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 ...

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 ...

alrededor de 2 horas 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).

interp1 fails to interpolate correctly

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

alrededor de 3 horas ago | 0

| accepted

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;...

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;...

alrededor de 5 horas 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;...

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;...

alrededor de 5 horas ago | 1

| accepted

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...

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 días ago | 0

| accepted

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

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 días 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...

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 días ago | 0

Answered

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...

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 días 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...

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 días 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',_____) ...

Update graph (Graph Theory)?

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

3 días 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...

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 días 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 ...

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 días ago | 0

Answered

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);

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 días 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...

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 días 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 ...

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 días 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(:,:...

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 días 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 ...

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 días 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...

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...

3 días 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

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

3 días ago | 0

| accepted

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....

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....

4 días ago | 1

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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_...

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 días 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 ...

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 días 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...

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 días 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...

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 días 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); ...

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 días ago | 0

Answered

Rotate matrix with interp2

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

Rotate matrix with interp2

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

6 días ago | 0

| accepted

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...

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 días ago | 0

| accepted

Answered

Nested For Loop for 2D Matrix

I vaguely wonder whether you are just re-inventing convolution result = conv2(Matrix,staticMatrix,'valid');

Nested For Loop for 2D Matrix

I vaguely wonder whether you are just re-inventing convolution result = conv2(Matrix,staticMatrix,'valid');

6 días 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...

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 días ago | 0

| accepted