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Matt J


6,141 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Can someone propose some code that will "connect the dots" using circular arcs?
The spline plotting that we came up with in our previous conversation looked like this for i=1:N ...

3 hours ago | 0

Answered
interp1 fails to interpolate correctly
X needs to be montonically increasing (or interp1 will pre-sort the data so that it is).

4 hours ago | 0

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Answered
Using polyfit and polyval functions with data
I wonder if what you are really trying to do is a fillmissing operation, instead of a linear fit to the data, a=[1;2;3;4;5;nan;...

7 hours ago | 0

Answered
Using polyfit and polyval functions with data
To do what you were after in your post, you need to fit with the NotMissing data, but then apply the fit at all days, a=[1;2;3;...

7 hours ago | 1

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Answered
integers to English phrase
As a further hint, consider the following version, which is almost what you want function S = convert_to_words(number) ones...

2 days ago | 0

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Answered
Create an array of handle objects using for-loop
Undoubtedly, you meant to have for i = 1:-0.1:0.9 for j = 1:-0.1:0.9

2 days ago | 0

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Answered
Optimise the problem question
You should be using linprog to solve this problem. It does not require a starting point x0. I don't see any need for equality co...

2 days ago | 0

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How I do evaluate a function handle in other function handle
What you probably have to do is use ode45 or similar to solve the differential equation dy/dx = f(x,y) on some interval. Then, f...

2 days ago | 0

Answered
Extract submatrix from matrix.
>> S=regionprops(yourMatrix>0,'Image'); >> S.Image ans = 2×2 logical array 1 1 1 1 ans = 2×3 lo...

3 days ago | 1

Answered
Update graph (Graph Theory)?
Perhaps like this, hold on H = subgraph(G,idx); %new part of graph plot(H,'Layout','force','XData',___, 'YData',_____) ...

3 days ago | 0

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Answered
fit options in a parfor loop
A guess as to why this might be happening is that fitoptions objects don't seem to implement proper save/load behavior, as indic...

3 days ago | 2

Answered
Something strange in MATLAB
Chances are the issue is not in the code, but in the new data that you have supplied as input. For some reason, this input data ...

3 days ago | 0

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How I do evaluate a function handle in other function handle
I think this line needs to be g=@(x,y) f(x,y)*p_y(f,x,y) + p_x(f,x,y);

3 days ago | 0

Answered
How to average more than 50 3D matrices using nanmean
Here's what I would do, I suppose. It assumes each of your .mat files stores the volume under the name 'a'. Summation=0; NCoun...

3 days ago | 2

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Answered
The best way to code this optimization problem
I have matlab 2013b Because the array sizes are fairly small here, the easiest thing might be to use my func2mat submission to ...

3 days ago | 0

Answered
Is there any way to fill this shape?
I=imread('shapes.jpg'); % to extract orange color A=(I(:,:,1) >= 245 ) & (I(:,:,1) <= 255) & ... (I(:,:,2) >= 121 ) & (I(:,:...

3 days ago | 0

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Answered
How to use options in fsolve
I know that i have to do fsolve(@(x) myfunz,x0,options) I don't think so. The exit message says "Equation solved". Another ...

3 days ago | 0

Answered
The best way to code this optimization problem
It should be very straightforward using the problem-based solvers in the Optimization Toolbox, https://www.mathworks.com/help/o...

4 days ago | 1

Answered
how do i create a random matrix with set size yet the numbers are in a range from 0-9
randi([0,9],4,6) %random integers or 9*rand(4,6) %non-integers

4 days ago | 0

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Answered
Error while using blockproc. Matrix dimensions must agree.
Matrix dimensions must agree. Error in dct (line 76) b = W .* fft(y); It would appear that W and y are not the same size....

5 days ago | 1

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Answered
Form a 3D matrix for a 2d matrix
NewM3D = reshape(ExitVector,size(M3D));

5 days ago | 0

Answered
how can i bound rate of changes (dx/dt) in fmincon optimization?
See https://www.mathworks.com/matlabcentral/answers/490758-limit-on-the-change-rate-of-the-variable-in-fmincon-function#answer_...

5 days ago | 0

Answered
Limit on the change rate of the variable in fmincon function
You would build linear inequality matrices like the following. E=diff(eye(numel(u))); A=[E;-E]; b=[ub(:);-lb(:)]; %linear ...

5 days ago | 1

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Answered
Multiplication in cell arrays
result = cat(3,precip{:}).*reshape(numbers,1,1,[]); There seems little reason either for precip to be a cell array or to turn t...

5 days ago | 0

Answered
Regular expression for 1*1 cell array
c='<string_attribute name="country"><s>CHINA5</s></string_attribute>'; out=extractBetween(c,'<s>','</s>'); >> out{1} an...

5 days ago | 1

Answered
Weighted fit with lsqcurvefit and (ideally) multistart?
Just apply whatever weights you want to the objective and to your ydata, fun=@(x,xdata)kinetics_full(x,xdata).*sqrt(weights); ...

5 days ago | 0

Answered
Rotate matrix with interp2
This might be what you want. [X,Y]=meshgrid(x-mean(x),y-mean(y));

6 days ago | 0

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Answered
Finding angle of rotations from a given unit vector to rotate a given vector using those angle to align with the previous unit vector
The following might be what you're looking for. It uses my AxelRot utility from the File Exchange https://www.mathworks.com/mat...

6 days ago | 0

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Answered
Nested For Loop for 2D Matrix
I vaguely wonder whether you are just re-inventing convolution result = conv2(Matrix,staticMatrix,'valid');

6 days ago | 0

Answered
Nested For Loop for 2D Matrix
So then you want to extract random 51x51 submatrices? If so, then, I=sort(randperm(600,51)); J=sort(randperm(1000,51)); sub...

6 days ago | 0

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