how to create a symmetric Toeplitz matrix with bounds on eigenvalues?
R=fft(eye(400))/sqrt(400); e=zeros(1,400); e(2)=-10; e(end-1)=+10; e=ifftshift(e); T=(R'*diag(e)*R); T=real((T+T.')/2);...

29 Tage ago | 1

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optimization problem wont find any solutions
The problem is infeasible, or your initial guess x0 is too far from a feasible point.

29 Tage ago | 0

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making coarse matrix from fine resolution matrix
A 3rd approach, more memory conserving and faster,. Z1=randi(100,8640,4320); u = 5; %upsampling factor d = 12; %...

30 Tage ago | 1

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3D image template matching by using (normalized) cross correlation?
I've never used it myself , but you could try this FEX submission, https://www.mathworks.com/matlabcentral/fileexchange/73946-n...

etwa ein Monat ago | 0

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making coarse matrix from fine resolution matrix
If you have the Image Processing Toolbox, abc1=imresize(Z1,[3600,1800])

etwa ein Monat ago | 1

find the element in matrix of intersecting vectors
attainedA=( max(a,[],1)==a ); attainedB=( max(b,[],2)==b ); result = c(attainedA & attainedB)

etwa ein Monat ago | 1

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Quadprog message: The problem is non-convex
You cannot submit a problem that is borderline convex to quadprog if it is using an algorithm that expects convexity. If you do,...

etwa ein Monat ago | 1

How to define a plane by matrices instead of a function?
For example, A = [104,122,111]; B = [253,122,153]; C = [104,124,111]; normal=normalize( cross(A-B,A-C),'norm'); %calcul...

etwa ein Monat ago | 1

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When using the cftool, should I use Trust Region or Levenberg-Marquardt?
You can read here about the relative limitations of the 2 algorithms, https://www.mathworks.com/help/optim/ug/lsqcurvefit.html#...

etwa ein Monat ago | 0

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Need Math to Rotate XYZ Point Around A-B Rotary Axes
See Rodrigues' formula, https://en.wikipedia.org/wiki/Rodrigues%27_rotation_formula Also, though you are apparently not worki...

etwa ein Monat ago | 0

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

etwa ein Monat ago | 0

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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...

etwa ein Monat ago | 0

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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...

etwa ein Monat ago | 1

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...

etwa ein Monat ago | 0

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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...

etwa ein Monat 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;

etwa ein Monat 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)...

etwa ein Monat 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....

etwa ein Monat 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),...

etwa ein Monat 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...

etwa ein Monat 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...

etwa ein Monat 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...

etwa ein Monat 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...

etwa ein Monat 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 =...

etwa ein Monat 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...

etwa ein Monat 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...

etwa ein Monat ago | 2

Delete part of an image

etwa ein Monat 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...

etwa ein Monat 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...

etwa ein Monat ago | 0