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Matt J


Last seen: Today |  Active since 2009

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Professional Interests: medical image processing, optimization algorithms

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Answered
Commenting Code inside for loop. Orientation Issue
No, but enhancement requests for this have been submitted (by me at least).

alrededor de 20 horas ago | 0

Answered
Custom class properties and method attributes
I don't know why it's not documented, but apparently there is a Description attribute that can be added, e.g., classdef myclass...

alrededor de 22 horas ago | 1

| accepted

Answered
How do I get the indexes of a symmetrical logical matrix without getting repetitions of those indexes?
[I,J]=find(yourMatrix); keep=(J>=I); I=I(keep); J=J(keep);

alrededor de 23 horas ago | 0

| accepted

Answered
calling seperate members of a vector function
There's no way to do that. You could do it if the components are held in struct form, e .g., F=@(x,y) struct('a',x-y,'b', y^2);...

1 día ago | 0

Answered
How can I increase the number of Fourier frequencies by adding 500 zeros to the end of the 27-sample-long signal ??
L = length(t)+500; fftx1=fft(x1, L)

3 días ago | 0

Answered
Matlab does not find new method in class folder without "clear classes"
I don't know if it's intended or not, but my experience is that it only happens when your class is in a @-directory. If you put ...

3 días ago | 0

Answered
Finding consecutive zeros in an array. Not able to solve using diff command
Using, https://www.mathworks.com/matlabcentral/fileexchange/78008-tools-for-processing-consecutive-repetitions-in-vectors [~,~...

3 días ago | 0

Answered
Solve equation with multiple values for V
Because there is no analytical solution. Try vpasolve() or fzero() instead.

3 días ago | 0

Answered
Help. Plot graph calculation
You mean, how to plot the triangle? You can do, x=linspace(0,3,1000); y=(1-abs(x-1)); y=y.*(y>=0); plot(x,y)

3 días ago | 0

Answered
Intensity Profile of a specific line
You could just use improfile() https://www.mathworks.com/help/images/ref/improfile.html

3 días ago | 0

Answered
Multiple plots on the same graph
I think the line where you plot is supposed to look like, semilogx(tc,PDF); but the code you've posted contains no variable c...

3 días ago | 0

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Answered
How to get rid of this line that connects the last and first point, I have made it white so its barely visible, but is there a way to not plot it?
plot3 (WayPTS(:,1), WayPTS(:,2), WayPTS(:,3),'black');

3 días ago | 0

Answered
How to create a custom Matrix following a set of parameters
n=5; A=-diff(eye(n+2),2,1); A(:,1)=[]

3 días ago | 0

Answered
How to create a custom Matrix following a set of parameters
n=5; c=[2,-1,zeros(1,n-2)]; r=[c,0]; A=toeplitz(c,r)

3 días ago | 0

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Answered
How to covert a 1D vector to 2D matrix with overlapping effectively?
X=randi(30, 1,14); segment_size = 4; overlap_rate = 0.5; d=segment_size*overlap_rate; idx=(1:segment_size)'+ ( 0:d:(num...

3 días ago | 0

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Answered
Plot elements of specific size
You could probably use a listener to increase the MarkerSize etc as a response to zooming in or out. The code below is an imple...

3 días ago | 1

Answered
Plot elements of specific size
First, I don't care about interactive zooming. I'd like to save a pdf. If the zooming is happening only after the pdf conversio...

4 días ago | 0

| accepted

Answered
how to write a function which converts graphs from linear scale to logarithmic scale and plot them both?
To convert the scale of an existing graph from linear to log, you can do, set(gca,'YScale','log') set(gca,'XScale','log')

4 días ago | 0

| accepted

Answered
Cropping the same roipoly for multiple images
I don't understand what you mean by "cropping" an image to a non-rectangular region. An image, cropped or otherwise, is an inher...

4 días ago | 0

| accepted

Answered
Calculating value of function in point
f=@(x)2*x+2.^x; test = evaluate(f,0,6,7) function matrix = evaluate(f,x,y,n) a = linspace(x,y,n); b = f(a); matrix = [a;b...

4 días ago | 0

Answered
Failure in initial objective function evaluation. FSOLVE cannot continue.
Is there supposed to be a '+' after teta1s? fval(2,1)=beta1c+teta1s+((2.66*mumr...

4 días ago | 0

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Answered
How to write a function with logical condition which takes an array and turns back an array?
K=sinc(alpha/pi*(x-y.'));

4 días ago | 1

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Answered
2D matrix multiply with 3D array
[m,n,p]=size(B); Br=reshape(B,[],p); Br=Br(:,1:200); %might not be necessary U1=Br*u; V1=Br*v; c=reshape( sum(U1.*V...

4 días ago | 0

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Answered
using eig to find the eigenvalues and eigenvectors of a large matrix on GPU
It might be a question of your hardware. On the GTX 1050 in R2020b, I see only about a 10% speed-up in double precision and abou...

4 días ago | 0

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Answered
A function does not work with an array as an input argument
args={'ArrayValued',1}; MyFun = @(a, x) ( integral(@(k) k .* (1 ./ ( 1 + (a*k - x).^2 )), -1, 1,args{:}) ./ ... integral(@(k...

5 días ago | 1

| accepted

Answered
Rounding errors when using quadprog
There's nothing wrong with post-rounding, however setting lb(i)=ub(i)=0 for the appropriate variables should force them to an ex...

5 días ago | 0

Answered
Connect the optimizer function to data extracted from another software
You've written a fitness function f=@(~) e_and_r_vals(md_e,E_best_vals_from_md_r) which takes no input arguments. The fitness ...

5 días ago | 0

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Answered
Is there an alternative to eval in a struct?
Your data organization seems like it should be reconsidered. In a struct, it doesn't make sense if different fields have essenti...

5 días ago | 0

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Answered
Expressing polynomial including a indefinite parameter
Possibly you mean that you want a coefficient vector as the output, rather than a polynomial in functional form. syms a x P ...

6 días ago | 0

Answered
Expressing polynomial including a indefinite parameter
One way. p = @(x,a) polyval([a,-4,2-a],x); Usage: x=1; a=2; p(x,a)

6 días ago | 1

| accepted

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