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Matt J


Last seen: Today
6.630 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
Why do I get different values when I run gamultiobj for my curve-fitting problem?
I'm not sure why you thought gamultiobj was appropriate for this. gamultiobj is a multi-objective optimizer and therefore will r...

ongeveer 2 uur ago | 0

Answered
Importing struct into app designer
The fieldnames command https://www.mathworks.com/help/matlab/ref/fieldnames.html Or, you could just do mergetable1=struct2tab...

ongeveer 2 uur ago | 0

Answered
Averaging certain values within an array
Yes, you can use splitapply(@mean,data,G) https://www.mathworks.com/help/matlab/ref/splitapply.html with G identifying the reg...

ongeveer 2 uur ago | 0

Answered
Error "Index in position 1 exceeds array bounds (must not exceed 1)" for a matrix that has a size of 2000x11
I am getting the error as listed in the title for line 68 C(i,j)=(-lamda(i,j)+4*A(i,j)/3)/(Kl+4*G(i,j)/3); of the following co...

ongeveer 4 uur ago | 0

Answered
Z translate 3D matrix data
One way, [m,n,p]=size(M); [I,J,K]=ndgrid(1:m,1:n,1:p); Knew=K+T; result = accumarray([I(:),J(:),Knew(:)],M(:)),

ongeveer 5 uur ago | 0

Answered
Unable to perform assignment because the size of the left side is 2-by-1 and the size of the right side is 1-by-3.
This error message results from doing something like this: >> x=rand(2,3); >> x(:,1)=[4,5,6] Unable to perform assignment bec...

ongeveer 5 uur ago | 0

Answered
Lable dimensions of multidimensional array
There is no quick way to enable this, I'm afraid. You would have too write your own customized data object type and provide a su...

ongeveer 5 uur ago | 0

Answered
Operator '.*' is not supported for operands of type 'cell'.
Well, you need to check whether B is a cell array or not (it almost certainly is). Did your call to cell2mat work?

ongeveer 5 uur ago | 0

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...

1 dag ago | 1

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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 dag ago | 1

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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 ...

2 dagen ago | 1

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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...

2 dagen 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 dagen 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 dagen ago | 0

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

2 dagen 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 dagen 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 dagen 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...

4 dagen 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...

4 dagen 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...

4 dagen ago | 0

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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 ...

4 dagen ago | 0

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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_...

4 dagen ago | 0

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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 dagen 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 dagen 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 dagen 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 dagen 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 dagen ago | 0

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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 dagen ago | 0

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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 ...

8 dagen 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 dagen ago | 0

| accepted

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