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Matt J


Last seen: Today
7,993 2009 이후 총 참여 횟수

Professional Interests: medical image processing, optimization algorithms

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Fitting cone/cylinder of known dimensions to 3D surface data
I've recently added a cone-fitting routine to this FIle Exchange package, https://www.mathworks.com/matlabcentral/fileexchange/...

약 11시간 전 | 0

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Object-oriented tools for fitting conics and quadrics
A tool set for fitting various conics and quadric surfaces, e.g., ellipses, cylinders, spheres, planes, cones, and lines.

약 11시간 전 | 다운로드 수: 13 |

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Optimization least square approach
Shouldn't it be err = sum (real(error).^2) + sum(imag(error).^2) ; If so, then this is a linear least squares problem, and you...

약 17시간 전 | 0

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Fitting cone/cylinder of known dimensions to 3D surface data
I am providing a guess that is not too far from the original values. If so, it sounds like there is an error in your calculatio...

1일 전 | 0

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Reducing every value of a matrice every time by the same value
This might be what you want, but as @Scott MacKenzie says you've left a lot of problem details and issues for us to guess, whil...

2일 전 | 0

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Problem structure with LSQNONLIN set in optimoptions object still uses FMINCON
I don't think you can use the optimvar framework to launch lsqnonlin, because lsqnonlin does not take a scalar objective. You wi...

2일 전 | 0

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How to extract the Jacobian matrix from the given equation?
If EX and EY are positive definite, one solution is simply, J=chol(EY).'/chol(EX).' In general, there won't be a unique soluti...

2일 전 | 1

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Optimization problem with quadratic function
You can use isosurface() to plot and quadprog() to minimize.

3일 전 | 0

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anyway to find common tangent for two functions
The problem has 6 unknowns, the (xc,yc) coordinates of the circle center and the (x,y) coordinates of each point of tangency. Ea...

3일 전 | 0

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how can we compare two columns for a particular value of another column?
Say A is the matrix of values. [~,uniqueRows]=unique(A(:,[1,4,5]),'rows') This will tell you which rows can be kept so as to ...

3일 전 | 0

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Can the matrix be displayed in a way other than imagesc, imshow, image or pcolor commands (similar to the plot command)?
One possibility is to use pgonCorners (which must be Downloaded) https://www.mathworks.com/matlabcentral/fileexchange/74181-fin...

4일 전 | 0

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Submatrix sum (but just on a section)
You can use sepblockfun (Download) A=rand(4914); B1=sepblockfun(A,[189,1],'sum'); %the results B2=sepblockfun(A,[1,189],'su...

5일 전 | 0

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How can I change for-loop into matrix way?
This gives some speed-up. %Fake Data m=100;n=1000; B=rand(15,1); D=rand(3,1); A=B(randi(15,m+1,n)); E=D(randi(3,m+1,1))...

5일 전 | 0

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How to check whether multiple variables are numeric using a loop
varname=D_mat_search(aa); if exist(varname,'var') && isnumeric(eval(varname)) && isfile(File_loc_ID) %BAD

5일 전 | 0

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OOP: Reference (subclass) enumeration names from static superclass method. Possible?
No, you can't unfortunately, but you can avoid copying the method to all the sub-classdef's just by making doWork() an external ...

5일 전 | 1

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How to fill a volume plot of a vector valued functions (with 3 variables)
See quiver3. https://www.mathworks.com/help/matlab/ref/quiver3.html

6일 전 | 0

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How to find the polynomial equation when factors is provided?
p = poly([-7,19,18,-17])

6일 전 | 1

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Percentile calculation along time
T=cat(3,A,B,C,D,E) ; prctile( T ,50,3 )

6일 전 | 0

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Help: Using fminsearch to calculate fractional derivatives
Your optimization problem appears to be an unconstrained, linear least squares minimization. I don't see why you need an iterati...

6일 전 | 0

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Angle of lines in binary image
It may be helpful to use linear2dFit from this FIle Exchange package https://www.mathworks.com/matlabcentral/fileexchange/87584...

6일 전 | 0

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Fitting exponential curve in data
A more efficient and direct way would be to use fminspleas (Download) load data funlist={@(tau,t)exp(-t/tau),1}; idx=tdat...

6일 전 | 0

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How to plot 2 lines and find the coordinates of their intersection?
Using this File Exchange submission, https://www.mathworks.com/matlabcentral/fileexchange/93470-intersections-of-multiple-2d-li...

7일 전 | 0

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How can I fit an ellipse in 3D space to find it's center coordinates in (x,y,z)?
Basically, the procedure would be to Fit a plane to your data. Project your (x,y,z) data on to the plane and write the resul...

7일 전 | 2

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How to get the max orthogonal (perpendicular) distances from a set of coordinates
I created an alternative to polyxpoly here, https://www.mathworks.com/matlabcentral/fileexchange/93470-intersections-of-multipl...

9일 전 | 1

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Intersections of multiple 2D lines or line segments
Compute the intersection of a reference line (or line segment) with a polyshape boundary or with a batch of other line segments....

9일 전 | 다운로드 수: 5 |

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problem with VPASOLVE and FSOLVE
No, your equations don't have closed-form solutions. In any such situation, you will have to provide an accurate initial guess t...

10일 전 | 0

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3D matrix with equation
If it helps, I need to sum over index i afterwards, so this will reduce the dimensions again afterwards. Don't multiply-then-su...

10일 전 | 0

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Fmincon gives Exact the same Answer as the initial guess
Because of the round() operations, your objective function is locally flat (i.e., has zero gradient) almost everywhere. Therefor...

11일 전 | 1

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why hough transform detects more lines while there is only one line?
Because your line is actually not a line, but rather a tube with non-zero thickness, there are multiple thinner lines that will...

11일 전 | 0

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Create sperate matrices for all unique values in the 3rd column of a cell array
Well, I won't talk about creating separate arrays because it's bad, but here's what you could do which wouldn't be bad: initia...

11일 전 | 0

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