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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
Why do I get an error using "-" along with the message "too many output arguments" when using fmincon?
You have not shown us fValue2, but more than likely, it does not specify any output arguments to be returned.

ungefär 4 timmar ago | 0

Answered
Extract the bigger number of values from the previous one in an array
Easier to do, Data = rand(1,15) X=10*(diff(Data)>0)

ungefär 4 timmar ago | 0

| accepted

Answered
Fit ellipse in 3D space
Another possibility is to use this FEX download, https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-to...

ungefär 4 timmar ago | 0

| accepted

Answered
Help using fmincon to find the 2 support locations (x1,x2) that minimize maximum bending moment
I need to minimize the maximum bending moment from 0 to L Do you mean the maximum from among [b1 b2 b3]? If so, you probably wa...

ungefär 8 timmar ago | 0

Answered
Find the key for vector transformation
See Example 2: Optimal Reordering of Points in the Examples tab of https://www.mathworks.com/matlabcentral/fileexchange/52795-c...

ungefär 14 timmar ago | 0

Answered
How to create a column vector repeating the same character n times?
and has the same character repeating in each row like 'on'. 'on' contains two characters. Repeating it for N rows would give a...

ungefär 16 timmar ago | 1

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Answered
Removal of the the edges from the node of a graph
You want to remove the edges but keep the node itself? If so, G=rmedge(G,outedges(G,nodeID)) If you want to remove the node an...

ungefär 16 timmar ago | 0

| accepted

Answered
How to obtain and plot perpedicular lines using the gradient of a function
Your plot is correct. The lines just don't look perpendicular because of the plot aspect ratio. x = linspace(-2,1,100)'; y ...

ungefär 19 timmar ago | 0

| accepted

Answered
Fit ellipse in 3D space
I am searching for intersection of plane and ellipsoid If that is the ultimate goal, you should just rewrite the ellipsoid equa...

en dag ago | 0

Answered
How can I transparent my gaussian distribution and convert to a transparent ellipse
You can extract the points on the contour lines using tis FEX download https://www.mathworks.com/matlabcentral/fileexchange/740...

en dag ago | 0

| accepted

Submitted


Further tools for analyzing objects in N-dimensional images
A collection of tools to supplement bwpropfilt, bwareaopen, and the like.

2 dagar ago | 4 downloads |

Answered
How can I remove object in binary image by using a mask
You can use bwlmaskpropfiltn() from this FEX download, https://www.mathworks.com/matlabcentral/fileexchange/90762-further-tools...

2 dagar ago | 0

Answered
How can I include the legends within the for loop and how can I set the xticks in MATLAB?
So, how can I include legends with the for loop instead of writing it outside? You are assuming here that the for loop is the o...

3 dagar ago | 0

| accepted

Answered
Rect function with Array
function [y] = rect(T0, A, t) y= ((t >= -T0/2) & (t <= T0/2)) * A; end

4 dagar ago | 0

| accepted

Answered
Count the occurrence of each element in an array
string = 'I am happy'; [N,e]=histcounts(double(string),32:130); table(char(e(N>0)'),N(N>0)','VariableNames',{'Character','...

5 dagar ago | 0

| accepted

Answered
Why the outcome of my code is just white image?
Give imshow() a second argument to see the desired grayscale range. img1=im2gray(imread('cameraman.tif')); kernel = ones(3, ...

5 dagar ago | 1

Answered
if and sum not working together
Because the sum cannot be done exactly in floating point. Therefore you need a tolerance, a = zeros(10,1)+0.001; b = sum(a) i...

5 dagar ago | 1

| accepted

Answered
what exactly norm(x) function do?
Assuming you only care about p=2, If you already have code that computes norm(x) for real x, you can extend it to complex x via,...

6 dagar ago | 0

Answered
Formula for norm(x)
Assuming you're only interested in p=2, if you already have code that computes norm(x) for real x, you can extend it to complex ...

6 dagar ago | 0

Answered
Multiple Image reconstruction with real and imaginary part in 2d array
What is the name of the variable stored inside the .mat files? If I assume it is X, then, a_real = load("img_real.mat").X; a_i...

6 dagar ago | 0

| accepted

Answered
Equality between 2 floats not recognized when using <= relational operator
I feel pretty confident that either Money_types or Var2 is not truly equal to 0.05 in spite of what you suppose. It may appear t...

6 dagar ago | 0

Answered
Concatenate vectors stored in cell array
cell2mat( reshape( yourCell.' ,1,[],27) )

6 dagar ago | 1

Answered
Why ifft results of analytic signal spectrum don't match with theoretical time formula?
The IFFT and the continuous inverse Fourier transform are not the same thing. tau=0.4; t0=2.8; mag=10; Fs=200; dT=1/Fs; ...

6 dagar ago | 0

| accepted

Answered
Add constraints to intermediate variables in the process of using least squares to minimize the objective function to fit the parameters of the equation
With the constraints you mention, the problem does not fall within the scope of lsqnonlin. You will have to use fmincon, which a...

6 dagar ago | 0

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Answered
Trapezoidal rule with unevenly spaced data points
See trapz.

7 dagar ago | 0

Answered
regionprops Bounding box property returns values outside image dimensions
You should be comparing BoundingBox(1) with ImageSize(2) image = imread('https://www.mathworks.com/matlabcentral/answers/uploa...

7 dagar ago | 1

Answered
How do I graph a summation over an interval?
n=(0:10).'; fcn=@(x)sum( (2/3).^n .* cos(9.^n.*(pi.*x)) ); fplot(fcn,[-1,1]/10)

7 dagar ago | 1

| accepted

Answered
How to Vectorize this Code?
n3Array=normalize(n3Array,2,'n'); b0=b0/norm(b0); b0angles=acosd(n3Array*b0);

7 dagar ago | 0

| accepted

Answered
ScatteredInterpolant for Surface Extrapolation
The surface appears to be very well modeled by a Gaussian. An appropriate thing would therefore be to extrapolate using a Gaussi...

7 dagar ago | 0

| accepted

Answered
ScatteredInterpolant for Surface Extrapolation
[MAP_X,MAP_Y,MAP_Z]=readvars('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1131415/MATLAB.csv'); res=@(q)re...

7 dagar ago | 0

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