Professional Interests: medical image processing, optimization algorithms

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Answered

Stop chatting, MATLAB!

Just a guess, but you might try going into Preferences>>General and unchecking the option to send telemetry info back to MathWor...

Stop chatting, MATLAB!

Just a guess, but you might try going into Preferences>>General and unchecking the option to send telemetry info back to MathWor...

14 hours ago | 0

Answered

How can we refer world coordinate to image coordinates??

You have world2Intrinsic() https://www.mathworks.com/help/images/ref/imref2d.worldtointrinsic.html

How can we refer world coordinate to image coordinates??

You have world2Intrinsic() https://www.mathworks.com/help/images/ref/imref2d.worldtointrinsic.html

3 days ago | 0

Answered

Cone constraints with mixed integer programming

My approach would be to reduce this to a 1-variable minimization over x(11) and solve that with fminsearch, [Combinations{1:10}...

Cone constraints with mixed integer programming

My approach would be to reduce this to a 1-variable minimization over x(11) and solve that with fminsearch, [Combinations{1:10}...

5 days ago | 1

Answered

Find nonzero elements in 5x5 matrix (diagonal, vertical, horizontal line)

For example, to search for a column string, A =[ 1 4 4 4 5 3 1 4 1 4 5 ...

Find nonzero elements in 5x5 matrix (diagonal, vertical, horizontal line)

For example, to search for a column string, A =[ 1 4 4 4 5 3 1 4 1 4 5 ...

5 days ago | 0

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Answered

How can I fit multiple lines through a common y-intercept?

p=[x(:).^[1,0] ,0*x(:); 0*x(:),x(:).^[0,1]] \[y1(:);y2(:)]; m1=p(1) b=p(2) m2=p(3)

How can I fit multiple lines through a common y-intercept?

p=[x(:).^[1,0] ,0*x(:); 0*x(:),x(:).^[0,1]] \[y1(:);y2(:)]; m1=p(1) b=p(2) m2=p(3)

5 days ago | 2

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Answered

fmincon very slow for a small scale problem

Don't use Symbolic Toolbox operations. Remove all the sym operations and just convert fnsum to a numerical objective function.

fmincon very slow for a small scale problem

Don't use Symbolic Toolbox operations. Remove all the sym operations and just convert fnsum to a numerical objective function.

5 days ago | 0

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Answered

Double summation of a matrix

The expression in your .jpg file, if it needs to be evaulated for all p,q would be SML=conv2(ML,ones(N+1),'same')

Double summation of a matrix

The expression in your .jpg file, if it needs to be evaulated for all p,q would be SML=conv2(ML,ones(N+1),'same')

6 days ago | 0

Answered

Prevent a figure/axis from being made current manually

Like Walter mentioned, setting the figures HandleVisibility to off seems to do the job.

Prevent a figure/axis from being made current manually

Like Walter mentioned, setting the figures HandleVisibility to off seems to do the job.

6 days ago | 1

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Answered

Double summation of a matrix

In recent Matlab, you can do sum(matrix,'all') or more generally you can do sum(matrix(:))

Double summation of a matrix

In recent Matlab, you can do sum(matrix,'all') or more generally you can do sum(matrix(:))

6 days ago | 0

Answered

Why Matlab tells the following A*A^T matrix is not a positive Semi-definite Matrix ?

Yes, it is positive semi-definite. But Matlab's ability to detect that is limited, because finite precision prevents it from com...

Why Matlab tells the following A*A^T matrix is not a positive Semi-definite Matrix ?

Yes, it is positive semi-definite. But Matlab's ability to detect that is limited, because finite precision prevents it from com...

6 days ago | 0

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Question

Prevent a figure/axis from being made current manually

Is there a way to disable the ability of the figure window to automatically become the current figure when a manual user action ...

6 days ago | 2 answers | 0

Answered

Why matlab live editor and matlab script gives different rank calculation result for the same matrix ?

Probably because you copy-pasted the values of M from the screen to one of the scripts.

Why matlab live editor and matlab script gives different rank calculation result for the same matrix ?

Probably because you copy-pasted the values of M from the screen to one of the scripts.

7 days ago | 0

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Answered

How to rotate 3D cube so that one face is normal to a given axis

If I can choose the missing rotation angle freely, then here is one solution. % Centre of system coords_source_xyz= [-0.5,...

How to rotate 3D cube so that one face is normal to a given axis

If I can choose the missing rotation angle freely, then here is one solution. % Centre of system coords_source_xyz= [-0.5,...

7 days ago | 0

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Answered

Fitting Data from a matrix to polynomial

A very relevant example: https://www.mathworks.com/help/curvefit/fit.html#bto_zh5-3

Fitting Data from a matrix to polynomial

A very relevant example: https://www.mathworks.com/help/curvefit/fit.html#bto_zh5-3

7 days ago | 0

Answered

How to solve a nonlinear equation?

[x,fval] = fzero( @(x) x^(8.5)+3*x.^2-3000,nthroot(3000,8.5))

How to solve a nonlinear equation?

[x,fval] = fzero( @(x) x^(8.5)+3*x.^2-3000,nthroot(3000,8.5))

7 days ago | 0

Answered

fsolve function give poor results for multiple equations

Your equations are linear, so there is no reason to be using fsolve. I was able to obtain the coefficient matrix A for your line...

fsolve function give poor results for multiple equations

Your equations are linear, so there is no reason to be using fsolve. I was able to obtain the coefficient matrix A for your line...

7 days ago | 0

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Answered

Why do I only have an output of zeros for the 1 X 800

We cannot run your code, but a good debugging strategy would be to pause execution at this line, Kr_eff = ((1./mso).*sum(S.*(Ks...

Why do I only have an output of zeros for the 1 X 800

We cannot run your code, but a good debugging strategy would be to pause execution at this line, Kr_eff = ((1./mso).*sum(S.*(Ks...

7 days ago | 1

Answered

Nonlinear inequality in GA optimization with integer constraints

In the code you have shown for POWER_CONSTRAINT(~), it does not make sense that POWER does not depend on the input, but rather o...

Nonlinear inequality in GA optimization with integer constraints

In the code you have shown for POWER_CONSTRAINT(~), it does not make sense that POWER does not depend on the input, but rather o...

7 days ago | 0

Answered

I know how to divide my 256x256 image into 16x16 blocks using mat2cell. Now I want to access those 16x16 blocks successively to further divide them into 4x4 blocks.

Using mat2tiles https://www.mathworks.com/matlabcentral/fileexchange/35085-mat2tiles-divide-array-into-equal-sized-sub-arrays ...

I know how to divide my 256x256 image into 16x16 blocks using mat2cell. Now I want to access those 16x16 blocks successively to further divide them into 4x4 blocks.

Using mat2tiles https://www.mathworks.com/matlabcentral/fileexchange/35085-mat2tiles-divide-array-into-equal-sized-sub-arrays ...

8 days ago | 1

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Answered

Generate a 100000x100000 matrix that takes less time and memory

Seems to me the whole code can be replaced by, function [a,ed] = Random_graph_genar_function(nodes, connectivity) a=logi...

Generate a 100000x100000 matrix that takes less time and memory

Seems to me the whole code can be replaced by, function [a,ed] = Random_graph_genar_function(nodes, connectivity) a=logi...

8 days ago | 0

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Answered

Randomized Groups of Array

Ex. I have 250 numbers and I want them in 50 groups of 5 reshape( randperm(250) , 5,50) or 25 groups of 10, reshape( randpe...

Randomized Groups of Array

Ex. I have 250 numbers and I want them in 50 groups of 5 reshape( randperm(250) , 5,50) or 25 groups of 10, reshape( randpe...

8 days ago | 0

Answered

How to solve explicit equation of ellipse

If you convert the ellipse to its polar representation https://en.wikipedia.org/wiki/Ellipse#Polar_form_relative_to_center tha...

How to solve explicit equation of ellipse

If you convert the ellipse to its polar representation https://en.wikipedia.org/wiki/Ellipse#Polar_form_relative_to_center tha...

8 days ago | 1

Answered

How to find the solutions to a set of linear equations?

You can easily trap the point where NaNs are introduced using >>dbstop if naninf https://www.mathworks.com/help/matlab/ref/dbs...

How to find the solutions to a set of linear equations?

You can easily trap the point where NaNs are introduced using >>dbstop if naninf https://www.mathworks.com/help/matlab/ref/dbs...

9 days ago | 0

Answered

Efficient number occurence count

In this situation, accumarray will be faster than histcounts, but still not as fast as the for-loop, tic; hc=accumarray(num(:)...

Efficient number occurence count

In this situation, accumarray will be faster than histcounts, but still not as fast as the for-loop, tic; hc=accumarray(num(:)...

10 days ago | 1

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Answered

Registation of two images in '.mat' format

With monomodal registration, it works fine for me, [optimizer, metric] = imregconfig('monomodal'); but I should mention that t...

Registation of two images in '.mat' format

With monomodal registration, it works fine for me, [optimizer, metric] = imregconfig('monomodal'); but I should mention that t...

10 days ago | 0

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Answered

construct a two level optimisation problem has fmincon solver for lower level and genetic algorithm for upper level

You are passing a variable called xl to LLConstraint(), but xl is not used anywhere within that function. The function is theref...

construct a two level optimisation problem has fmincon solver for lower level and genetic algorithm for upper level

You are passing a variable called xl to LLConstraint(), but xl is not used anywhere within that function. The function is theref...

10 days ago | 0

Answered

Efficient number occurence count

I want to efficiently count the number of occurences of numbers between 1-numel(num) in a Matrix If that's really what you want...

Efficient number occurence count

I want to efficiently count the number of occurences of numbers between 1-numel(num) in a Matrix If that's really what you want...

10 days ago | 0

Answered

Using fsolve with multiple unknowns

...but unsure on the syntax for a problem like this. The syntax does not change. It is simply that your equation expressions w...

Using fsolve with multiple unknowns

...but unsure on the syntax for a problem like this. The syntax does not change. It is simply that your equation expressions w...

10 days ago | 0

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Answered

Array value replace when change in row

A=randi([0,1],7,10); %Example [m,n]=size(A); [~,idx]=max(A,[],1); out = sparse(idx,1:n,1,m,n) ; A, full(out)

Array value replace when change in row

A=randi([0,1],7,10); %Example [m,n]=size(A); [~,idx]=max(A,[],1); out = sparse(idx,1:n,1,m,n) ; A, full(out)

10 days ago | 0

| accepted

Answered

Create column vector with same length as a matrix(6x6).

Taking the question literally, one solution would be, (1:6).' but I feel there must be missing information.

Create column vector with same length as a matrix(6x6).

Taking the question literally, one solution would be, (1:6).' but I feel there must be missing information.

10 days ago | 0