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Matt J


Last seen: Today
6.608 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Perform processing over each row of table starting from first non-zero element in that row
Your question implies that all elements of the table are numeric., e.g., T = 5×3 table Var1 Var2 Var3 ...

ongeveer 11 uur ago | 0

Answered
Returning values from Blockproc
You could use mat2tiles https://www.mathworks.com/matlabcentral/fileexchange/35085-mat2tiles-divide-array-into-equal-sized-sub-...

ongeveer 17 uur ago | 0

Answered
Column space of a matrix
You can use this FEX submission, https://www.mathworks.com/matlabcentral/fileexchange/77437-extract-linearly-independent-subset...

ongeveer 18 uur ago | 0

Answered
How to label sorted variables
Maybe what you want: >> labels=string({"A","B","C"}); >> x = [1,1,3; 2,2,1; 3,3,2]; >> labels(x) ans = ...

ongeveer 18 uur ago | 0

Answered
FSOLVE requires all values returned by user functions to be of data type double
The result I get from this is, xc = 0.1000 0.1500 0.2000 0.2500 0.3000 0.3500 0.4000 ...

ongeveer 18 uur ago | 0

| accepted

Answered
Matrix 2-norm Condition number
sadly this isn't the first tine that the equal function fails with me and don't know the reason. The isequal() function didn't ...

ongeveer 20 uur ago | 0

| accepted

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 ...

4 dagen 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')

5 dagen ago | 0

| accepted

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

5 dagen 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.

5 dagen 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

5 dagen ago | 0

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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.

5 dagen 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...

5 dagen ago | 1

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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...

6 dagen 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...

6 dagen ago | 0

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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...

7 dagen ago | 0

| accepted

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...

7 dagen ago | 1

| accepted

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

8 dagen 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

8 dagen 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))

8 dagen 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...

8 dagen 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

9 dagen ago | 0

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

9 dagen ago | 0

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

11 dagen 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 ...

11 dagen ago | 0

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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 ...

11 dagen 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);

13 dagen ago | 0

| accepted

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

13 dagen 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...

13 dagen 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: ...

14 dagen ago | 0

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