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Matt J


Last seen: Today
6 602 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Adding two linear inequality constraints in Optimization toolbox
But the optimization algorithm should still be able to handle it, right? Can it be accomodated in Aineq and bineq? One way you ...

3 dagar ago | 0

Answered
Interpolate values to the nearest 0.25 and create indices for these values
vals=linspace(0,8,32+1); rp1(:)=interp1(vals,vals, rp1(:),'nearest')

3 dagar ago | 0

| accepted

Answered
How to extend line of best fit to find x intercept ?
roots(p)

3 dagar ago | 1

| accepted

Answered
Operator '-' is not supported for operands of type 'cell'.
Check the contents of ATtable{1,3} and ATtable{1,5}. I bet they're not numbers.

3 dagar ago | 0

Answered
How to draw a graph for function with constraints?
fimplicit(@(x,y) x.^2 + 4*x.*y +5*y.^2 - 10,'r'); hold on; fcontour(@(x,y) 3*x+4*y) ; hold off

3 dagar ago | 0

| accepted

Answered
Unable to perform assignment because the size of the left side is 98-by-50 and the size of the right side is 98-by-32.
Make the right hand side and the left hand side the same size.

3 dagar ago | 0

Answered
Repeatedly interpolating from scattered to regular grid with varying sample values
You can change the Values property of the scatteredInterpolant object. That can eliminate significant object re-building time, a...

4 dagar ago | 1

| accepted

Answered
Constraint function in optimization toolbox
As far as I can see from your code, the mass flow constraint is linear in para. You would use the linear inequality constraint a...

4 dagar ago | 0

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Answered
Creating optimization constraint with loop is too slow
The problem-based framework is not built for speed. It's built to make setting up small problems easy. So, it's already question...

4 dagar ago | 0

| accepted

Answered
Does anyone know how to use the matlab to calculate the minimu distance between a point outside oval and the oval surface?
You can use trustregprob from the File Exchange https://www.mathworks.com/matlabcentral/fileexchange/53191-quadratic-minimizati...

5 dagar ago | 0

Answered
coefficient determination of two variables
lsqcurvefit would be one choice, https://www.mathworks.com/help/optim/ug/lsqcurvefit.html Note that your equation can be reorg...

6 dagar ago | 1

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Answered
How should I store the value of f(x) in the output of fsolve?
>> norm(fval).^2 ans = 3.2953e-13

6 dagar ago | 0

Submitted


Extract linearly independent subset of matrix columns
Loop-free code routine to find a maximal subset of linearly independent columns in a matrix

6 dagar ago | 3 downloads |

Answered
counting how many times a certain value is repeated in a fixed interval
If you have the Image Processing Toolbox, reg=regionprops(X,'Area'); score = sum(structfun(@(a) floor(a/2), reg))

7 dagar ago | 0

Answered
How to get the minimum number of rows that, if removed, reduces the rank.
Well, if A were full rank, it's rank would be min(size(A)); So, perhaps you want the difference between this and the actual ra...

7 dagar ago | 0

Answered
splitting a matrix into vectors
See here, https://www.mathworks.com/matlabcentral/answers/554587-making-a-row-vector-from-a-nxn-matrix

7 dagar ago | 0

Answered
Removing zeroes from 3d matrrix
reshape(nonzeros(Fx),11,2,3);

7 dagar ago | 0

Answered
How to divide an images into two parts?
Use the save command, save filename Image1 Image2

9 dagar ago | 1

Answered
How to disable a toolbox
Add all your code to the top of the Matlab path using addpath https://www.mathworks.com/help/matlab/ref/addpath.html#btpdm64-5 ...

9 dagar ago | 0

Answered
Making a row vector from a nxn matrix
>> BCD=num2cell(A,2); >> BCD{:} ans = 1 2 3 ans = 4 5 6 ans = 7 8 ...

10 dagar ago | 0

| accepted

Answered
Using a for loop to find max value for each row in matrix
Just use max() >> A=rand(1001,251 ); >> rowmax=max(A,[],2);

11 dagar ago | 0

| accepted

Answered
why lsqlin constraint, lsqnonneg do not answer correctly
To get reasonable results, the problem needs to have a reasonable solution.

11 dagar ago | 0

Answered
How to get bounding boxes around rectangular rooms which are rotated by some angle ?
You could also use this FEX file to get the vertices of each room, https://www.mathworks.com/matlabcentral/fileexchange/74181-f...

11 dagar ago | 0

| accepted

Answered
Numerical operations are slow on class properties versus in workspace
It is the repeated M-coded function calls that are slowing you down. Implement the whole loop in a single function call: ...

12 dagar ago | 0

Answered
How to find coordinates of a rotated room in a floor plan?
Use imerode to get rid of everything except the thicker lines demarcating the walls. Then use houghlines to fit line segments to...

12 dagar ago | 0

Answered
passing an array value to fmincon
This page talks about passing known parameters. They apply to any variables you might wish to pass, be they arrays, scalars, or ...

12 dagar ago | 0

Answered
Calculate radius from scatter plot
You could try using clusterdata to find the big concentration of points. Then minboundcircle from the File Exchange to get the r...

12 dagar ago | 1

Answered
help!! not using repmat()
Another option would be, kron(ones(row,col),arr)

13 dagar ago | 0

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Answered
Fit a polynimial function on a image curve
A sixth order polynomial won't give a very good fit, but here is how you could code it: load waveImage A [I,J]=find(medfilt...

14 dagar ago | 0

Answered
Why do I get the error "Undefined function or variable" 'getmapping' ?
Probably because getmapping() is a function that you don't have.

14 dagar ago | 0

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