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.

Statistics

All

View badges

Content Feed

Answered
curve fitting of two equation to two data sets simultaneously
lsqcurvefit will do it. x=x(:); G1=G1(:); G2=G2(:); %ensure column vectors I=logical(x); b0=mean(G1(I)./G2(I)./x(I)); %In...

2 dagar ago | 0

Answered
table from the variable from the loop
j=0; for w=W_takeoff:-50:W_landing j=j+1; V(j,1) = sqrt(2*w/rho/S/cl_max); D(j,1) = 0.5 * rho * V(j) * ...

3 dagar ago | 0

| accepted

Answered
How to concatenate an array?
dataTT=[]; while true dataTT = [dataTT, read(MQTTSignal)]; str = dataTT(end).Data; ... end

3 dagar ago | 0

Answered
How to divide 256X256 matrix into sixteen 16X16 blocks?
You can download mat2tiles from, https://www.mathworks.com/matlabcentral/fileexchange/35085-mat2tiles-divide-array-into-equal-...

3 dagar ago | 1

Answered
I'm having trouble with convolution1dLayer
You need a sequenceInputLayer rather than a featureInputLayer. Also, the dimensions of the training data must be re-organized. ...

3 dagar ago | 0

Answered
Error on convolutional layer's: input data has 0 spatial dimensions and 0 temporal dimensions.
You need a sequenceInputLayer rather than a featureInputLayer. Also, the training data must be re-organized so that spatial dime...

3 dagar ago | 0

Answered
The training images are of size 224×224×3 but the input layer expects images of size 224×224×1.
imageInputLayer([224 224 3])

3 dagar ago | 0

Answered
How to define a step in the design interval using an optimization algorithm?
You can constrain an optimization variable to integers with the intcon argument. Then, you can multiply this variable by some sc...

4 dagar ago | 0

| accepted

Answered
Nearest Points in a Point Cloud
See pdist2, knnsearch, and rangesearch.

4 dagar ago | 1

Answered
Con2vert with 5 dimensions Error: Arrays have incompatible sizes for this operation.
I recommend using lcon2vert instead, A = [0 1 0 1 1; 1 0 0 0 0; -1 -3 1 -3 0; 2 0 -1 3 -6; 0 -1 0 0 0; 0 0 -1 0 0; 0 0 0 -1 0; ...

4 dagar ago | 1

| accepted

Answered
Graphing several curves of a variable for various values of a parameter
%Plotting on command window BETAS=[0, 0.2, 0.4, 0.6, 0.8]; for i=1:numel(BETAS) beta=BETAS(i); [t,y] = ode23s(...

5 dagar ago | 1

| accepted

Answered
removing one-voxel bridges between clusters?
Perhaps using imopen?

5 dagar ago | 0

Answered
Improving efficiency and runtime to use a binary mask to sort another set of XY coordinates?
binaryMask = zeros(1868); %determine center of the circle and radius y_center = 921; x_center = 921; radius = 150; [xx, yy]...

5 dagar ago | 1

| accepted

Answered
I'd like to merge two different tables on matlab, how do I do that?
Time1 = ["t1";"t2";"t3"]; value1 = [374; 164; 476]; value2 = [2455;5478;2354]; value3 = [53782;35683;24682]; table1 = table(...

5 dagar ago | 0

Answered
Faster way of appending data to large struct array
That is a quite a bit of data. Even in single precision, the array will consume ~3 GB. Ths should be faster, though. stats=nan(...

6 dagar ago | 0

| accepted

Answered
Constrained Optimization Problem With Obj Function Which Is Numerical Solution To A System Of ODE's
Perhaps you might use fmincon as follows: A=kron( eye(4) , ones(1,52)); b=[300;10;1;1]; %summation constraints Aeq=[]; beq=[];...

6 dagar ago | 0

Answered
Problem with nonlinear objective function
prob.Objective.OF2 = "max"; "max" is just a string. There is no optimization expression that can be interpreted from it.

6 dagar ago | 1

| accepted

Answered
Sum two matrices shifted by a non integer number?
Because of the linearity of interpolation, you should not interpolate each matrix. You should sum the matrices first, then inter...

6 dagar ago | 0

| accepted

Answered
Optimising my data importer for large datasets
I don't see any pre-allocation of udata. Also, nothing is being done with x, so it will cut down on time if you don't create it....

6 dagar ago | 0

Answered
Calculate 3D gradient of data corrisponding to a non-uniform grid
I would just compute the Jacobian matrix of the spherical to cartesian coordinate transformation and multiply the spherical grad...

6 dagar ago | 0

| accepted

Answered
Write the f(c) as an anonymous function
Is this correct? There is no need for abs(). Also, your division and exponentiation operations need to be element-wise, f = @...

6 dagar ago | 1

| accepted

Answered
3 subplots with the bottom one split in 2 vertically?
Is this what you mean? close all x = -10:0.01:10; y = cos(x); ax=subplot(2,2,[1,2]); axis square plot(x,y) ax.Position...

6 dagar ago | 0

Answered
Find the elements of array with the difference between one of the remaining elements less than specified
A=[1 18 25; 26 30 11; 5 31 20]; thresh=2; [m,n]=size(A); p=m*n; D=abs( A(:)-A(:)' ); D(1:p+1:end)=inf; [I,J]=find(resh...

8 dagar ago | 1

| accepted

Answered
Create unit vector for every vector in 3d array
normalize(yourArray,1,'n')

8 dagar ago | 0

| accepted

Answered
Create multidimensional rotation matrix
howbig=541; [aclon,aclat]=deal(rand(howbig,1)); %fake input data aclon=reshape(aclon,1,1,[]); aclat=reshape(aclat,1,1,[]...

8 dagar ago | 0

| accepted

Answered
How to added a attention layer in a CNN model in MatLab?
This looks relevant: https://www.mathworks.com/matlabcentral/answers/1743390-how-to-create-an-attention-layer-for-deep-learning...

8 dagar ago | 0

Answered
How to conditionally define a learnable property?
If you really must have a layer with different properties, based on a conditional flag setting, it would probably be better to ...

9 dagar ago | 1

Answered
Combine 3 fig. graphs in one plot to compare each other
Suppose ax is a vector of axes handles to all of your separate plots. Then, you could re-parent the axes to a TiledChartLayout i...

9 dagar ago | 0

| accepted

Answered
Optimization problem with cost function containing definite integral with one endpoint being part of the solution vector
You've written your functions in terms of 2 arguments (p,S), whereas fseminf expects all the unknowns to be part of one argument...

9 dagar ago | 0

| accepted

Answered
Tensor creation like "pageTensorprod"?
Is there an easier way? The resulting code lacks readability in my opinion. Probably not, but regardless, readability shouldn't...

9 dagar ago | 0

| accepted