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Matt J


Last seen: Today 2009 이후 활성

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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답변 있음
using fsolve function to solve for 2 unknowns
x0 = [80,110]; [sol, Fsol] = fsolve(@problem_one,x0), function F = problem_one(theta) theta3 = theta(1); theta4 ...

1일 전 | 1

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fminunc initial point is local minimum, but fminsearch returns reasonable estaimtes
It could happen if your objective function is piece-wise flat (and hence non-differentiable). fminsearch is a derivative-free so...

1일 전 | 0

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How can I obtain the Fourier Transformation as a product of matrices?
N = (0:255).'; X = (2*cos(((15.8*pi)/128)*N)) + (3*sin(((27.3*pi)/128)*N)); F=fft( eye(numel(X)), [],1); fX = fft(X); %...

1일 전 | 0

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How to plot binary matrix as dots?
imshow(yourMatrix)

1일 전 | 0

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Solving non linear equation "Circle" equations
Because you cannot be certain of an exact 3-way (or n-way) intersection, you need to use a numerical least squares solver like f...

1일 전 | 1

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What is the real value of "single(my_variable)"?
So the C code keeps good precission. But, does Matlab? Yes, if by "good precision" you mean up to 7 digits. You can see that ev...

1일 전 | 0

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How to define a constat in function handle?
You mean like this? [a,b,c]=deal(3,4,5); f = @(x,y)a*x.^2+b*y+c Or like this? syms x y a b c f(x,y) f(x,y)=a*x.^2+b*y+...

1일 전 | 0

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Steepest descent with exact line search method
n=input("Enter the roll number:"); fobj=@(x) (x(1)-n)^2 + (x(2)-2*n)^2; gradobj=@(x)2*[(x(1)-n), (x(2)-2*n)]; x0=[1 1]; ...

1일 전 | 0

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how to develope loop to save the 'n' elements from the vectors
It is not a good idea to store A(i) in separate variables. You should probably just write your equation in terms of vector opera...

1일 전 | 2

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Taylor series approximation problem
As an example, syms x T=taylor(exp(-x),x,7,'Order',4) fn=matlabFunction(T) fn(3) You can of course find more examples...

1일 전 | 0

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how can I call a class in a gui?
I have defined a class TimeData by a script Don't you mean you defined it in a classdef file? The constructor function for a c...

2일 전 | 0

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Trying to supply fsolve with system's Jacobian but receiving error ''check for incorrect argument data type"
It is not clear (from what you posted), why you are using symbolic variable manipulation at all. fsolve is a numerical solver, n...

2일 전 | 0

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Rotate Values of Matrix
Use imtranslate() to center the source in the image, then use imrotate() it by the desired angle, then use imtranslate() once mo...

2일 전 | 0

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Get the last for digits as the time this message was sent
Is this what you want? str=char( "!AIVDM,1,1,,A,13cut>1001P:3LRGa`P@jip400S<,0*410002" ) str(end-3:end)

2일 전 | 1

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Is it possible to set an upper limit on the step size used by fsolve?
You could try playing with the InitDampling option parameter used by the Levenberg-Marquardt method.

3일 전 | 0

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Am I understanding this correctly?
If by "low" you mean zero and by "high" you mean 255, then yes.

3일 전 | 0

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Not sure why while loop won't run.
balance(1) = 1000; contribution = 1200; interest = 0.0025; M = 2; % month ticker while balance(end) < 500000 ba...

3일 전 | 2

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How select data just out from a polygon, considering a constraint
borders=[0,0;0,1;1 1;1 0]; p=polyshape(borders); p=blurHull(p,[0.3,0]); p=blurHull(p,[0, 0.1]); isinterior(p,datas) ...

3일 전 | 0

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답변 있음
Creating Matrix Subset automatic.
You should be doing it as follows: S=A([1,4,7],:);

3일 전 | 0

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답변 있음
How can I sort vector according to its index?
[vect,ind]=sort(vect,'descend')

3일 전 | 0

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Plotting Phase Plane in Matlab
For example, funx=@(t) c1*exp(-3*t)+c2*exp(-t); funy=@(t) -c1*exp(-3*t); fplot(funx,funy,[0,1]) or t=linspace(0,1,100); ...

4일 전 | 0

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Unable to perform assignment because the indices on the left side are not compatible with the size of the right side
parfor i=1:16000 tmp=double(solve(f==A(i),x)); if isempty(tmp), warning 'No sol...

4일 전 | 1

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답변 있음
Newton's method
Tab=[]; for x = -1:0.05:5 Tab = [Tab , newton(@f1,@df1,x,10^(-8)) ] end

4일 전 | 0

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답변 있음
add a row to a matrix each loop
Just concatenate: A=eye(5) newrow=rand(1,5); A=[A;newrow]

4일 전 | 0

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Registering two images where the camera has translated
The default multi-modal options seem to work pretty well. imreader=@(z,s) imresize(rgb2gray(imread(z)),s); %Register at ...

4일 전 | 0

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How to draw 9 cones using kronecker product?
If you have the matrix of surface values of a single cone, you could simply do, surf(kron(ones(3), singleCone))

4일 전 | 0

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Why does my matrix give me a syntax error
(It follows the END that terminates the definition of the function "Fnorm".) That is not allowed. All local functions must be p...

5일 전 | 0

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How can I make MATLAB shade the area of the virtual intersection between two lines?
You can use fill() or patch().

5일 전 | 1

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How to select rectangle ROI in the image and adjust the position of ROI manually. Then it can return the adjusted ROI position
h=drawrectangle(); wait(h); You must double-click on the rectangle to confirm its position and return control to Matlab.

5일 전 | 0

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Mirrored ifft and ifft2
If you do ifft(x,'symmetric'), the actual right hand side values will be ignored, or rather assumed to be a mirroring of the lef...

5일 전 | 0

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