output same as the initial guess value?
I am sure the initial guess value (X0) do not give a global minimum. What have you done to verify that? Have you tested optimi...

3 días ago | 0

Answered
Export_fig - Ghostscript program not found
It probably doesn't matter unless you are going to try to export .eps or .epsc files. If you are, you should indeed install Ghos...

3 días ago | 0

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Answered
How to transform given XY coordinates using 'lwm' tform?
A forward version of the lwm transform is not provided because it is not guaranteed to be a 1-1 transformation, but perhaps it w...

3 días ago | 0

| accepted

Answered
linear equation with summation
q=A/D should already account for the summation. Your equation can be written just by replacing the summation with simple matrix ...

3 días ago | 0

| accepted

Answered
Working with for loop
I_values=1:4:len; final_delay=nan(1,numel(I_values)); %PRE-ALLOCATE!!!!!! for k=1:numel(I_values) i_value=I_...

3 días ago | 0

| accepted

Answered
Perform processing over each row of table starting from first non-zero element in that row
Your question implies that all elements of the table are numeric., e.g., T = 5×3 table Var1 Var2 Var3 ...

4 días ago | 0

Answered
Returning values from Blockproc
You could use mat2tiles https://www.mathworks.com/matlabcentral/fileexchange/35085-mat2tiles-divide-array-into-equal-sized-sub-...

4 días ago | 0

Answered
Column space of a matrix
You can use this FEX submission, https://www.mathworks.com/matlabcentral/fileexchange/77437-extract-linearly-independent-subset...

4 días ago | 0

Answered
How to label sorted variables
Maybe what you want: >> labels=string({"A","B","C"}); >> x = [1,1,3; 2,2,1; 3,3,2]; >> labels(x) ans = ...

4 días ago | 0

Answered
FSOLVE requires all values returned by user functions to be of data type double
The result I get from this is, xc = 0.1000 0.1500 0.2000 0.2500 0.3000 0.3500 0.4000 ...

4 días ago | 0

| accepted

Answered
Matrix 2-norm Condition number
sadly this isn't the first tine that the equal function fails with me and don't know the reason. The isequal() function didn't ...

4 días ago | 0

| accepted

Answered
Adding two linear inequality constraints in Optimization toolbox
But the optimization algorithm should still be able to handle it, right? Can it be accomodated in Aineq and bineq? One way you ...

7 días ago | 0

Answered
Interpolate values to the nearest 0.25 and create indices for these values
vals=linspace(0,8,32+1); rp1(:)=interp1(vals,vals, rp1(:),'nearest')

8 días ago | 0

| accepted

Answered
How to extend line of best fit to find x intercept ?
roots(p)

8 días ago | 1

| accepted

Answered
Operator '-' is not supported for operands of type 'cell'.
Check the contents of ATtable{1,3} and ATtable{1,5}. I bet they're not numbers.

8 días ago | 0

| accepted

Answered
How to draw a graph for function with constraints?
fimplicit(@(x,y) x.^2 + 4*x.*y +5*y.^2 - 10,'r'); hold on; fcontour(@(x,y) 3*x+4*y) ; hold off

8 días ago | 0

| accepted

Answered
Unable to perform assignment because the size of the left side is 98-by-50 and the size of the right side is 98-by-32.
Make the right hand side and the left hand side the same size.

8 días ago | 0

Answered
Repeatedly interpolating from scattered to regular grid with varying sample values
You can change the Values property of the scatteredInterpolant object. That can eliminate significant object re-building time, a...

8 días ago | 1

| accepted

Answered
Constraint function in optimization toolbox
As far as I can see from your code, the mass flow constraint is linear in para. You would use the linear inequality constraint a...

9 días ago | 0

| accepted

Answered
Creating optimization constraint with loop is too slow
The problem-based framework is not built for speed. It's built to make setting up small problems easy. So, it's already question...

9 días ago | 0

| accepted

Answered
Does anyone know how to use the matlab to calculate the minimu distance between a point outside oval and the oval surface?
You can use trustregprob from the File Exchange https://www.mathworks.com/matlabcentral/fileexchange/53191-quadratic-minimizati...

10 días ago | 0

| accepted

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