Matt J

Last seen: Today | Active since 2009

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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Answered
increase the thickness + hide some lines generated in the pie chart
What I would do is overlay another piechart on top of it (with transparent wedges, but thicker lines). load matrix_new.mat loa...

18 hours ago | 0

Answered
How can I fill the area under a curve with different colors?
One way: x=0:0.01:4; y=1-exp(-x); color={'g','y','r'}; edges=0:4; for i=1:3 r=(edges(i)<=x)&(x<=edges(i+1)); ...

19 hours ago | 0

Answered
curve fitting exponential function with two terms
You can also use fit()'s normalizer, x = [6500 6350 6000 5400 4500]; y = [0 0.25 0.5 0.75 1.0]; theFit=fit(x',y','exp2','N...

1 day ago | 0

Answered
curve fitting exponential function with two terms
You should normalize your x data % Curve Fit x = [6500 6350 6000 5400 4500]; x=(x-mean(x))/std(x); y = [0 0.2...

1 day ago | 0

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Matlab curve fitter error with exponential form with 2 terms
% Interior Square Footage x = [1500 1600 1750 1930 2250]; y = [0 0.25 0.5 0.75 1]; theFit=fit(x' , y', 'exp2','Lower',[0 0 ...

1 day ago | 0

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Answered
How to fit an ellipse to an image in matlab.
You can use ellipticalFit from this FEX download https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-too...

3 days ago | 0

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Copy a file to a parent folder
Is there a way to fun a script from inside the subfolder to copy the file up one level? Yes, but I wonder why you think the scr...

3 days ago | 0

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combination of two matrcies
S=log(kron(exp(4*L), exp(M)))

3 days ago | 1

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Answered
How do you build the matrix for finite difference 2D Laplace equation
Using func2mat from this download, https://www.mathworks.com/matlabcentral/fileexchange/44669-convert-linear-functions-to-matri...

3 days ago | 0

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Brace Indexing Not Supported when in matlab app designer but when transferred to matlab script, it works properly.
I also tried to use msgbox() just to see what is stored in app.StudentName. Why use msgbox()? Why not just pause execution and ...

4 days ago | 0

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How to optimise a specific equation in a model in order to fit the final curve of the model?
Yes, there is polyfit.

4 days ago | 0

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Computing on multiple notes with multiple cores
The problem is, that the outer loop has 10 repetitions and the inner loop 50 repetitions Combine the loops into one, i.e., inst...

4 days ago | 1

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Answered
Implicit expansion for griddedInterpolant
Use the grid vector syntax of griddedInterpolant: zq=J({xq,yq})

4 days ago | 1

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Answered
Applying an affine transformation of one image to another image
Use imregtform to do the registration instead. Then use imwarp to apply the transformation that imregtform gives you.

5 days ago | 1

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Answered
Using Optimizing Nonlinear Functions to find mutiple variations
There are also FEX downloads that can do gauss fitting for you, e.g., https://www.mathworks.com/matlabcentral/fileexchange/6911...

5 days ago | 0

Answered
How to find the position index of vector array
start=find(A(1,:),1,'first'); stop=find(A(1,:),1,'last');

5 days ago | 0

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Answered
Plotting Ellipsoids on XYZ graphs.
You can plot an arbitrarily oriented ellipsoid using this FEX download https://www.mathworks.com/matlabcentral/fileexchange/875...

5 days ago | 0

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Issue with gradient of interpolated data
Here are some applicable FEX submissions (which I myself have not used), https://www.mathworks.com/matlabcentral/fileexchange/8...

6 days ago | 0

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Elegantly refer to the second output from a function
data = (1:8)*100 result = data( argEval(2,@ismember,1, [0,1,2,3,4,5])) function out=argEval(n,fh, varargin) %Get the n-th...

6 days ago | 1

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for loop keeps putting out error
% Loop to generate garden layouts along the length for start_y = 0:spacing:garden_length % Plot the garden layout for ...

6 days ago | 0

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Find the volume of the region bounded between the planes x + y + 2z = 2 and 2x + 2y + z = 4 in the first octant.
Using this FEX download, https://www.mathworks.com/matlabcentral/fileexchange/30892-analyze-n-dimensional-convex-polyhedra [A...

6 days ago | 0

Answered
Reduce the number of elements tretamesh
This looks applicable, https://www.mathworks.com/matlabcentral/fileexchange/87112-isocut?s_tid=srchtitle in particular IsoCut...

6 days ago | 1

Answered
ImageDataStore, How to use to save Labels and 4D Matrices in for loop?
imageDatastores are provided for situations like that.

6 days ago | 0

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How to plot a shifted signal?
One way: t=linspace(0,2*pi); y=sin(t); plot(t,y,t-pi/2,y,'x'); legend Original Shifted

6 days ago | 0

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How to subtract 1 from a property of every instance of a class in an array?
If possible I would like to do this without using a FOR loop for speed. There is no way to do it faster than a for-loop, but th...

6 days ago | 0

Answered
select rows based on the value of the last column of the matrix
This solution requires only 1 sorting operation. A = [334 1358 175 3 335 1359 176 3 335 1359 175 1 336 1360 176 2 337 1361 ...

10 days ago | 1

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Answered
save each struct to vector-like format
I think you have a misunderstanding about what a struct is. None of the variables in your code are structs. However, the followi...

10 days ago | 0

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keep a firm column in scrolling
Perhaps put the still-column in its own separate table, but position them side-by-side so that they look like just one table.

10 days ago | 0

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Answered
How to append text and numbers into a title
start_month=12; start_day=1; mth = month(datetime(1, start_month, 1), 'Name'); % To get the name of the month title({'C. Beau...

11 days ago | 1

Answered
common legend and common for multiple plots
% Make up data: xivals = 1:10; intul = rand(1,10); intabsul = rand(1,10); intur = rand(1,10); intabsur = rand(1,10); %...

11 days ago | 0

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