Matt J

Last seen: Today

7,455 total contributions 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.

Contact

Matt J's Badges

View details...

Answered
computing the cumulative matrix with some conditions
Is this what you want? T=[0, 2, 4, -5] ; result=cumsum(T(AR))

2 hours ago | 0

Answered
Finding the sum of the first n primes and to use a while function
if isprime(i)

8 hours ago | 0

Answered
intersection area of 3 or more rectangles
If you put your rectangles in the form of a polyshape vector (I'll call it polyvec), then it is very easy: Area = area(intersec...

1 day ago | 0

Answered
overall area of intersecting rectangles
If you put the rectangles in the form of a polyshape vector, poly, then it is quite easy: Area= area(union(poly));

1 day ago | 0

Answered
Concatenate matrices not the same size - without NaN
Is there an existing function for this There is now: a=NaN; C = padcat(a, [1 2 3; 4 5 6; 7 8 9] , [1 2; 3 4] ) functi...

1 day ago | 1

| accepted

Answered
fsolve terminate far before finding answer when using TolFun option
Can anyone help me to know how should I solve this issue You should make TolFun a lot smaller. Note that x_solution and TolF...

1 day ago | 0

Answered
Shift columns of a matrix with different values
A = [10, 12, 14, 11; 8 , 10, 13, 10; 7 , 8, 12, 8; 6 , 7, 10, 7; 5 , 6, 8, 6; 3 , 5, 7, ...

2 days ago | 0

Answered
Shift columns of a matrix with different values
A = [10, 12, 14, 11; 8 , 10, 13, 10; 7 , 8, 12, 8; 6 , 7, 10, 7; 5 , 6, 8, 6; 3 , 5, 7, ...

2 days ago | 1

Answered
Troubles with MATLAB genetic algorithm nonlinear constraint function
If you re-run your code after executing, >>dbstop if caught error you will be able to trace the problem.

2 days ago | 1

Answered
How to fit an exponential curve? error: Dimensions of arrays being concatenated are not consistent
Did you mean, [[ones(size(time)); -exp(-time)].\E_f; ones(size(time))]

5 days ago | 0

Answered
Why does subclassing a numeric type break its use as a property of a custom class?
1. Why does my code work for double but not ExtendDouble? The ExtendDouble example is old. It's subsasgn() method was not writt...

5 days ago | 2

| accepted

Answered
How can I create a vector like this : X = [1, 2, 1, 2 ......
X=ones(1,n); X(2:2:end)=2;

6 days ago | 2

Answered
For loop with nested if loop
Perhaps this is what you want, condition=( (HipVel > .0014) & (KneeAngle < minAngle); drop_time = VJ_P1_T1.data( condition ...

6 days ago | 0

Submitted

whosGPU
Provides WHOS-like output for gpuArray variables in the current workspace.

6 days ago | 1 download |

Answered
General conic curve fit with constrained coefficients
Here's a basic analytical fit, using the tools in this File Exchange package: [xy,T]=conicFit.homogNorm([x(:),y(:)].'); x=xy...

6 days ago | 0

| accepted

Answered
How to check the Bytes of gpuArray?
See whosGPU (Download).

7 days ago | 0

Answered
Obtain memory usage and class for GPU variable
See whosGPU.

7 days ago | 0

Answered
GPU equivalent of "whos" or "feature memstat" ?
See this File Exchange submission, https://www.mathworks.com/matlabcentral/fileexchange/88024-whosgpu

7 days ago | 0

Answered
Fontsize using Latex interpreter
You can set fontsizes as shown here, https://www.mathworks.com/matlabcentral/answers/350036-latex-interpreter-with-sentences-an...

7 days ago | 0

| accepted

Answered
how to write a bisection loop?
Because y is a polynomial, it is much more expedient to use roots(), y = [(-0.50598*10^-10) , (0.38292*10^-7) , (0.74363*10^-4)...

7 days ago | 0

Answered
How to compare two strings with different sizes?
Another guess: a = 'AAGCTACGC'; b = 'ACGCAA'; match = ( a(:)==b )

7 days ago | 0

| accepted

Answered
feval distorted in ga after using nonlinearconstr
The main thing I see that looks out of place is that is the role of SSP_restored_1st15day. If it is a variable, I cannot see wh...

8 days ago | 0

| accepted

Answered
How can I plot ln(1-x)/x using colon operator?
x = linspace(-10^(-15),10^(-15),300); f = log(1-x)./x; plot(x,f)

9 days ago | 0

| accepted

Answered
How to plot a graph that I already have in on paper
Yuo can use this, https://www.mathworks.com/matlabcentral/fileexchange/7173-grabit to extract the points on the curve, which y...

9 days ago | 0

Answered
Check if nullspace is contained in another + finding intersection of 2 nullspaces.
Hints: (1) Consider [null(A), null(B)] (2) Consider [A;B]

9 days ago | 1

Answered
Linear programming code not showing the solution
As long as your feasible set is bounded, you can use this FEX submission instead, https://www.mathworks.com/matlabcentral/filee...

9 days ago | 0

Answered
exp(-b/x) fit, inf problem when fitting
When x goes to zero, y should go to zero as well since anything power negative infinity is zero. Only if b>=0. g = fittype('ex...

10 days ago | 0

| accepted

Answered
accumulating unique indices in array
B = histcounts(A,1:max(A)+1)

10 days ago | 0

Answered
Sum subarrays of a Matrix.
Using sepblockfun https://www.mathworks.com/matlabcentral/fileexchange/48089-separable-block-wise-operations out=sepblockfun(A...

10 days ago | 1

Question

Recover former state of Matlab Editor
I had quite a few files open in the Matlab Editor, but then inadvertently closed the editor window. Is there any way to re-open ...

12 days ago | 1 answer | 0