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Matt J


Last seen: Today
6,298 2009 이후 총 참여 횟수

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
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),...

1일 전 | 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...

1일 전 | 0

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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...

1일 전 | 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...

1일 전 | 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...

2일 전 | 1

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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 =...

2일 전 | 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...

2일 전 | 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...

3일 전 | 2

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Delete part of an image
[m,n]=size(oldImage); x=(1:n); y=(1:m).'; mask = (x-innerCenterX).^2+(y-innerCenterY).^2>=innerRadius^2 & ... (x...

3일 전 | 2

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답변 있음
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...

3일 전 | 0

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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...

4일 전 | 0

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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) + ...

4일 전 | 0

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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)));

4일 전 | 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

4일 전 | 0

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how to calculate direction in rotated coordinate system
Using AxelRot (Download), and assuming all angles are given in radians, [x,y,z] = sph2cart(Azi_Old,Elev_Old,1); P=AxelRot( ...

5일 전 | 0

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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...

5일 전 | 2

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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

5일 전 | 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);

5일 전 | 0

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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); ...

5일 전 | 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 ...

5일 전 | 0

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Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 2.240406e-24.
Even with A\B, you cannot expect reliable behavior with RCOND as small as 2.240406e-24. For all intents and purposes, your mat...

5일 전 | 0

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Fit a conic section without mirror image hyperbola
This approach uses John's fminspleas FEX submission (Download). Although the fit is, technically, a hyperbola, it diverges to a ...

5일 전 | 1

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rotating and saving images to folder: error during loop
The code works fine for me. If I had to guess, I would say it is because you ran the code previously while debugging and never c...

5일 전 | 0

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Defining constraints in the Quadratic Programming
If you have a quadratic function of only 1 unknown variable, it should be possible to find the minimum analytically - no iterati...

5일 전 | 0

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PARFOR: Broadcast variable
The code looks suspiciously like an attempt at weighted normalized cross-correlation. If so, see here for a possibly faster alte...

5일 전 | 1

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Forming a block diagonal matrix of one certain matrix?
using interpMatrix (Download) S=1*ones(2); B=2*ones(2); C=3*ones(2); copies=4; %number of repetitions L=flip( {S,B,C, z...

6일 전 | 0

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Generating Toeplitz Matrix which Matches the Convolution Shape Same
Using func2mat (Download), mH=func2mat(@(vX) conv(vX, vH, 'same'), ones(length(vX),1));

6일 전 | 0

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Fast method to find average pairwise distance of a very large matrix?
I don't know about the mean distance, but the mean squared or root mean squared distance is pretty easy. Compare: A=rand(330000...

9일 전 | 0

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Creating a Random Upper Triangular Matrix with Unique Entries for Efficiently Computing Matrix Exponential.
Just use randi, e.g., >> k=8; M = triu(randi(10,k,k)) M = 9 10 5 7 3 5 8 10 0 10 ...

9일 전 | 0

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How can I extrapolate the value for the slope of the line?
You could do, p=polyfit(log(x),log(y),1); slope=p(1);

9일 전 | 0

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