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Matt J


Last seen: Today 2009 以来アクティブ

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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Optimisation functions: Skipping iterations if objective function returns an error or cannot run completely
Basically, the option available to you is to return inf from your objective when an error condition is reached. Some optimizatio...

約7時間 前 | 0

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fill a vector (efficiently) with values specified by matrix and multiple vectors
M=reshape(1:8,2,2,2);N=10; x=(rand(N,1)>0.5)+1;y=(rand(N,1)>0.1)+1;z=(rand(N,1)>0.1)+1; OUT=M( sub2ind(size(M),x,y,z) ...

約7時間 前 | 0

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Interpolating points in a 3D space with one line
You can use linear3dFit() from this FEX submission https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-t...

1日 前 | 1

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how to handle soft weight constraints in neural network
If you wish to train with standard unconstrained stochastic gradient descent algorithms, you will probably have to make a custom...

1日 前 | 0

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Convert decimal and negative values ​​to integers
Something like this, perhaps? a = 0:pi/100:2*pi; x=cos(a); y = sin(x); fcn=@(z)round(rescale(z,0,intmax('uint16'))); pl...

1日 前 | 0

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why do we need to flip kernel before using conv2 in CNN?
The field of neural networks uses the term "convolution" loosely. There are other differences as well. We also know that in trad...

1日 前 | 0

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Applying the Nonlinear Least Squares Method to Minimize the Objective Function to Find the Parameters of the Equation
Your code makes strange assumptions about the output syntax of lsqnonlin. [x,resnorm,residual,exitflag,output,lambda,jacobian] ...

1日 前 | 0

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Trying to solve a matrix with four equations and four unknowns. Should be three non zero terms.
You cannot paste a function definition into the command window. Put it in a file and run it in the Maltab editor. Also, you are ...

2日 前 | 0

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How I can separate the data points by line?
You could use fitclinear. To illustrate, I will use fabricated data: %synthetic data N=500; Resistivity=rand(N,1); Porosity=...

2日 前 | 0

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Create a sliding window
matrix=reshape(vector,5e5,[]) This gives a matrix whose i-th window is matrix(:,i). How best to process that, though, depends o...

3日 前 | 0

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A*1 and A+0 could be faster.
My sense of things is that, in the situations where you would care about such special case optimizations, you would know in adva...

4日 前 | 1

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Add dimensions to a matrix
[RHSval,kprimeind] = max(RHSvec,[],2,'linear'); kdpolind(act,kprimeind)= vector_that_is_51x1

4日 前 | 0

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Why do I receive the array indices must be positive intergers or logical values
You haven't provided the input necessary to run your code, but it looks like tempo_fix-60 could be <=0.

4日 前 | 0

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Calculate the value of an area around a known co-ordinate
mean(Thermal(y-1:y+1,x-1:x+1),'all')

4日 前 | 0

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Interpolation of the values of points on the surface created by convex hull
For example, was the question targeted at sampling new points on the surface...? Assuming that's the correct interpretation, th...

5日 前 | 0

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how to range data and find maximum value for each range by using loop
AB=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16; 10 5 7 8 3 18 20 3 6 66 2 14 39 40 4 20].'; [maxval,i]=max(reshape(AB(:,2),4,[]),...

5日 前 | 0

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Generate Field Names from Variables While Accessing Elements of a Nonscalar Structure Array
Why not a 2D struct array, R(nDriver,1).LapData(nLap).LapTime R(nDriver,2).LapData(nLap).LapTime R(nDriver,3).LapData(n...

5日 前 | 0

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How to find the index of a particular child when using use parallel = True option in genetic algorithm optimizer?
If you have the Parallel Computing Toolbox, set UseParallel=false and UseVectorized=true. Then, inside your objective function a...

5日 前 | 1

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How can i solve this cost function?
v = [(1 / (0.47 * 0.94 * 1500)^2) (1 / (0.47 * 0.94 * 1700)^2) (1 / (0.47 * 0.94 * 2000)^2) (1 / (0.47 * 0.94 * 2200)^2)]; delt...

6日 前 | 1

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Text comparisons no longer work with arrays in 2022a
There's been no change. cell arrays containing character vectors still work: contains({'dog','fish','cat'},'cat') What does no...

7日 前 | 1

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How to find the constant of a line function
Evaluate the function at x=0.

7日 前 | 0

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Min of each column of a sparse matrix?
result = -log( max( spfun(@(x)exp(-x), yourMatrix) ,[],1) );

7日 前 | 0

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Create random numbers inside a specific plane in xy plane
I don't understand how you are specifying your parallelograms. However, one way is to use ndgrid and then apply a shear: [X,Y]=...

7日 前 | 0

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Generating all unique binary vectors of length N given certain criteria
N=5; A=triu(ones(N)); B=~eye(N); B=B(2:end-1,:); c=nchoosek(2:N-1,2); C=(1:N); C=C<c(:,1)|C>c(:,2); result=...

7日 前 | 0

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How to join or merge two Image Data Stores?
Perhaps by wrapping them in a TransformedDataStore (R2019a and higher), imdsnew = transform(imds1,imds2, @(x) x)

7日 前 | 0

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Can i continue to run my matlab programs even when the computer screen is locked using Win+L
Yes, it will continue to run.

7日 前 | 0

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how can I have a perfect rect function as the result of applying fft on sinc function?
I want exactly a rectangle like what we have in theory. The FFT of a sinc function is not a perfect rect, even in theory. The ...

8日 前 | 1

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Plotting from function per for-loop iteration
If you want new figure windows for each plot, don't specify a number for them: figure scatter(x,y) figure scatter(x+y,y)

9日 前 | 1

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How to find intersection points of multiple line segments in 3D?
If you generate them randomly, they will not intersect. However, generatig and plotting them is no problem, numlines=5; for ...

9日 前 | 0

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