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Matt J


Last seen: Today |  Active since 2009

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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
lsqnonlin optimization: large condition number of Jacobian matrix at all iterations, but full rank
Your scaling isn't really doing anything meaningful, since all residuals are weighted equally. Really, you are just multiplying ...

4 hours ago | 1

Answered
Solving a complicated symbolic equation
A=3; B=9; f=@(x)A-B*x*sinh(x); [x,fval]=fzero(f,[0,10]) %first solution [x,fval]=fzero(f,[-10,0]) %second solution

5 hours ago | 1

Answered
All functions in a script must be closed with an 'end'.
Replace "return" by "end"

19 hours ago | 0

| accepted

Answered
Extract "labelhandles" from Legend
Would it be possible to get the content of the second output of the legend, i.e. "labelhandles", just by calling the first outpu...

21 hours ago | 2

| accepted

Answered
Looping scatteredInterpolant across each frame in 3D matrix
Since your grids are related by an affine warping, it might be best to use imwarp, assuming you have the appropriate toolbox.Exa...

24 hours ago | 0

Answered
How to plot a function on a user defined plane when using spherical coordinate system by specifying elevation and azimuth values at a given radial distance?
The three spherical coordinates theta, phi, and r are not enough to define the sampling of a plane. You must also define coordin...

2 days ago | 0

Answered
How to plot a function on a user defined plane when using spherical coordinate system by specifying elevation and azimuth values at a given radial distance?
See slice.

2 days ago | 0

| accepted

Answered
Calculation errors while using subs and det functions
You haven't given us access to the input variables needed to repeat the computation. However, the determinant you are evaluating...

4 days ago | 0

| accepted

Answered
Extracting from boxchart function the median, quartiles, and whisker data.
I don't believe those quantitites are directly available as permanent property data. When you position the cursor over one of th...

4 days ago | 1

| accepted

Answered
How to define the order of layers/plots and axes?
1) Hfig=figure('Visible','off); p(1) = plot(...); p(2) = scatter(...). p(3) = line(..); p(4) = fill(...), p(5) = imagesc(...) ...

4 days ago | 0

Answered
error in the process of symbol operation of the matrix
Nothing is wrong with T, though possibly you didn't scroll down far enough to see the definitions of all the sigmas.

4 days ago | 0

Answered
Is it possible to handle a slider with an 'on-line' update? I mean, updating the value continously during the sliding.
Yes, use the ValueCHangingFcn callback https://www.mathworks.com/help/matlab/ref/uislider.html#buicpgg-1_sep_shared-ValueChangi...

5 days ago | 0

Answered
How to extract rows of data according to text containing specific words in cells in Matlab
copepods= contains(C.object_id,"cruise2012") & ... contains(C.object_annotation_hierarchy,"Copepoda");

6 days ago | 0

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Answered
lsqcurvefit does not follow convergence criteria in summation.
After the fit has converged (but not giving a useful result) I checked for the convergence criterion and it wasn't replaced with...

6 days ago | 0

| accepted

Answered
Unrecognized function or variable 'x0'.
Relocate the last 2 lines from newmintafun1 and make x0 the correct length. x0 = [10; 6; 4; 3; 4; 3; 2; 3; 18; 7; 25; 10; 5; 5;...

6 days ago | 0

| accepted

Answered
How to create big matrix that the item is small matrix
See, How to Generate a Block Toeplitz Matrix. Then replace the last D block with F, Matrix(end-11:end,end-11:end)=F;

6 days ago | 0

Answered
Fit gaussian surface on 3D data
Using gaussfitn from, https://www.mathworks.com/matlabcentral/fileexchange/69116-gaussfitn load Image %cropped to include onl...

6 days ago | 1

Question


Reloading handle objects from .mat files
Why does isequal() return false when the reloaded handle is compared to the original handle, in the code below. h=plot(1:5); s...

7 days ago | 2 answers | 0

2

answers

Answered
Solve linear equation in matrix form with least square method
If I use (A.'*A)\(A.'*b), i can get the result An even easier and more accurate way to get it is, x=A\b and that is the meth...

7 days ago | 0

| accepted

Answered
Interpreting the results of 'fsolve'
It means fsolve thinks it found a solution. Whether you can "trust" the solution is an open-ended question. It depends on the ap...

8 days ago | 0

Answered
using matchpairs when objects have different capacities
Then you are not seeking pairings. Therefore, matchpairs will not apply. But you can probably use minL1intlin from this FEX down...

8 days ago | 0

Answered
Coding volume segmentation with multiple thresholds (CT data)
I can iterate through different CT number thresholds, using a function to create a binary mask (a 3D matrix) at each. However, I...

9 days ago | 0

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Answered
Attempt to grow array along ambiguous dimension
In this line, idealF1(distance4 <= D01)=0; you have not checked the size of distance4 and of idealF1.

9 days ago | 0

Answered
want to plot ellipses with different a and b values in x^2/a^2 + y^2/b^2 = 1 in Matlab 3d plot
Simplie enough. a=0.1;b=0.15; fsurf(@(x,y) x.^2/a^2+y.^2/b^2) ;

9 days ago | 0

Answered
How do I fit two data sets to each other?
Sounds like a 1D image registration problem. Maybe consider imregtform.

10 days ago | 0

Answered
Trying to do an if/and statement on a vector but have an addition apply to only one element of vector
I think a better method would be to update the compass position incrementally, using the attached file cumangle.m t=linspace(-1...

10 days ago | 0

Answered
generate all variations on a 20-mer, that are 1 to 4 mismatches away
Using blkColon from this FEX download, https://www.mathworks.com/matlabcentral/fileexchange/115340-block-transposition-permutat...

10 days ago | 0

| accepted

Answered
How can I make the numeric edit field blank?
You can set the ValueDisplayFormat property to %0.0d

11 days ago | 1

| accepted

Answered
How can we increase/decrease the number of triangles in a triangulation that is created from a polyshape object?
Another way: p1=nsidedpoly(6); p2=p1.scale(0.5); P=subtract(p1,p2); P=subTri(P); for i=1:3 P=splitTri(P); end pl...

11 days ago | 0

Answered
creating multiple arrays that all have the same name with different number
You wouldn't do that. You would instead combine all the calculations into a single matrix Gcr: density = 1000; g = 9.8; gamma...

12 days ago | 1

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