結果:
Dear all,
I would like to know if "Ridge regularization, i.e., L2" is applicable to the LSBoost regression model or not. After searching the MATLAB documentation, I found code only for "Lasso (L1) regularization."
For example:
t = templateTree(Reproducible=true);
bag = fitrensemble(X,Y,Method="Bag",NumLearningCycles=300,Learners=t);
bag = regularize(bag,Lambda=[0.001 0.1],Verbose=1);
Best regards,
Hello, I have applied the "sobel" edge detection function. However, I am not sure how to segment and single out only the cells that contain the " cross" shape inside of them. These are the cells infected by Babesisos, while the rest are not infected.
Thanks !
Hello everyone,
I am trying to simulate the trajectory of a two-stage rocket in Simulink. I am using the 'Custom Variable Mass 6DOF ECEF (Quaternion) Equation of Motion'. I would like to use a PID controller to control the pitch angle of the rocket (note, pitch angle is the output). The issue is that the above Equation of Motion is non-linear. Is there a way to linearize this EOM for the entire trajectory? the system is time dependent ( as the mass, velocity and trajectory changes with time).
link of the EoM:
https://nl.mathworks.com/help/aeroblks/customvariablemass6dofecefquaternion.html
hi
I have a problem when offline installing the support packages for the zynq on matlab r2019a.
I obtain the following error message:
"Support Software Installer Error
System does not have the required MATLAB version to start the support package installation."
I tried different versions, uninstall/re-install matlab, different ways for installing this package and it does not work
Do you have any suggestions
Just in two weeks, we already have 300 entries and 2,000 votes! We are so impressed by your creative styles, artistic talents, and ingenious programming techniques.
Now, it’s time to announce the weekly winners!
Mini Hack Winners - Week 2
Time & Space:
Trees:
Cartoon:
Symbolism:
Realism:
Fractal:
Multi-Entry Stories:
Explanatory:
Light:
MATtropolis:
Congratulations! Each of you won your choice of a T-shirt, a hat, or a coffee mug. We will contact you after the contest ends.
New categories for Week 3!
- 40: MathWorks will celebrate its 40th Anniversary in 2024. You will have opportunities to win special prizes!
- Most creative remix
Categories we’d love to see more entries in
- Multi-Entry Stories (e.g. Jr’s Matzilla series)
- MATropolis
- Math/Physics Explanation
Finally, just a reminder that you have a direct impact on the next generation of animation tools in MATLAB! Don’t forget to share your thoughts and ideas with us.
I'm getting an error error "using tall/cellfun" while doing a project listed in mathworks "Denoise Speech Using Deep Learning Networks". I don't know how to fix this error pr why this error occured in the first place. Seeking explanation for this particuar error. If you know anuthing about it then please consider helping me below this post.
Hello, all!
This is my first post after just joining this discussion, so please forgive me and provide kind assistance if I have posted to the wrong subsection!
I have a good interest in learning sql server course and right now I am taking help from various platforms like https://www.coursera.org/ https://www.udemy.com/
Also I have a doubt that is it a good option to learn from platforms like this or I should go for some sql server online training . I have searched for the solution of my queries in various above platforms which helped me up to some extent only as it was not directly given by any expert or trainer.
Hoping in getting a quick response
Thankyou in advance.
Hello, I am a student and I am working on a neural network for a line follower car and I would like you to recommend a tutorial to implement it in simulink.
Hello, everyone.
I have got the x,y,z coordinates and MagE for a radiation pattern. But when I want to plot it in spherical coordinates using 'patternCustom' function, I found the pattern is incomplete.
I attaced the data and script here. Can someone help me?
Hello everyone !!!!
I try to develop a test bench for cybersecurity in micro grids (Generations, Breakers,...) . I plan to simulate my grid on Simpower. I have a simulated PLC in a VM and a real RTAC. I would like to establish bidirectional communication between my grid simulated on Simpower and the physical RTAC (or the simulated PLC on VM). The RTAC is connected to a SCADA system which should be able to send commands to the grid (Simpower).
RTAC, Simpower, and the SCADA system are located on separate machines.
Any approach to establish a connection between Simpower and the RTAC (or PLC)?
Thanks !!!
Dear contest participants,
Happy Friday! I am thrilled to share some exciting news with you. Cleve Moler, the father of MATLAB, has just published a captivating blog post dedicated to our outstanding Flipbook Mini Hack contest!
In his blog post, Cleve expresses his genuine admiration for the multitude of creative styles, artistic talents, and ingenious programming techniques that have been showcased throughout the contest. What's even more remarkable is that he handpicked some of his personal favorites! You don't want to miss this opportunity to see what Cleve has to say.
But that's not all! Your exceptional animations have sparked immense interest among the MathWorks teams. This means you have a direct impact on the next generation of animation tools in MATLAB! We value your thoughts and ideas, so please don't hesitate to share them with us.
Let's keep up the phenomenal work in the remaining two weeks, and together, we'll continue to push the boundaries of creativity and innovation.
Wishing you all an incredible weekend ahead!
Enthusiastically yours,
Chen
I think it would be a really great feature to be able to add an Alpha property to the basic "Line" class in MATLAB plots. I know that I have previously had to resort to using Patch to be able to plot semitransparent lines, but there are also so many other functions that rely on the "Line" class.
For example, if you want to make a scatter plot from a table with things specified into groups, you can use ScatterHistogram or gscatter but since gscatter uses the Line class, you can't adjust the marker transparency. So if you don't want the histograms, you are stuck with manually separating it and using scatter with hold on.
Hello! I'm currently working on a heat transfer problem, I don't consider myself to be an expert, therefore I'm still learning how to use this tool.
Here's the thing: I have pretty much everything working, but there's an issue. The ELSE equation is not giving any results and I don't know exactly why. I would appreciate if someone would be interested in helping me learn about this because I'm at a loss righ now
%% Parámetros geométricos del dominio
A=3; %Anchura (en metros)
H=2.5; %Altura (en metros)
Nx= 7; %Número de nodos en la dirección x
Ny=6; %Número de nodos en la dirección y
dx=A/(Nx-1); %Distancia de elemento finito en dirección x (metros)
dy=H/(Ny-1); %Distancia de elemento finito en direccion y (metros)
%% Condiciones iniciales y de frontera
To=1000; %Temperatura interna del horno (en C)
T = ones(Nx,Ny);
Tinf=20; %Temperatura externa (en C)
ho=100; %Coeficiente de transferencia convectiva interior (en W/m^2K)
hinf=10; %Coeficiente de transferencia convectiva exterior (en W/m^2K)
q_dot=8000; %Calor generado por unidad volumétrica
K=1; %Conductividad del material (en W/mK)
epsilon=1e-5;
Error=5;
%% Computación
iter=0;
while (Error>epsilon)
iter=iter+1;
disp(iter);
Told=T;
for j=1:Ny
for i=1:Nx
if i==Nx
for j=2:Ny-1
T(i,j)=(2*T(i-1,j)+T(i,j-1)+T(i,j+1)+(q_dot*dx^2)/K)/4;
end
for j=Ny
T(i,j)=T(i,j-1)+T(i-1,j)+(q_dot*dx^2)/(2*K)+(hinf*dx*Tinf)/K;
end
for j=1
T(i,j)=((q_dot*dx^2)/(2*K)+T(i-1,j)+T(i,j+1));
end
elseif i==1
for j=Ny*4/6:Ny-1
T(i,j)=(2*T(i+1,j)+T(i,j-1)+T(i,j+1)+(q_dot*dx^2)/K)/4;
end
for j=Ny*0.5
T(i,j)=T(i,j+1)+T(i+1,j)+(q_dot*dx^2)/(2*K)+(hinf*dx*Tinf)/K;
end
for j=Ny
T(i,j)=T(i,j-1)+T(i+1,j)+(q_dot*dx^2)/(2*K)+(ho*dx*To)/K;
end
elseif i>1 && i<Nx
for j=Ny
T(i,j)=(T(i-1,j)+T(i+1,j)+2*T(i,j-1)+(q_dot*dx^2)/K+(2*hinf*dx*Tinf)/K)/(4+2*hinf*dx/K);
end
elseif 2<i && i<Nx*3/7
for j=Ny*0.5
T(i,j)=((T(i-1,j)+T(i+1,j)+2*T(i,j+1)+(q_dot*dx^2)/K)+(2*ho*dx*To)/K)/(4+2*hinf*dx/K);
end
elseif i==Nx*4/7
for j=2:Ny*2/6
T(i,j)=((T(i,j-1)+T(i-j+1)+2*T(i+1,j)+(q_dot*dx^2)/K)+(2*ho*dx*To)/K)/(4+2*hinf*dx/K);
end
for j=1
T(i,j)=T(i,j-1)+T(i+1,j)+(q_dot*dx^2)/(2*K)+(ho*dx*To)/K;
end
for j=Ny*0.5
T(i,j)=(T(i,j+1)+2*T(i+1,j)+2*T(i,j+1)+T(i-1,j)+(3*q_dot*dx^2)/(2*K)+(2*ho*dx*To)/K)/(6+(2*ho*dx)/K);
end
else
T(i,j)=(T(i-1,j)+T(i+1,j)+T(i,j-1)+T(i,j+1)+(q_dot*dx^2)/K)/4;
end
end
end
Error=sqrt(sumsqr(T-Told));
disp(Error);
end
T(1:3,1) = To;
T(1:3,2)=To;
%% Graficando el resultado
x=0:dx:A;
y=0:dy:H;
% Definir los límites de color para resaltar variaciones
min_temp = min(min(T)); % Obtener el valor mínimo de temperatura
max_temp = max(max(T)); % Obtener el valor máximo de temperatura
colormap(hot); % Cambiar el colormap (puedes probar otros)
contourf(x, y, T', 'LineWidth', 1); % Añadir un grosor de línea para los contornos
colorbar;
title('Distribución de Temperatura')
xlabel('Dirección en x')
ylabel('Dirección en y')
% Establecer los límites de color para resaltar variaciones
clim([min_temp, max_temp]); % Establecer los límites de color según los valores mínimos y máximos de temperatura
Matlab show me that the next problem.
Tie variable 'Pressure_Transducer_Timpano.p.v' (Voltage) to a definite value, for example by connecting an appropriate domain reference block.
I don't know what I should do in it because I have done an model by hearing and use this object because I want to modelate a Timpanumm membrane. If you could help I really gratefully.
I will include the picture.
Dedicated to all Flipbook contest lovers! :D
Hi, I'm in truble because I have two programs with the same variables and parameters. The main of the study is to change a value and plot the results. The problem is that I want them on the same plot but I use the same name for the variabes in the two different programs so when I use some function to join the figures togheter matlab resets the values obtained in the first program and runs only the second one.
Is there a method to avoid changing all the names of the variables in one of the two programs (because they have something like 500 lines)?
I saw this post on Answers.
I was impressed at the capability of the AI, as I have been at other times when I posed a question to it, at least some of the time. So much so that I wondered...
What if the AI were automatically applied to EVERY question on Answers? Would that be a good or bad thing? For example, suppose the AI automatically offers an answer to every question as soon as it gets posted? Of course, users would still be allowed to post their own, possibly better answers. But would it tend to disincentivise individuals from ansering questions?
Perhaps as bad, would it push Answers into the mode of a homework solving forum? Since if every homework question gets a possibly pretty good automatic AI generated solution, then every student will just post all HW questions, and the forum would quickly become overwhelmed.
I suppose one idea could be to set up the AI to post an answer to all un-answered questions that are at least one month old. Then students would not gain by posting their homework.
In just one week, we have about 200 amazing animations! We see many creative and compelling animations and more importantly a lot of FUN!
Now, let the voting begin! Vote on the animations you love. Also, share them with your friends, classmates, or colleagues. Show the world the beauty of mathematics!
Mini Hack Winners - Week 1
You probably can imagine how hard it is to pick the winners, given so many awesome entries there are! We came up with several categories:
Landscape:
Trees:
Illusion:
Cartoon:
MATropolis:
Geometry:
Congratulations to the winners! Each of you won your choice of a T-shirt, a hat, or a coffee mug. We will contact you after the contest ends.
Finally, we encourage all of you to share your experiences, thoughts, and feedback in our new contest discussions channel!
Loving all the animations I'm seeing so far and feeling so inspired and impressed by what y'all are sharing. Thanks for loading me up with new topics to learn about!
