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Matt J

Last seen: Today
6,307 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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How to run fmincon using following function?
With no constraints, it would simply be, x=ones(200)/(-c*B);

15 hours ago | 0

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Fsolve function does not solve a nonlinear system with complex conjugation.

15 hours ago | 0

No solution found when solving 3 non linear equations
A numerical sweep also gives evidence that there is no solution [x1,x2,x3]=ndgrid(linspace(-pi,+pi,512)); F1=cos(-x1+x2)+c...

22 hours ago | 0

How do you call an inline or anonymous function within cellfun?
I reverted back to the for loop This might be faster than the for-loop, allB=[B{:}]; idx=ismember(allB,A); Blens=cellfun('l...

1 day ago | 0

How do you call an inline or anonymous function within cellfun?
But would still like to know how to use anonymous functions within cellfun There's no difference. Since findVal is already a fu...

1 day ago | 0

Converged to an infeasible point.
The initial guess you have chosen x0 = [1,1,1,1,1,1,1,1]; seems very arbitrary. You should devise an initial guess more likely...

2 days ago | 0

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Matrix sequence manipulation for multiple value assignment
e=1:numel(A); lidx= any(idxes(:,1)<=e & e<=idxes(:,2),1); A(lidx)=1;

3 days ago | 0

Matrix sequence manipulation for multiple value assignment
If the intervals will always be disjoint, A=zeros(20,1); n=numel(A); A(idxes(:,1))=1; A(idxes(:,2)+1)=-1; A=cumsum(A(1:n)...

3 days ago | 0

Getting the coordinates of vertices of an A4 sheet with coins on it, for its further projective transformation and coin detection
The Computer Vision Toolbox has a few corner point detector apps, https://www.mathworks.com/help/vision/ug/point-feature-types....

3 days ago | 0

Relocate a value of a vector.
A=[1 2 3 4 5 6 7 8 9 0]; i=2; %position removed j=7; %target position B=A; k=i<j; B(i)=inf; C = [B(1:j+k-1),A(i),...

5 days ago | 2

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table less than operator
Are you sure you do not instead want to compare the content of a variable in the table to something?... yes this what I'm trying...

5 days ago | 0

Why is N not being displayed?
Because the loop condition is never satisfied and therefore nothing within it is ever executed. I think you meant to have, whil...

5 days ago | 0

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Displaying information about the data set by clicking on its plot and then show a value that is associated with the (x,y) point
.... set(dcm,'UpdateFcn',@(t,e) myupdatefcn(t,e,x,y) ); function txt = myupdatefcn(~,event,xdata,ydata) pos = get(eve...

5 days ago | 0

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Getting the linear portion of a non-linear curve
I'm not sure why a 2nd derivative test wouldn't have worked, as long as your points are noiseless: i=find( abs(diff(x,2))>somet...

5 days ago | 1

How to return the smallest vector.
If you "have them" in cell array form, then you could do something like this: >> vectors={[3 4 5],[1,2],[5 6 7 8]} vectors =...

6 days ago | 0

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a problem with setting fmincon options?
I would guess that you entered your options object as the 9th input argument to fmincon when it really should be the 10th. If yo...

6 days ago | 0

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set Precision in lsqcurvefit
You cannot do such a thing with lsqcurvefit. What you describe would require that you rewrite your objective function and bounds...

6 days ago | 2

Delete part of an image

6 days ago | 2

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Find the orientation of the skeletonized image
You can use houghlines to get the endpoints of all the line segments in the image. From that, you can easily calculate their slo...

6 days ago | 0

Using cell array to define Argument list in function Handle
That is not the right approach. You should be taking advantage of the fact that this is Matlab, and that your variables are allo...

7 days ago | 0

Divide plane into two separate planes
Let b1 and b2 be basis vectors for the plane and let x0 be a point in the plane. Then, for example, x0(:) + b1(:)*randn(1,N) + ...

7 days ago | 0

how to plot values that only fall within a range?
KPH_70 = mean(Y(FVY)); yyaxis left plot(X(FVY),Y(FVY)); yyaxis right plot(X(FVY),KPH_70*ones(size(FVY)));

7 days ago | 0

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How to pass a vector to a function that creates matrix
>> b=[1 2 3]*10; >> T=@(i) [b(i)+9 , 8 ; 8 , 7 ]; >> T(3) ans = 39 8 8 7

7 days ago | 0

how to calculate direction in rotated coordinate system

8 days ago | 0

How to work with Nelder-Mead algorithm with 7 unknown variables?
You can use fminsearch (an implementation of Nelder-Mead) with any number of variables. However, there is no way to gaurantee th...

8 days ago | 2

f(x)=sin(x)-x^5=0 providing x is not equals 0 ,function in the interval x [0,3]
>> [x0,fval]=fzero(@(x)sin(x)-x.^5,[0.8,1]) x0 = 0.9610 fval = -1.1102e-16

8 days ago | 0

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Generating Toeplitz Matrix which Matches the Convolution Shape Same
Using interpMatrix (Download), nH=numel(vH); nX=numel(vX); ic=ceil( (nH+1)/2); mH = interpMatrix(vH,ic , nX,1);

8 days ago | 0

Generating Toeplitz Matrix which Matches the Convolution Shape Same
I am specifically asking about using the function toeplitz(). If it must be with toeplitz, then: nH=numel(vH); nX=numel(vX); ...

8 days ago | 0

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Concatenating matrices in a file into another matrix
For example, >> p1=[1,2,3]; p2=[4 5 6]; p3=[7 8 9]; save p p1 p2 p3 >> A=cell2mat(struct2cell(load('p'))) A = 1 ...

8 days ago | 0

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