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Matt J


5,678 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
How do I display the terms of a binomial expansion (x+y)^n ?
One way, n=4; e=0:n; C=arrayfun(@(i)nchoosek(n,i),e); sprintf('%d*x^%d*y^%d ',[C;e;n-e]) '1*x^0*y^4 4*x^1*y^3 6*x^2*...

1 hour ago | 0

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Answered
Nonlinear data fitting using lsqnonlin for multiple variables
There's nothing special involved, a=___ b=___ y=___ x0=___ xlsq =lsqnonlin(@(x) modelfun(x,a,b,y), x0) function F=mode...

2 hours ago | 0

Answered
Error "Too many output arguments" from fmincon
Do you mean I choose 'on' for the option "GradObj'' and 'GradConstr' and need to switch them to 'off'? Either switch them off o...

16 hours ago | 0

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Answered
can any body find the mistake here? I am rotating the coordinates of the arc and then bringing it to its original position. but it is not coming back to its original position ????!!!!
Some observations, You never use a11,b11 anywhere. After rotating back, you perform a translation by x_origin, y_origin. In ot...

16 hours ago | 0

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Answered
Passing object instances.
Yes, you can. You can pass any variable to a function.

18 hours ago | 0

Answered
Help with lsqnonline VLE (vapor liquid equilibrium) data.
x = lsqnonlin(@(x) optim(x(1:6),x(13),x(14),R,T,B11,VV,x(7:12),vL,n1,n2,Pe),x0);

22 hours ago | 0

Answered
Valid indices are restricted in parfor loops
You need to get familiar with Sliced Variables and their restrictions. Basically, if you have an expression like state(expr,k) i...

22 hours ago | 2

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Answered
Find all combinaisons of sum of two vector that corresponds to the value of a third vector
tolerance=1e-6; [A,B,C]=deal(A(:),B(:),C(:)); %Make everything a column vector [Ar,Br,Cr]=deal(A,B.' , reshape(C,1,1,[]) )...

1 day ago | 0

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Answered
Concatenate Tables with/without "Join"
>> C = outerjoin(A,B,'Keys','Character','MergeKeys',true) C = 6×3 table Character Time1 Time2 ________...

2 days ago | 0

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Answered
Quadprog 'interior-point-convex' failure
Simply l2-normalizing the rows of A also seems to help, load('testData-Matt.mat'); opts = optimoptions(@quadprog,'Algorithm'...

3 days ago | 1

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Answered
Quadprog 'interior-point-convex' failure
I don't have a pre-R2016a Matlab release readily at hand, and so I cannot compare performance. However, if the problem is simply...

3 days ago | 0

Answered
how can i store the solution (3D mtarix) and its value for a population of N
So the question is how to store a set of 3D matrices? Why not use a 4D matrix Configs(:,:,:,1)=X1 Configs(:,:,:,2)=X2 ... C...

3 days ago | 0

Answered
creating a curve from XYZ points (centreline) and then split curve into new points
Use a curve fitting function, like lsqcurvefit().

3 days ago | 0

Answered
Every point on 2D surface is being transformed by unknown function. How to interpolate coordinates of any point on 2D surface knowing few of them.
If you have a model of the transformation the best approach would be to do a surface fit.

4 days ago | 0

Answered
What does this "fsolve" message tell me?
Does a function evaulation error of (5.95853e-15 ) is not enough for the solution to be correct? Only you can know the answer ...

5 days ago | 2

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Answered
Vector Comparison According to Entities
[~,~,n]=unique(sort(A,1).','rows'); n=n(:).';

5 days ago | 1

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Answered
different matrix size after 3D interpolation
You could just use imresize3, new_SPECT = imresize3(SPECT, [512,512,263])

5 days ago | 0

Answered
fit curves by smoothingspline
Shouldn't this be, plot(curve3,xx,Pattern3)

5 days ago | 0

Answered
Single-File Object-Oriented Script?
You could just create a static class method that runs what you would normally run in the workspace of the script, classdef some...

5 days ago | 0

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Answered
Is there the more elegant way to do this?
You don't need the switch block. You can just do, items = get(hObject,'String'); index_selected = get(hObject,'Value'); cm ...

5 days ago | 0

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Answered
How to find the transformation matrix for a plat knowing the old and new coordinates of 3 points on it ?
You could use this FEX file https://www.mathworks.com/matlabcentral/fileexchange/26186-absolute-orientation-horn-s-method

5 days ago | 1

Answered
Can you create an array of Constraints in an Optimisation MILP problem?
The error message you are getting occurs when you do things like this, x=optimvar('Xname',252,1); y=optimvar('Xname',252,1); ...

6 days ago | 0

Answered
Can you create an array of Constraints in an Optimisation MILP problem?
You can just write I=1:252; MymodelRP.Constraints.NewEnergyAllocation = ( Eih(I,1)+Eil(I,1)<=Cinew(I,1) );

6 days ago | 0

Answered
Find n closest nonzero pixels for every nonzero pixel in an image
Using this information, I need to find the 10 closest nonzero pixels (indexed with their correponding distances to the central p...

7 days ago | 0

Answered
Interpolate y-values of two data sets on the same axes
ht1=sortrows([height1(:),temperature1(:)]); %pre-sort ht2=sortrows([height2(:),temperature2(:)]); Height=ht1(:,1); Temperat...

7 days ago | 1

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Answered
Creating a vector from two points using 3 coordinates
I think this would complete your code. Times=1:10:length(Data.Time); J=numel(Times); F=nan(J,3); for j = 1:J ...

7 days ago | 0

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Answered
Illegal use of reserved keyword "switch"
Your switch block is not enclosed in a method...end block.

8 days ago | 0

Answered
Error using when cell2mat (with string characters)
Try char(Matrix) or string(Matrix)

8 days ago | 0

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Answered
Distance of a line by camera points
Well, I have no familiarity with the 3rd party Github library that you're using. However, it is a stereo camera class. So, it sh...

8 days ago | 0

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