Hello,
I am trying to analyse microstructural features in one of my image. Yet I have couple of problems on the image. First of all, one of my friends has denoised the image using python and he did not share the details of denosising. When I try to denoise image by myself, I cannot get close to his denosising so I am wodering what I should do and what he used for denoising so that he got such a clear image. I have added the image before and after denosising (hope you can see the zip file).
Also another question is that I was using the thresholded image to measure microstructural features like length, width and volume fraction of yellow and chunky purple ones via imageJ and python. I am wondering if I can do the same with Matlab in a better way. I know my thresholding could be better but with limited coding skills that is what I can do currently 🙂 So next question is how I can do a better thresholding to distinguish each phases which are gray, white and black in the original image

Thank you in advance.Hello,
I am trying to analyse microstructural features in one of my image. Yet I have couple of problems on the image. First of all, one of my friends has denoised the image using python and he did not share the details of denosising. When I try to denoise image by myself, I cannot get close to his denosising so I am wodering what I should do and what he used for denoising so that he got such a clear image. I have added the image before and after denosising (hope you can see the zip file).
Also another question is that I was using the thresholded image to measure microstructural features like length, width and volume fraction of yellow and chunky purple ones via imageJ and python. I am wondering if I can do the same with Matlab in a better way. I know my thresholding could be better but with limited coding skills that is what I can do currently 🙂 So next question is how I can do a better thresholding to distinguish each phases which are gray, white and black in the original image

Thank you in advance. Hello,
I am trying to analyse microstructural features in one of my image. Yet I have couple of problems on the image. First of all, one of my friends has denoised the image using python and he did not share the details of denosising. When I try to denoise image by myself, I cannot get close to his denosising so I am wodering what I should do and what he used for denoising so that he got such a clear image. I have added the image before and after denosising (hope you can see the zip file).
Also another question is that I was using the thresholded image to measure microstructural features like length, width and volume fraction of yellow and chunky purple ones via imageJ and python. I am wondering if I can do the same with Matlab in a better way. I know my thresholding could be better but with limited coding skills that is what I can do currently 🙂 So next question is how I can do a better thresholding to distinguish each phases which are gray, white and black in the original image

Thank you in advance. image analysis, image processing MATLAB Answers — New Questions

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When using the writetable function to add several different sheets, excel generates default (blank) excel sheets at the beginning of the document. I currently am working off a mac computer and thus cannot use the actxserver solutions described in other posts.

writetable(T,filename,’sheet’,’sheet_name’);When using the writetable function to add several different sheets, excel generates default (blank) excel sheets at the beginning of the document. I currently am working off a mac computer and thus cannot use the actxserver solutions described in other posts.

writetable(T,filename,’sheet’,’sheet_name’); When using the writetable function to add several different sheets, excel generates default (blank) excel sheets at the beginning of the document. I currently am working off a mac computer and thus cannot use the actxserver solutions described in other posts.

writetable(T,filename,’sheet’,’sheet_name’); writetable, excel, sheets MATLAB Answers — New Questions

​

Hi everyone;
I am going to find the saddle points of a matrix M. The question is given below…

Write a function called saddle that finds saddle points in the input matrix M. For the purposes of this problem, a saddle point is defined as an element whose value is greater than or equal to every element in its row, and less than or equal to every element in its column. Note that there may be more than one saddle point in M. Return a matrix indices that has exactly two columns. Each row of indices corresponds to one saddle point with the first element of the row containing the row index of the saddle point and the second column containing the column index. The saddle points are provided in indices in the same order they are located in M according to column-major ordering. If there is no saddle point in M, then indices is the empty array.

I am trying that code:

function indices = saddle(M)
[ rows,cols ] = size(M);
[valR,posR] = max(M,[],2);
[valC,posC] = min(M,[],1);
indices= [];
for i = 1:length(posR)
if i == posC(posR(i))
indices= [indices; i, posR(i)];
end
end
end

It is running fine. But when i test my code for

>> mat=zeros(5,3)

mat =

0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
I am getting wrong output :

saddle(mat)

ans =

1 1

the correct output must be

saddle(mat)
ans =
1 1
2 1
3 1
4 1
5 1
1 2
2 2
3 2
4 2
5 2
1 3
2 3
3 3
4 3
5 3

What i am doing wrong?? Thanks in advanceHi everyone;
I am going to find the saddle points of a matrix M. The question is given below…

Write a function called saddle that finds saddle points in the input matrix M. For the purposes of this problem, a saddle point is defined as an element whose value is greater than or equal to every element in its row, and less than or equal to every element in its column. Note that there may be more than one saddle point in M. Return a matrix indices that has exactly two columns. Each row of indices corresponds to one saddle point with the first element of the row containing the row index of the saddle point and the second column containing the column index. The saddle points are provided in indices in the same order they are located in M according to column-major ordering. If there is no saddle point in M, then indices is the empty array.

I am trying that code:

function indices = saddle(M)
[ rows,cols ] = size(M);
[valR,posR] = max(M,[],2);
[valC,posC] = min(M,[],1);
indices= [];
for i = 1:length(posR)
if i == posC(posR(i))
indices= [indices; i, posR(i)];
end
end
end

It is running fine. But when i test my code for

>> mat=zeros(5,3)

mat =

0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
I am getting wrong output :

saddle(mat)

ans =

1 1

the correct output must be

saddle(mat)
ans =
1 1
2 1
3 1
4 1
5 1
1 2
2 2
3 2
4 2
5 2
1 3
2 3
3 3
4 3
5 3

What i am doing wrong?? Thanks in advance Hi everyone;
I am going to find the saddle points of a matrix M. The question is given below…

Write a function called saddle that finds saddle points in the input matrix M. For the purposes of this problem, a saddle point is defined as an element whose value is greater than or equal to every element in its row, and less than or equal to every element in its column. Note that there may be more than one saddle point in M. Return a matrix indices that has exactly two columns. Each row of indices corresponds to one saddle point with the first element of the row containing the row index of the saddle point and the second column containing the column index. The saddle points are provided in indices in the same order they are located in M according to column-major ordering. If there is no saddle point in M, then indices is the empty array.

I am trying that code:

function indices = saddle(M)
[ rows,cols ] = size(M);
[valR,posR] = max(M,[],2);
[valC,posC] = min(M,[],1);
indices= [];
for i = 1:length(posR)
if i == posC(posR(i))
indices= [indices; i, posR(i)];
end
end
end

It is running fine. But when i test my code for

>> mat=zeros(5,3)

mat =

0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
I am getting wrong output :

saddle(mat)

ans =

1 1

the correct output must be

saddle(mat)
ans =
1 1
2 1
3 1
4 1
5 1
1 2
2 2
3 2
4 2
5 2
1 3
2 3
3 3
4 3
5 3

What i am doing wrong?? Thanks in advance order, matrix, homework MATLAB Answers — New Questions

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% This is my current code. I am attempting to use inverse kinematics to
% plot the same semicircle i made using forward kinematics. My issue is
% that the function i am currently using doesn’t properly calculate the
% "joint2" angle (it prints the same value always)

% NOTE: the error i am having occurs mostly in STEP 4 of my code.

clear;
clc;

% Step one: Defining linked robot and confirming it is correct
L_1(1) = Link([0 199.07 0 pi/2]);
L_1(2) = Link([0 -27 -23.33 -pi/2]);
L_1(3) = Link([0 -12.18 0 0]);
L_1(4) = Link([0 0 0 -pi/2]);
L_1(5) = Link([0 0 107.92 0]);
L_1(6) = Link([0 0 0 0]);
L_1(7) = Link([0 0 133.99 0]);

robot1 = SerialLink(L_1);

figure(2);

robot1.plot([pi/2 0 pi/2 0 0.6542 1.36 0], ‘nojoints’);
hold on;
% Success

% ——————————————————————— %

% Step two: retrieving end effector coordinates and confirming thier
% position
coor = robot1.fkine([pi/2 0 pi/2 0 0.6542 1.36 0]);
xF = coor.t(1);
yF = coor.t(2);
zF = coor.t(3);
% disp([‘(‘, num2str(xF), ‘ , ‘, num2str(yF) , ‘ , ‘ num2str(zF), ‘)’]);
% plot3(xF,yF,zF, ‘o’, ‘Color’, ‘g’);
% Success

% ——————————————————————— %

% Step three: plotting a semicircle

radius_S3 = 200;
pointsNum = ( pi/(pi/16) + 1);
semiCircleArray = zeros(pointsNum, 3);

index = 1;
for theta = pi : -pi/16 : 0
xF = radius_S3 * cos(theta);
yF = -23.33;
zF = radius_S3 * sin(theta);
plot3(xF,yF,zF, ‘*’, ‘Color’, ‘r’);
% disp([‘(‘, num2str(xForward), ‘ , ‘, num2str(yForward) , ‘ , ‘ num2str(zForward), ‘)’]);

semiCircleArray(index, 🙂 = [xF, yF, zF];
index = index + 1;

end

plot3(semiCircleArray(:, 1), semiCircleArray(:, 2), semiCircleArray(:, 3), ‘o’, ‘Color’, ‘b’);

% Success

% ——————————————————————— %

% Step four: inserting array values into function to confirm angles.

joint1 = zeros(pointsNum, 1);
joint2 = zeros(pointsNum, 1);
for i = 1:pointsNum
[joint1(i), joint2(i)] = theta2Output(semiCircleArray(i, 3), semiCircleArray(i, 1));
disp([‘j1: ‘, num2str(joint1(i)), ‘ , j2: ‘, num2str(joint2(i))]);

end

% This is where something goes wrong, which confirms there is an issue
% with my function. The value of one joint angle slowly increments
% whilst the other stays unchanged.

title(‘Right Leg – J1 J2 J3’);
xlabel(‘x-axis’);
ylabel(‘y-axis’);
zlabel(‘z-axis’);

function [joint1 , joint2] = theta2Output(x, z)
l1 = 107.92;
l2 = 133.99;
x = x(:);
z = z(:);
term1 = x.^2;
term2 = z.^2;
term3 = l1^2;
term4 = l2^2;

cos_joint2 = (term1 + term2 – term3 – term4) / (2 * l2 * l1);
joint2 = acos(cos_joint2);

joint1 = atan2(x , z) – atan2((l2 * sin(joint2)) , (l1 + (l2*cos(joint2))));

end% This is my current code. I am attempting to use inverse kinematics to
% plot the same semicircle i made using forward kinematics. My issue is
% that the function i am currently using doesn’t properly calculate the
% "joint2" angle (it prints the same value always)

% NOTE: the error i am having occurs mostly in STEP 4 of my code.

clear;
clc;

% Step one: Defining linked robot and confirming it is correct
L_1(1) = Link([0 199.07 0 pi/2]);
L_1(2) = Link([0 -27 -23.33 -pi/2]);
L_1(3) = Link([0 -12.18 0 0]);
L_1(4) = Link([0 0 0 -pi/2]);
L_1(5) = Link([0 0 107.92 0]);
L_1(6) = Link([0 0 0 0]);
L_1(7) = Link([0 0 133.99 0]);

robot1 = SerialLink(L_1);

figure(2);

robot1.plot([pi/2 0 pi/2 0 0.6542 1.36 0], ‘nojoints’);
hold on;
% Success

% ——————————————————————— %

% Step two: retrieving end effector coordinates and confirming thier
% position
coor = robot1.fkine([pi/2 0 pi/2 0 0.6542 1.36 0]);
xF = coor.t(1);
yF = coor.t(2);
zF = coor.t(3);
% disp([‘(‘, num2str(xF), ‘ , ‘, num2str(yF) , ‘ , ‘ num2str(zF), ‘)’]);
% plot3(xF,yF,zF, ‘o’, ‘Color’, ‘g’);
% Success

% ——————————————————————— %

% Step three: plotting a semicircle

radius_S3 = 200;
pointsNum = ( pi/(pi/16) + 1);
semiCircleArray = zeros(pointsNum, 3);

index = 1;
for theta = pi : -pi/16 : 0
xF = radius_S3 * cos(theta);
yF = -23.33;
zF = radius_S3 * sin(theta);
plot3(xF,yF,zF, ‘*’, ‘Color’, ‘r’);
% disp([‘(‘, num2str(xForward), ‘ , ‘, num2str(yForward) , ‘ , ‘ num2str(zForward), ‘)’]);

semiCircleArray(index, 🙂 = [xF, yF, zF];
index = index + 1;

end

plot3(semiCircleArray(:, 1), semiCircleArray(:, 2), semiCircleArray(:, 3), ‘o’, ‘Color’, ‘b’);

% Success

% ——————————————————————— %

% Step four: inserting array values into function to confirm angles.

joint1 = zeros(pointsNum, 1);
joint2 = zeros(pointsNum, 1);
for i = 1:pointsNum
[joint1(i), joint2(i)] = theta2Output(semiCircleArray(i, 3), semiCircleArray(i, 1));
disp([‘j1: ‘, num2str(joint1(i)), ‘ , j2: ‘, num2str(joint2(i))]);

end

% This is where something goes wrong, which confirms there is an issue
% with my function. The value of one joint angle slowly increments
% whilst the other stays unchanged.

title(‘Right Leg – J1 J2 J3’);
xlabel(‘x-axis’);
ylabel(‘y-axis’);
zlabel(‘z-axis’);

function [joint1 , joint2] = theta2Output(x, z)
l1 = 107.92;
l2 = 133.99;
x = x(:);
z = z(:);
term1 = x.^2;
term2 = z.^2;
term3 = l1^2;
term4 = l2^2;

cos_joint2 = (term1 + term2 – term3 – term4) / (2 * l2 * l1);
joint2 = acos(cos_joint2);

joint1 = atan2(x , z) – atan2((l2 * sin(joint2)) , (l1 + (l2*cos(joint2))));

end % This is my current code. I am attempting to use inverse kinematics to
% plot the same semicircle i made using forward kinematics. My issue is
% that the function i am currently using doesn’t properly calculate the
% "joint2" angle (it prints the same value always)

% NOTE: the error i am having occurs mostly in STEP 4 of my code.

clear;
clc;

% Step one: Defining linked robot and confirming it is correct
L_1(1) = Link([0 199.07 0 pi/2]);
L_1(2) = Link([0 -27 -23.33 -pi/2]);
L_1(3) = Link([0 -12.18 0 0]);
L_1(4) = Link([0 0 0 -pi/2]);
L_1(5) = Link([0 0 107.92 0]);
L_1(6) = Link([0 0 0 0]);
L_1(7) = Link([0 0 133.99 0]);

robot1 = SerialLink(L_1);

figure(2);

robot1.plot([pi/2 0 pi/2 0 0.6542 1.36 0], ‘nojoints’);
hold on;
% Success

% ——————————————————————— %

% Step two: retrieving end effector coordinates and confirming thier
% position
coor = robot1.fkine([pi/2 0 pi/2 0 0.6542 1.36 0]);
xF = coor.t(1);
yF = coor.t(2);
zF = coor.t(3);
% disp([‘(‘, num2str(xF), ‘ , ‘, num2str(yF) , ‘ , ‘ num2str(zF), ‘)’]);
% plot3(xF,yF,zF, ‘o’, ‘Color’, ‘g’);
% Success

% ——————————————————————— %

% Step three: plotting a semicircle

radius_S3 = 200;
pointsNum = ( pi/(pi/16) + 1);
semiCircleArray = zeros(pointsNum, 3);

index = 1;
for theta = pi : -pi/16 : 0
xF = radius_S3 * cos(theta);
yF = -23.33;
zF = radius_S3 * sin(theta);
plot3(xF,yF,zF, ‘*’, ‘Color’, ‘r’);
% disp([‘(‘, num2str(xForward), ‘ , ‘, num2str(yForward) , ‘ , ‘ num2str(zForward), ‘)’]);

semiCircleArray(index, 🙂 = [xF, yF, zF];
index = index + 1;

end

plot3(semiCircleArray(:, 1), semiCircleArray(:, 2), semiCircleArray(:, 3), ‘o’, ‘Color’, ‘b’);

% Success

% ——————————————————————— %

% Step four: inserting array values into function to confirm angles.

joint1 = zeros(pointsNum, 1);
joint2 = zeros(pointsNum, 1);
for i = 1:pointsNum
[joint1(i), joint2(i)] = theta2Output(semiCircleArray(i, 3), semiCircleArray(i, 1));
disp([‘j1: ‘, num2str(joint1(i)), ‘ , j2: ‘, num2str(joint2(i))]);

end

% This is where something goes wrong, which confirms there is an issue
% with my function. The value of one joint angle slowly increments
% whilst the other stays unchanged.

title(‘Right Leg – J1 J2 J3’);
xlabel(‘x-axis’);
ylabel(‘y-axis’);
zlabel(‘z-axis’);

function [joint1 , joint2] = theta2Output(x, z)
l1 = 107.92;
l2 = 133.99;
x = x(:);
z = z(:);
term1 = x.^2;
term2 = z.^2;
term3 = l1^2;
term4 = l2^2;

cos_joint2 = (term1 + term2 – term3 – term4) / (2 * l2 * l1);
joint2 = acos(cos_joint2);

joint1 = atan2(x , z) – atan2((l2 * sin(joint2)) , (l1 + (l2*cos(joint2))));

end inverse kinematics, serial robot MATLAB Answers — New Questions

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We have the same issue as https://www.mathworks.com/matlabcentral/answers/2128851-why-is-the-mathworks-service-host-causing-issues-with-my-cluster-and-or-hpc and I see there that "For R2024a and newer, regardless of your licensing, the MathWorks Service Host is required"
When running in a cluster, this process is repeated every time MATLAB is started on a new node.
This not only causes uneccessary delays but it also piles up lots of data on the users’ HOME space.
If we have 300 nodes, at ~640MB per node under $HOME/.MathWorks/ServiceHost a user would require more than 180GB just to host this data. This makes version 2024 not suitable for cluster environments.

How do we fix this issue?We have the same issue as https://www.mathworks.com/matlabcentral/answers/2128851-why-is-the-mathworks-service-host-causing-issues-with-my-cluster-and-or-hpc and I see there that "For R2024a and newer, regardless of your licensing, the MathWorks Service Host is required"
When running in a cluster, this process is repeated every time MATLAB is started on a new node.
This not only causes uneccessary delays but it also piles up lots of data on the users’ HOME space.
If we have 300 nodes, at ~640MB per node under $HOME/.MathWorks/ServiceHost a user would require more than 180GB just to host this data. This makes version 2024 not suitable for cluster environments.

How do we fix this issue? We have the same issue as https://www.mathworks.com/matlabcentral/answers/2128851-why-is-the-mathworks-service-host-causing-issues-with-my-cluster-and-or-hpc and I see there that "For R2024a and newer, regardless of your licensing, the MathWorks Service Host is required"
When running in a cluster, this process is repeated every time MATLAB is started on a new node.
This not only causes uneccessary delays but it also piles up lots of data on the users’ HOME space.
If we have 300 nodes, at ~640MB per node under $HOME/.MathWorks/ServiceHost a user would require more than 180GB just to host this data. This makes version 2024 not suitable for cluster environments.

How do we fix this issue? mathworks service host cluster hpc MATLAB Answers — New Questions

​

I have a C++ code that I have compiled in Visual Studio 2022 as a DLL. I use MATLAB to call the DLL using the function loadlibrary. The code executes no problem. However, I want to enter the Visual Studio debugger to step through the code once MATLAB calls the DLL. Years ago in a previous version of Visual Studio and MATLAB, a friend showed me how to connect Visual Studio to MATLAB. In Visual Studio, I would select "Build->Attach to process" and pick the MATLAB process that would appear in the window. Then, I could add a breakpoint in the C code, and when MATLAB called the DLL, the Visual Studio debugger would stop code execution at the break point and let me step through the code. I’m unable to do that now for some reason. When I attach MATLAB to Visual Studio, the breakpoint turns to an empty red outline circle with a caution triangle on it. When I hover over it, the tooltip says "The breakpoint will not currently be hit. No symbols have been loaded for this document." The Symbol Status column of the Debug->Windows->Modules dialog says "Cannot find or open the PDB file." I’m unsure what to do here. I’m sure I’m just forgetting a step that I was shown years back. Any help would be appreciated. Note Visual Studio did create a pdb file along with the DLL and both are in the same directory. Also, I compiled in debug mode, not release mode.I have a C++ code that I have compiled in Visual Studio 2022 as a DLL. I use MATLAB to call the DLL using the function loadlibrary. The code executes no problem. However, I want to enter the Visual Studio debugger to step through the code once MATLAB calls the DLL. Years ago in a previous version of Visual Studio and MATLAB, a friend showed me how to connect Visual Studio to MATLAB. In Visual Studio, I would select "Build->Attach to process" and pick the MATLAB process that would appear in the window. Then, I could add a breakpoint in the C code, and when MATLAB called the DLL, the Visual Studio debugger would stop code execution at the break point and let me step through the code. I’m unable to do that now for some reason. When I attach MATLAB to Visual Studio, the breakpoint turns to an empty red outline circle with a caution triangle on it. When I hover over it, the tooltip says "The breakpoint will not currently be hit. No symbols have been loaded for this document." The Symbol Status column of the Debug->Windows->Modules dialog says "Cannot find or open the PDB file." I’m unsure what to do here. I’m sure I’m just forgetting a step that I was shown years back. Any help would be appreciated. Note Visual Studio did create a pdb file along with the DLL and both are in the same directory. Also, I compiled in debug mode, not release mode. I have a C++ code that I have compiled in Visual Studio 2022 as a DLL. I use MATLAB to call the DLL using the function loadlibrary. The code executes no problem. However, I want to enter the Visual Studio debugger to step through the code once MATLAB calls the DLL. Years ago in a previous version of Visual Studio and MATLAB, a friend showed me how to connect Visual Studio to MATLAB. In Visual Studio, I would select "Build->Attach to process" and pick the MATLAB process that would appear in the window. Then, I could add a breakpoint in the C code, and when MATLAB called the DLL, the Visual Studio debugger would stop code execution at the break point and let me step through the code. I’m unable to do that now for some reason. When I attach MATLAB to Visual Studio, the breakpoint turns to an empty red outline circle with a caution triangle on it. When I hover over it, the tooltip says "The breakpoint will not currently be hit. No symbols have been loaded for this document." The Symbol Status column of the Debug->Windows->Modules dialog says "Cannot find or open the PDB file." I’m unsure what to do here. I’m sure I’m just forgetting a step that I was shown years back. Any help would be appreciated. Note Visual Studio did create a pdb file along with the DLL and both are in the same directory. Also, I compiled in debug mode, not release mode. dll, visual-studio, debug, loadlibrary MATLAB Answers — New Questions

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