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cui,xingxing
最後のアクティビティ: 2025 年 3 月 29 日 9:25

MATLAB 轻易复现知乎3D瀑布图

看到知乎有用Origin软件绘制3D瀑布图，觉得挺美观的，突然也想用MATLAB复现一样的图，借助ChatGPT,很容易写出代码，相对Origin软件，无需手动干预调整图像属性，代码控制性强：

%% 清理环境

close all; clear; clc;

%% 模拟时间序列

t = linspace(0,12,200); % 时间从 0 到 12，分 200 个点

% 下面构造一些模拟的"峰状"数据，用于演示

% 你可以根据需要替换成自己的真实数据

rng(0); % 固定随机种子，方便复现

baseIntensity = -20; % 强度基线（z 轴的最低值）

numSamples = 5; % 样本数量

yOffsets = linspace(20,140,numSamples); % 不同样本在 y 轴上的偏移

colors = [ ...

0.8 0.2 0.2; % 红

0.2 0.8 0.2; % 绿

0.2 0.2 0.8; % 蓝

0.9 0.7 0.2; % 金黄

0.6 0.4 0.7]; % 紫

% 构造一些带多个峰的模拟数据

dataMatrix = zeros(numSamples, length(t));

for i = 1:numSamples

% 随机峰参数

peakPositions = randperm(length(t),3); % 三个峰位置

intensities = zeros(size(t));

for pk = 1:3

center = peakPositions(pk);

width = 10 + 10*rand; % 峰宽

height = 100 + 50*rand; % 峰高

% 高斯峰

intensities = intensities + height*exp(-((1:length(t))-center).^2/(2*width^2));

end

% 再加一些小随机扰动

intensities = intensities + 10*randn(size(t));

dataMatrix(i,:) = intensities;

end

%% 开始绘图

figure('Color','w','Position',[100 100 800 600],'Theme','light');

hold on; box on; grid on;

for i = 1:numSamples

% 构造 fill3 的多边形顶点

xPatch = [t, fliplr(t)];

yPatch = [yOffsets(i)*ones(size(t)), fliplr(yOffsets(i)*ones(size(t)))];

zPatch = [dataMatrix(i,:), baseIntensity*ones(size(t))];

% 使用 fill3 填充面积

hFill = fill3(xPatch, yPatch, zPatch, colors(i,:));

set(hFill,'FaceAlpha',0.8,'EdgeColor','none'); % 调整透明度、去除边框

% 在每条曲线尾部标注 Sample i

text(t(end)+0.3, yOffsets(i), dataMatrix(i,end), ...

['Sample ' num2str(i)], 'FontSize',10, ...

'HorizontalAlignment','left','VerticalAlignment','middle');

end

%% 坐标轴与视角设置

xlim([0 12]);

ylim([0 160]);

zlim([-20 350]);

xlabel('Time (sec)','FontWeight','bold');

ylabel('Frequency (Hz)','FontWeight','bold');

zlabel('Intensity','FontWeight','bold');

% 设置刻度（根据需要微调）

set(gca,'XTick',0:2:12, ...

'YTick',0:40:160, ...

'ZTick',-20:40:200);

% 设置视角（az = 水平旋转，el = 垂直旋转）

view([211 21]);

% 让三维坐标轴在后方

set(gca,'Projection','perspective');

% 如果想去掉默认的坐标轴线，也可以尝试

% set(gca,'BoxStyle','full','LineWidth',1.2);

%% 可选：在后方添加一个浅色网格平面 (示例)

% 这个与题图右上方的网格类似

[Xplane,Yplane] = meshgrid([0 12],[0 160]);

Zplane = baseIntensity*ones(size(Xplane)); % 在 Z = -20 处画一个竖直面的框

surf(Xplane, Yplane, Zplane, ...

'FaceColor',[0.95 0.95 0.9], ...

'EdgeColor','k','FaceAlpha',0.3);

%% 进一步美化（可根据需求调整）

title('3D Stacked Plot Example','FontSize',12);

constantplane("x",12,FaceColor=rand(1,3),FaceAlpha=0.5);

constantplane("y",0,FaceColor=rand(1,3),FaceAlpha=0.5);

constantplane("z",-19,FaceColor=rand(1,3),FaceAlpha=0.5);

hold off;

Have fun! Enjoy yourself!

https://www.mathworks.com/academia/students/competitions/student-challenge/ai-challenge.html

David
最後のアクティビティ: 2025 年 3 月 24 日 18:47

First MathWorks AI Challenge! 🎉

We are excited to announce the first edition of the MathWorks AI Challenge. You’re invited to submit innovative solutions to challenges in the field of artificial intelligence. Choose a project from our curated list and submit your solution for a chance to win up to $1,000 (USD). Showcase your creativity and contribute to the advancement of AI technology.

Javier
最後のアクティビティ: 2025 年 3 月 19 日 19:03

Problem 859. Get the elements of diagonal and antidiagonal for any m-by-n matrix

I've been trying this problem a lot of time and i don't understand why my solution doesnt't work.

In 4 tests i get the error Assertion failed but when i run the code myself i get the diag and antidiag correctly.

function [diag_elements, antidg_elements] = your_fcn_name(x)
    [m, n] = size(x);
    
    % Inicializar los vectores de la diagonal y la anti-diagonal
    diag_elements = zeros(1, min(m, n));
    antidg_elements = zeros(1, min(m, n));
    
    % Extraer los elementos de la diagonal
    for i = 1:min(m, n)
        diag_elements(i) = x(i, i);
    end
    
    % Extraer los elementos de la anti-diagonal
    for i = 1:min(m, n)
        antidg_elements(i) = x(m-i+1, i);
    end
end

cody

Image Analyst
最後のアクティビティ: 2025 年 2 月 19 日

Snow where you live - love it or hate it?

I love it all

45%

Love the first snowfall only

15%

Hate it

17.5%

It doesn't snow where I live

22.5%

40 票

imad
最後のアクティビティ: 2025 年 2 月 14 日

The Future of Simulink in MATLAB

Simulink has been an essential tool for modeling and simulating dynamic systems in MATLAB. With the continuous advancements in AI, automation, and real-time simulation, I’m curious about what the future holds for Simulink.

What improvements or new features do you think Simulink will have in the coming years? Will AI-driven modeling, cloud-based simulation, or improved hardware integration shape the next generation of Simulink?

How to run local DeepSeek models and use them with MATLAB » The MATLAB Blog - MATLAB & Simulink

Mike Croucher
最後のアクティビティ: 2025 年 2 月 4 日

Run DeepSeek models on your own machine and interact with them using MATLAB

You've probably heard about the DeepSeek AI models by now. Did you know you can run them on your own machine (assuming its powerful enough) and interact with them on MATLAB?

In my latest blog post, I install and run one of the smaller models and start playing with it using MATLAB.

Larger models wouldn't be any different to use assuming you have a big enough machine...and for the largest models you'll need a HUGE machine!

Even tiny models, like the 1.5 billion parameter one I demonstrate in the blog post, can be used to demonstrate and teach things about LLM-based technologies.

Have a play. Let me know what you think.

Brent
最後のアクティビティ: 2025 年 2 月 18 日

Problem 723: QWERTY Shift Encoder

My following code works running Matlab 2024b for all test cases. However, 3 of 7 tests fail (#1, #4, & #5) the QWERTY Shift Encoder problem. Any ideas what I am missing?

Thanks in advance.

keyboardMap1 = {'qwertyuiop[;'; 'asdfghjkl;'; 'zxcvbnm,'};

keyboardMap2 = {'QWERTYUIOP{'; 'ASDFGHJKL:'; 'ZXCVBNM<'};

if length(s) == 0

se = s;

end

for i = 1:length(s)

if double(s(i)) >= 65 && s(i) <= 90

row = 1;

col = 1;

while ~strcmp(s(i), keyboardMap2{row}(col))

if col < length(keyboardMap2{row})

col = col + 1;

else

row = row + 1;

col = 1;

end

se(i) = keyboardMap2{row}(col + 1);

elseif double(s(i)) >= 97 && s(i) <= 122

row = 1;

col = 1;

while ~strcmp(s(i), keyboardMap1{row}(col))

if col < length(keyboardMap1{row})

col = col + 1;

else

row = row + 1;

col = 1;

end

se(i) = keyboardMap1{row}(col + 1);

else

se(i) = s(i);

end

% if ~(s(i) = 65 && s(i) <= 90) && ~(s(i) >= 97 && s(i) <= 122)

% se(i) = s(i);

% end

end

Audace NSHIMIRIMANA
最後のアクティビティ: 2024 年 12 月 10 日

Improvement of Energy Management Strategy (EMS) of Plug In Hybrid Electric Vehicles (PHEV) Using Rule-based Control Strategy and Signal Processing / ITS

Watt's Up with Electric Vehicles?EV modeling Ecosystem (Eco-friendly Vehicles), V2V Communication and V2I communications thereby emitting zero Emissions to considerably reduce NOx ,Particulates matters,CO2 given that Combustion is always incomplete and will always be.

Reduction of gas emissions outside to the environment will improve human life span ,few epidemic diseases and will result in long life standard

Frédéric
最後のアクティビティ: 2024 年 11 月 22 日

Colors to differenciate input, output and intermediate signals

Is it possible to differenciate the input, output and in-between wires by colors?

Bob
最後のアクティビティ: 2024 年 12 月 4 日

AI Chat playground accuracy metrics

I was curious to startup your new AI Chat playground.

The first screen that popped up made the statement:

"Please keep in mind that AI sometimes writes code and text that seems accurate, but isnt"

Can someone elaborate on what exactly this means with respect to your AI Chat playground integration with the Matlab tools?

Are there any accuracy metrics for this integration?

https://www.youtube.com/watch?v=wjZofJX0v4M

David
最後のアクティビティ: 2024 年 10 月 29 日

The best high-level introduction to LLM's and Transformers I've seen

Watch episodes 5-7 for the new stuff, but the whole series is really great.

saket singh
最後のアクティビティ: 2024 年 10 月 13 日

Tools Opinion

hello i found the following tools helpful to write matlab programs. copilot.microsoft.com chatgpt.com/gpts gemini.google.com and ai.meta.com. thanks a lot and best wishes.

https://blogs.mathworks.com/deep-learning/2024/07/09/local-llms-with-matlab/

David
最後のアクティビティ: 2024 年 9 月 18 日

Did you know you can use Local LLMs with MATLAB?

Local large language models (LLMs), such as llama, phi3, and mistral, are now available in the Large Language Models (LLMs) with MATLAB repository through Ollama™!

Read about it here:

local-llm

goc3
最後のアクティビティ: 2024 年 12 月 3 日

Congratulations to William!

I was browsing the MathWorks website and decided to check the Cody leaderboard. To my surprise, William has now solved 5,000 problems. At the moment, there are 5,227 problems on Cody, so William has solved over 95%. The next competitor is over 500 problems behind. His score is also clearly the highest, approaching 60,000.

Please take a moment to congratulate @William.

J.K043006
最後のアクティビティ: 2024 年 8 月 29 日

"corr" malfunctioning in cody

I've been working on some matrix problems recently(Problem 55225)

and this is my code

It turns out that "Undefined function 'corr' for input arguments of type 'double'." However, should't the input argument of "corr" be column vectors with single/double values? What's even going on there?

David
最後のアクティビティ: 2024 年 8 月 8 日

Visual PDE

A library of runnable PDEs. See the equations! Modify the parameters! Visualize the resulting system in your browser! Convenient, fast, and instructive.

Visit https://visualpde.com/explore.html

supercomputers
最後のアクティビティ: 2024 年 11 月 6 日

writing matlab code using llm

hello i found the following tools helpful to write matlab programs. copilot.microsoft.com chatgpt.com/gpts gemini.google.com and ai.meta.com. thanks a lot and best wishes.

Athanasios Paraskevopoulos
最後のアクティビティ: 2024 年 7 月 31 日

Looking for Beginner Courses on Drone Programming

Hi everyone,

I've recently joined a forest protection team in Greece, where we use drones for various tasks. This has sparked my interest in drone programming, and I'd like to learn more about it. Can anyone recommend any beginner-friendly courses or programs that teach drone programming?

I'm particularly interested in courses that focus on practical applications and might align with the work we do in forest protection. Any suggestions or guidance would be greatly appreciated!

Thank you!

Muhammad
最後のアクティビティ: 2024 年 8 月 26 日

What do you like most about MATLAB?

"What are your favorite features or functionalities in MATLAB, and how have they positively impacted your projects or research? Any tips or tricks to share?